soil temperature of oregons agricultural regions-

Soil Temperatureof Oregon'sAgricultural Regions-

Special Report 446November 1975

Agricultural Experiment StationOregon State University, Corvallis

SOIL TEMPERATURE OF OREGON'S AGRICULTURAL REGIONS

Compiled by Earl M. Bates

Advisory Agricultural Meteorologist

NOAA, National Weather Service Office for Agriculture

Oregon State University

In Co-operation With

The Agronomic Crop Science Department


and

The Agricultural Experimental Station


July 1975

ACKNOWLEDGEMENT

I express thanks to Professor Wheeler Calhoun for

his review and advise on this paper and for his assistance

in its assembly. Robert L. Jackson is recognized for his

large contribution in extracting and assembling data from

original soil temperature records.

CONTENTS

Page

1 Measurement Methods

2 Application of Data

Hyslop Field Laboratory, Corvallis, Oregon

5 Average Daily Max/Min Soil Temperature, 2-inch depth



8 Frequency of Occurrence, By Month, Of Max/Min Soil

Temperature at 4-inch Depth by 10-Degree Increments

10 Weekly Average Max/Min Soil Temperature, 2-inch depth



North Willamette Experiment Station, Aurora, Oregon




16 • Weekly Average Max/Min Soil Temperature, 2-inch depth

Pitchford Boys Ranch, Roseburg, Oregon


18 Frequency of Occurrence, By Month, of Max/Min Soil



Weather Service Office, Medford, Oregon


CONTENTS (CONTINUED)

Page


Temperature at 4-inch Depth By 10-Degree Increments


Central Oregon Experiment Station, Redmond, Oregon





Madres, Oregon 1 NNW





Experiment Station, Moro Site, Moro, Oregon





Weather Service Office, Klamath Falls, Oregon





Pendleton Experiment Station, Pendleton, Oregon

37 Average Monthly Max/Min Soil Temperature, 4-inch depth

SOIL TEMPERATURE OF OREGON'S

AGRICULTURAL REGIONS

1. Measurement Methods

This report is an attempt to bring all the soil temperature informa-

tion for the State of Oregon under one cover and in a form useful to farm

operators and to research crop specialists. Soil temperatures have been

systematically measured and recorded in only a few places and the period

of these records is too short at some locations to develop averages of as

good reliability as we would like.

The United States Weather Bureau organized an Agricultural Weather

Service in Oregon in 1962. In the mid-sixties, the Weather Bureau, in

co-operation with the Oregon Agricultural Experiment Station, established

many of the soil temperature stations which reported information for this

paper.

All records reported are from instruments sensors buried under bare

soil. Palmer i soil thermometers, a type that indicates maximum, minimum,

and cLrrent temperature are used. The reporting stations are located so

that one (or more) observation is made in each of the important farming

areas and in each of the climatic regions served by the Oregon Agri-

Weather Service.

There is a general practice that a station having only one soil ther-

mometer will have it placed at the 4-inch depth, and a station having two

or more soil thermometers will have one at the 4-inch depth. Four inches

equals about 10.2 centimeters and the 10-centimeters depth is a world

standard. The North Willamette Experiment Station varies from this

general rule by having soil thermometers at the 2- and 8- inch depths.

Because these soil temperature observations were established to serve

agricultural needs, an effort has been made to operate all stations at

least throughout the growing season. Records for Pitchford Boy's Ranch,

near Roseburg, Corvallis, North Willamette Experiment Station, Pendleton

Experiment Station, and Medford are for 12 months per year; all others are

essentially for the growing season of each year.

1 The trade name is used here only as descri ption of the instrumerz; this

paper does not endorse any type of scil thermometer.

The temperature of bare soil is affected by many things- Solar radia-

tion, warm air advection, and the latent heat of condensation all contribute

to warming of the soil. Cooling is accomplished by long wave radiation

from the soil at night 2 , convection, cold air adbection, evaporation, and

some other small contributors. The soil temperature is likely to be some-

what different in a crop area than when the soil surface is bare.

Soil temperature measurements under a bare surface are rather a stan-

dard operation and though they differ from field conditions, they may con-

stitute a useful tool in crop management from planting date into the semi-

mature plant stage. Particularly before and at planting time, the "stan-

dard" soil temperatures are useful because the seed bed is a bare soil

condition and its temperature is likely close to the temperature measure-

ments from a bare soil plot. Until the crop is tall enough to cause con-

siderable shade and appreciably alter air movement near the soil surface,

field soil temperature should be about the same as the "standard" soil

temperature measurement.

II. Application of Data

If a crop producer knows the average soil temperature of his region

for a period of years and knows the current day-to-day soil temperature,

he is able to determine if the current seed bed condition is typical,

cooler than average or warmer than the climatic average. This is useful

knowledge in planting and managing a crop. By means of present day ex-

tended weather forecasts, it is possible to make estimates of the trend

of the soil temperature which further refines the management capability

of the farmer when he has knowledge of the climatic average of soil tem-

perature plus current soil temperature information.

Some soil temperature conditions found to be associated with vege-

table seed germination are as follows:

2 Long wave radiation from the soil is always occurring, day and night,

but its main effect is noticed at night.

MINIMUM OPTIMUM OPTIMUM

Page 3

MAXIMUM

CROP °F RANGE °F&F °F

Asparagus 50 60-85 75 95

Bean 60 60-85 80 95

Bean,Lima 60 65-85 85 85

Beet 40 50-85 85 95

Cabbage 40 45-95 85 100

Carrot 40 45-85 80 95

Cauliflower 40 45-85 80 100

Corn 50 60-95 95 105

Cucumber 60 60-95 95 105

Lettuce 35 40-80 75 85

Muskmelon 60 75-95 90 100

Onion 35 50-95 75 95

Parsley 40 50-85 75 90

Pea 40 40-75 75 85

Pumpkin 60 70-90 95 100

Spinach 35 45-75 70 85

Squash 60 70-95 95 100

Tomato 50 60-85 85 95

Turnip 40 60-105 85 105

Watermelon 60 70-95 95 105

Values of this table are from the Handbook for Vegetable Growers by

J. E. Knott.

Soil temperature also influences the movement of moisture in the

soil and the rate of evaporative water loss from the soil. Knowledge of

climatic averages of soil temperature and of current soil temperature

should be a useful tool in the design and operation of an irrigation

system.

At harvest time, soil temperatures are of value in safeguarding the

crop in various operations. The long-term averages of soil temperature

are essential in designing storage facilities for such crops as potatoes.

The handling and preparation of potatoes for safe storage are dependent

upon field soil temperature because the tubers are about equal in tempera-

ture to the soil.

There is potentially a very large dollar saving available to potato

growers in planning harvest operations based on soil temperature. Careful

use of soil temperature information and forecasts of variation in these

temperatures should reduce bruising damage to tubers. It has been estimated

that this kind of harvest loss amounts to millions of dollars annually.

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Weather Service for AgricultureOregon State UniversityAgriculture Hall 327

Hyslop Field LaboratoryFrequency of Occurrence4-Inch Soil Temperature Page 8

Maximum Minimum

Category Occurrence Category Occurrence

January 31 to 40° 32% 21 to 30° 1%41 to 50° 66% 31 to 40° 53%51 to 60° 2% 41 to 50° 46%

51 to 60° #

February 31 to 40° 6% 31 to 40° 33%41 to 50° 92% 41 to 50° 67%51 to 60° 2%

March

31 to 40° 1% 31 to 40° 28%41 to 50° 62% 41 to 50° 72%51 to 60° 37% 51 to 60° #61 to 70° #

April 41 to 50° 11% 31 to 40° 3%51 to 60° 74% 41 to 50° 82%61 to 70° 15% 51 to 60° 15%

May 41 to 50° 1% 41 to 50° 24%51 to 60° 43% 51 to 60° 66%71 to 80° 35% 61 to 70° 10%81 to 90° 2%

June

51 to 60° 2% 51 to 60° 44%61 to 70° 31% 61 to 70° 54%71 to 80° 45% 71 to 80° 2%81 to 90° 22%

July

61 to 70° 5% 51 to 60° 8%71 to 80° 31% 61 to 70° 69%81 to 90° 62% 71 to 80° 23%91 to 100° 2%

# Less than one percent

Maximum Minimum


August 61 to 70° 9% 51 to 60° 8%71 to 80° 34% 61 to 70° 69%81 to 90° 55% 71 to 80° 23%91 to 100° 2%

September 51 to 60° 5% 41 to 50° 1%61 to 70° 44% 51 to 60° 50%71 to 80° 41% 61 to 70° 48%81 to 90° 10% 71 to 80° 1%

October 41 to 50° 6% 31 to 40° 1%51 to 60° 58% 41 to 50° 42%61 to 70° 34% 51 to 60° 56%71 to 80° 2% 61 to 70° 1%

November 31 to 40° 3% 31 to 40° 13%41 to 50° 65% 41 to 50° 81%51 to 60° 32% 51 to 60° 6%

December 21 to 30° # 21 to 30° 1%31 to 40° 34% 31 to 40° 50%41 to 50° 65% 41 to 50° 49%51 to 60° 1%


Hyslop Farm, Corvallis, Oregon

2-Inch Soil Temperature

Weekly AveragePage 10

Week begins Max Min Week begins Max Min

January 1 41 37 July 2 87 64

January 8 39 35 July 9 87 64

January 15 44 39 July 16 90 65

January 22 43 39 July 23 91 66

January 29 44 38 July 30 8.9 67

February 5 46 38 August 6 92 67




March 5 51 40 September 3 81 61




April 2 60 44 October 1 69 53


April 16 60 45 October 15 60 48

April 23 63 47 October 22 55 48

April 30 67 48 October 29 54 46

May 7 72 51 November 5 51 45

May 14 73 53 November 12 50 45

May 21 75 55 November 19 48 42

May 28 78 57 November 26 46 42

June 4 78 59 December 3 45 41

June 11 80 60 December 10 42 39

June 18 83 62 December 17 42 38

June 25 81 61 December 24 44 40



Weekly AveragePage 11


January 1 40 38 July 2 81 66

January 8 38 36 July 9 81 66

January 15 42 40 July 16 82 68

January 22 42 40 July 23 84 68

January 29 42 39 July 30 83 69










Apri l 9 54 46 October 8 61 50

April 16 55 46 October 15 57 50

April 23 58 49 October 22 54 49

April 30 61 51 October 29 52 48

May 7 66 53 November 5 50 47

May 14 68 55 November 12 49 46

May 21 70 57 November 19 46 43

May 28 72 58 November 26 43 42


June 11 74 61 December 10 41 39

June 18 77 63 December 17 41 39

June 25 75 62 December 24 42 41



Weekly Average

Page 12


January 1 40 38 July 2 74 68

January 8 38 36 July 9 75 69

January 15 41 39 July 16 77 70

January 22 40 39 July 23 77 71

January 29 40 39 July 3o 77 72











April 16 51 48 October 15 58 54

April 23 55 50 October 22 55 52

April 30 57 52 October 29 52 50

May 7 60 55 November 5 51 49

May 14 62 57 November 12 49 47

May 21 64 59 November 19 46 45

May 28 65 60 November 26 45 43


June 11 69 63 December 10 42 40

June 18 72 65 December 17 41 39

June 25 70 65 December 24 42 41

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North Willamette Experiment StationFrequency of Occurrence2-Inch Soil Temperature Page 14

Maximum Minimum


January 21 to 30° 5% 21 to 30° 9%31 to 40° 33% 31 to 40° 73%41 to 50° 57% 41 to 50° 18%51 to 60° 5%

February 21 to 30° 2% 21 to 30° 4%31 to 40° 4% 31 to 40° 78%41 to 50° 58% 41 to 50° 18%51 to 60° 34% 51 to 60° #

March 31 to 40° 1% 21 to 30° 1%41 to 50° 26% 31 to 40° 66%51 to 60° 53% 41 to 50° 32%61 to 70° 19% 51 to 60° 1%71 to 80° 1%

April 41 to 50° 3% 31 to 40° 28%51 to 60° 44% 41 to 50° 66%61 to 70° 40% 51 to 60° 6%71 to 80° 12%81 to 90° 1%

51 to 60° 10% 31 to 40° 1%61 to 70° 31% 41 to 50° 48%71 to 80° 27% 51 to 60° 47%81 to 90° 26% 61 to 70° 4%91 to 100° 6% 71 to 80° #

51 to 60° 2% 41 to 50° 6%61 to 70° 20% 51 to 60° 69%71 to 80° 27% 61 to 70° 22%81 to 90° 29% 71 to 80° 3%91 to 100° 21%101 to 110° 1%

61 to 70° 4% 41 to 50° #71 to 80° 11% 51 to 60° 27%81 to 90° 24% 61 to 70° 67%91 to 100° 53% 71 to 80° 5%101 to 110° 8% 81 to 90° 1%


May

June

July

Maximum Minimum


August 51 to 60° 1% 41 to 50° #61 to 70° 5% 51 to 60° 36%71 to 80° 13% 61 to 70° 60%81 to 90° 29% 71 to 80° 4%91 to 100° 47%101 to 110° 5%

September 51 to 60° 2% 31 to 40° #

61 to 70° 29% 41 to 50° 14%

71 to 80° 34% 51 to 60° 62%

81 to 90° 30% 61 to 70° 24%

91 to 100° 5% 71 to 80° #

October 41 to 50° 5% 31 to 40° 8%51 to 60° 41% 41 to 50° 66%

61 to 70° 41% 51 to 60° 26%

71 to 80° 12% 61 to 70° #

November 31 to 40° 2% 21 to 30° #41 to 50° 50% 31 to 40° 43%51 to 60° 46% 41 to 50° 54%61 to 70° 2% 51 to 60° 3%

December 21 to 30° 5% 21 to 30° 7%31 to 40° 24% 31 to 40° 69%41 to 50° 67% 41 to 50° 24%51 to 60° 4%


North Willamette Experiment Station, Aurora, Oregon


Weekly Average

Page 16


January 1 39 34 July 2 87 61

January 8 40 36 July 9 88 63

January 15 44 38 July 16 92 64

January 22 43 36 July 23 93 63

January 29 44 36 July 30 91 64











April 16 60 43 October 15 61 46

April 23 65 45 October 22 58 46

April 30 69 47 October 29 55 45

May 7 73 49 November 5 53 43

May 14 76 52 November 12 50 42

May 21 77 54 November 19 49 40

May 28 78 55 November 26 46 39


June 11 81 58 December 10 41 38

June 18 83 60 December 17 42 37

June 25 82 58 December 24 43 38

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Pitchford Boys RanchFrequency of Occurrence4-Inch Soil Temperature Page 18

Maximum Minimum


January 31 to 40° 18% 31 to 40° 47%41 to 50° 76% 41 to 50° 53%51 to 60° 67% 51 to 60° #61 to 70° #

February 31 to 40° 4% 31 to 40° 13%41 to 50° 65% 41 to 50° 86%51 to 60° 31% 51 to 60° 1%

March 41 to 50° 30% 31 to 40° 8%51 to 60° 65% 41 to 50° 78%61 to 70° 5% 51 to 60° 14%

April 41 to 50° 1% 31 to 40° 2%51 to 60° 51% 41 to 50° 54%61 to 70° 47% 51 to 60° 44%71 to 80° 1%

May

51 to 60° 3% 41 to 50° 5%61 to 70° 39% 51 to 60° 64%71 to 80° 44% 61 to 70° 31%81 to 90° 12%91 to 100° 2%

June

61 to 70° 9% 51 to 60° 10%71 to 80° 44% 61 to 70° 79%81 to 90° 39% 71 to 80° 11%91 to 100° 2%

July 61718191

to 70° #to 80° 10%to 90° 62%to 100° 28%


51 to 60° #61 to 70° 51%71 to 80° 48%81 to 90° 1%

Maximum Minimum


August 61 to 70° 1% 51 to 60° 2%71 to 80° 30% 61 to 70° 63%81 to 90° 48% 71 to 80° 35%91 to 100° 19%101 to 110° 2%

September 51 to 60° 1% 51 to 60° 26%61 to 70° 17% 61 to 70° 72%71 to 80° 52% 71 to 80° 2%81 to 90° 25%91 to 100° 5%

October 41 to 50° 2% 41 to 50° 26%51 to 60° 39% 51 to 60° 65%61 to 70° 47% 61 to 70° 9%71 to 80° 12%

November 41 to 50° 43% 31 to 40° 2%51 to 60° 56% 41 to 50° 79%61 to 70° 1% 51 to 60° 18%

61 to 70° 1%

December 31 to 40° 13% 31 to 40° 23%41 to 50° 83% 41 to 50° 77%51 to 60° 4%


Pitchford Boys Ranch, Roseburg, Oregon


Weekly Average

Page 20


January 1 41 38 July 2 85 68

January 8 44 41 July 9 86 69

January 15 48 44 July 16 89 72

January 22 45 42 July 23 89 72

January 29 45 42 July 30 87 71











April 16 61 50 October 15 61 52

April 23 62 52 October 22 57 51

April 30 67 52 October 29 56 49

May 7 71 57 November 5 53 48

May 14 77 60 November 12 52 49

May 21 77 60 November 19 49 46

May 28 77 63 November 26 48 46


June 11 78 64 December 10 45 42

June 18 83 67 December 17 46 44

June 25 83 68 December 24 44 41

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Medford, OregonFrequency of Occurrence4-Inch Soil Temperature Page 22

Maximum Minimum


January 31 to 40° 45% 31 to 40° 65%41 to 50° 52% 41 to 50° 34%51 to 60° 3% 51 to 60° 1%

February 31 to 40° 8% 31 to 40° 31%41 to 50° 79% 41 to 50° 66%51 to 60° 13% 51 to 60° 3%

March 41 to 50° 41% 31 to 40° 5%51 to 60° 56% 41 to 50° 82%61 to 70° 3% 51 to 60° 13%

April 41 to 50° 5% 41 to 50° 42%51 to 60° 72% 51 to 60° 58%61 to 70° 23%71 to 80° #

15% 4153% 5129% 613% 71

36% 5144% 6120% 71

4% 5146% 6136% 7114% 81

May 51 to 60°61 to 70°71 to 80°81 to 90°

June 61 to 70°71 to 80°81 to 90°

July 61 to 70°71 to 80°81 to 90°91 to 100°

to 50° 2%to 60° 56%to 70° 41%to 80° 1%

to 60° 20%to 70° 58%to 80° 22%

to 60° #to 70° 35%to 80° 58%to 90° 7%


Maximum Minimum


August 61 to 70°71 to 80°81 to 90°91 to 100°

September 51 to 60°61 to 70°71 to 80°81 to 90°

October 41 to 50°51 to 60°61 to 70°71 to 80°

November 31 to 40°41 to 50°51 to 60°

December 31 to 40°41 to 50°51 to 60°

2% 5150% 6135% 7113% 81

# 5134% 6140% 7126%

1% 3140% 4149% 5110% 61

1% 3148% 4151% 51

27% 3169% 41

4% 51

to 60° #to 70° 38%to 80° 57%to 90° 5%

to 60° 11%to 70° 69%to 80° 20%

to 40° #to 50° 12%to 60° 72%to 70° 16%

to 40° 10%to 50° 65%to 60° 25%

to 40° 47%to 50° 52%to 60° 1%

Less than one percent

Medford, Oregon


Weekly Average Page 24


January 1 40 39 July 2 79 71

January 8 42 40 July 9 80 72

January 15 43 40 July 16 82 74

January 22 42 40 July 23 83 74

January 29 42 40 July 30 83 77











April 16 58 52 October 15 61 55

April 23 58 53 October 22 58 53

April 30 63 56 October 29 55 51

May 7 67 59 November 5 53 49

May 14 68 60 November 12 51 48

May 21 70 61 November 19 48 45

May 28 71 63 November 26 46 44


June 11 73 66 December 10 44 42

June 18 76 69 December 17 42 40

June 25 76 68 December 24 43 41

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Weather Service for AgricultuOtOregon State UniversityAgriculture Hall 327

Central Oregon Experimental StationFrequency of Occurrence4-Inch Soil Temperature

Page 26

Maximum Minimum


April 41 to 50° 30% 31 to 40° 54%51 to 60° 63% 41 to 50° 46%61 to 70° 7%

May 41 to 50° 2% 31 to 40° 1%51 to 60° 19% 41 to 50° 58%61 to 70° 45% 51 to 60° 41%71 to 80° 31%81 to 90° 3%

June 51 to 60° 3% 41 to 50° 5%61 to 70° 22% 51 to 60° 79%71 to 80° 52% 61 to 70° 16%81 to 90° 23%

July 61 to 70° 4% 41 to 50° 2%71 to 80° 46% 51 to 60° 46%81 to 90° 47% 61 to 70° 52%91 to 100° 3%

August 61 to 70° 2% 51 to 60° 47%71 to 80° 47% 61 to 70° 53%81 to 90° 51%

September 41 to 50° 2% 41 to 50° 55%51 to 60° 14% 51 to 60° 41%61 to 70° 54% 61 to 70° 4%71 to 80° 30%


Central Oregon Experiment Station, Redmond, Oregon


Weekly Average

Week Begins Max Min

April 1 51 38

April 8 51 40

April 15 51 39

April 22 54 40

April 29 60 44

May 6 60 46

May 13 65 48

May 20 66 49

May 27 71 51

June 3 73 55

Jun 10 72 55

June 17 77 57

June 24 75 57

July 1 79 58

July 8 79 60

July 15 82 63

July 22 80 61

July 29 81 62

August 5 81 62

August 12 80 60

August 19 79 59

August 26 79 60

September 2 69 54

September 9 70 49

September 16 66 49

September 23 63 47

Page 27

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Madras, OregonFrequency of Occurrence4-Inch Soil Temperature Page 29

Maximum Minimum


April 41 to 50° 7% 31 to 40° #

51 to 60° 76% 41 to 50° 72%61 to 70° 16% 51 to 60° 28%71 to 80° 1%

May

51 to 60° 12% 41 to 50° 7%61 to 70° 63% 51 to 60° 57%71 to 80° 25% 61 to 70° 36%

June

51 to 60° 1% 51 to 60 17%61 to 70° 18% 61 to 70° 66%71 to 80° 65% 71 to 80° 17%81 to 90° 16%

July

61 to 70° 1% 51 to 60° #71 to 80° 30% 61 to 70° 29%81 to 90° 69% 71 to 80° 71%91 to 100° 1%

August

61 to 70° 3% 51 to 60° 1%71 to 80° 35% 61 to 70° 36%81 to 90° 59% 71 to 80° 63%91 to 100° 3%

September 51 to 60° 2% 41 to 50° 5%61 to 70° 42% 51 to 60° 42%71 to 80° 52% 61 to 70° 46%81 to 90° 4% 71 to 80° 7%

October 41 to 50° '8% 31 to 40° 3%51 to 60° 59% 41 to 50 42%61 to 70° 31% 51 to 60° 51%71 to 80° 2% 61 to 70° 4%


Madras, Oregon




April 1 55 47 August 5 84 74

April 8 56 48 August 12 82 72

April 15 56 48 August 19 80 70

April 22 58 50 August 26 78 67

April 29 61 53 September 2 75 64

May 6 65 56 September 9 73 62

May 13 68 59 September 16 69 59May 20 69 60 September 23 68 58

May 27 71 62 September 30 65 57June 3 74 65 October 7 62 54

June 10 73 64 October 14 57 50

June 17 78 67 October 21 55 49

June 24 77 67 October 28 51 46

July 1 80 70

July 8 81 72

July 15 82 73

July 22 83 73

July 29 84 74

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Moro, OregonFrequency of Occurrence4-Inch Soil Temperature Page 32

Maximum Minimum


April 41 to 50° 5% 31 to 40° 10%51 to 60° 36% 41 to 50° 78%61 to 70° 47% 51 to 60° 10%71 to 80° 12% 61 to 70° 2%

May 51 to 60° 16% 41 to 50° 37%61 to 70° 36% 51 to 60° 55%71 to 80° 43% 61 to 70° 8%81 to 90° 5%

June 51 to 60° 2% 41 to 50° 2%61 to 70° 22% 51 to 60° 58%71 to 80° 40% 61 to 70° 39%81 to 90° 36% 71 to 80° 1%

July 51 to 60° 1% 51 to 60° 9%61 to 70° 2% 61 to 70° 74%71 to 80° 20% 71 to 80° 17%81 to 90° 57%91 to 100° 20%

August 61 to 70° 5% 51 to 60° 33%71 to 80° 35% 61 to 70° 52%81 to 90° 45% 71 to 80° 15%91 to 100° 15%

September 51 to 60° 1% 41 to 50° 12%61 to 70° 38% 51 to 60° 77%71 to 80° 53% 61 to 70° 11%81 to 90° 7%91 to 100° 1%

October 41 to 50° 3% 31 to 40° 9%51 to 60° 36% 41 to 50° 69%61 to 70° 44% 51 to 60° 22%71 to 80° 17%


Moro, Oregon




April 1 60 43 August 5 86 67

April 8 60 45 August 12 84 64

April 15 62 47 August 19 81 64

April 22 66 50 August 26 76 58

April 29 64 50 September 2 77 59May 6 69 51 September 9 74 57May 13 67 52 September 16 71 51

May 20 71 53 September 23 73 56

May 27 74 57 September 30 69 52

June 3 75 59 October 7 68 50

June 10 75 59 October 14 59 44

June 17 75 57 October 21 60 44

June 24 75 61 October 28 54 43July 1 82 63

July 8 85 66

July 15 84 66

July 22 87 65

July 29 85 69

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Weather Service for Agriculture

Oregon State UniversityAgriculture Hall 327

Klamath Falls, OregonFrequency of Occurrence4-Inch Soil Temperature Page 35

Maximum Minimum


March

April

May

June

21 to 30° 4% 21 to 30° 7%31 to 40° 36% 31 to 40° 92%41 to 50° 54% 41 to 50° 1%51 to 60° 6%

31 to 40° 4% 31 to 40° 72%

41 to 50° 51% 41 to 50° 27%51 to 60° 34% 51 to 60° 1%

61 to 70° 11%

41 to 50° 6% 31 to 40° 5%51 to 60° 28% 41 to 50° 47%61 to 70° 47% 51 to 60° 46%71 to 80° 19% 61 to 70° 2%

41 to 50° # 41 to 50° 11%51 to 60° 7% 51 to 60° 61%61 to 70° 34% 61 to 70° 28%71 to 80° 55%81 to 90° 4%

July 61 to 70° 7% 51 to 60° 27%71 to 80° 52% 61 to 70° 69%81 to 90° 41% 71 to 80° 4%

August 51 to 60° 2% 41 to 50° 1%

61 to 70° 13% 51 to 60° 35%71 to 80° 62% 61 to 70° 60%81 to 90° 23% 71 to 80° 4%

September 41 to 50° # 31 to 40° #51 to 60° 10% 41 to 50° 17%61 to 70° 43% 51 to 60° 68%71 to 80° 47% 61 to 70° 15%

October 21 to 30° # 21 to 30° 1%31 to 40° 3% 31 to 40° 25%41 to 50° 25% 41 to 50° 60%51 to 60° 47% 51 to 60° 14%61 to 70° 25% 61 to 70° #71 to 80° #

November 21 to 30° # 21 to 30°31 to 40° 48% 31 to 40° 78%41 to 5o° 46 41 to 50° 22%51 to Eo° V:


Klamath Falls, Oregon




March 1 36 33 July 5 79 64

March 8 38 33 July 12 79 64

March 15 41 34 July 19 78 63

March 22 45 36 July 26 78 64

March 29 48 38 August 2 78 63

April 5 50 39 August 9 77 63

April 12 49 39 August 16 77 62

April 19 50 39 August 23 74 60

April 26 55 42 August 30 74 60

May 3 59 46 September 6 73 58

May 10 62 48 September 13 69 55

May 17 66 51 September 20 65 51

May 24 69 54 September 27 64 50

May 31 69 55 October 4 61 48

June 7 69 55 October 11 55 46

June 14 73 57 October 18 52 43

June 21 73 59 October 25 49 40

June 28 78 61 November 1 47 39

November 8 44 39

November 15 40 36

November 22 37 34

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