Monthly Means and Extremes
Riddle, Oregon Period: 1961-1990
Parameter Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Mean Temperature (F)
Maximum 49.0 54.8 58.7 63.4 69.6 76.8 83.4 83.7 78.7 68.6 54.7 48.3 65.7
Minimum 33.9 35.7 37.1 39.1 43.7 49.5 52.6 52.5 47.0 42.3 39.3 34.9 42.3
Mean 41.4 45.2 47.9 51.3 56.6 63.1 68.0 68.1 62.9 55.4 47.0 41.6 54.0
Extreme Temperature (F)
Maximum 69 78 81 94 99 103 104 110 108 102 77 74 110
Minimum -3 8 23 26 31 35 37 40 30 22 13 3 3
Precipitation (inches)
Monthly mean 4.78 3.42 3.46 1.99 1.24 .64 .29 .63 1.10 2.14 5.36 5.56 30.74
Extreme 24 hour 2.85 3.26 1.82 1.26 1.94 .69 .65 1.36 1.85 2.02 2.39 3.41 3.41
Snowfall (inches)
Monthly mean 2.69 .97 .50 .00 .00 .00 .00 .00 .00 .00 .46 1.56 6.29
Average number of days
Temperature
Maximum 90 or more .0 .0 .0 .1 .8 2.6 7.0 7.5 3.9 .5 .0 .0 22.0
Maximum 32 or less .2 .1 .0 .0 .0 .0 .0 .0 .0 .0 .0 .4 .6
Minimum 32 or less 12.5 7.9 6.3 2.9 .3 .0 .0 .0 .1 1.6 3.5 9.8 45.3
Minimum 0 or less .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Precipitation
.01 inches or more 16.2 14.6 15.8 12.6 7.9 5.5 1.8 3.1 5.1 9.4 16.6 17.0 126.2
.10 inches or more 9.9 8.0 9.0 6.1 4.3 2.3 .8 1.9 2.7 5.0 11.3 11.0 72.4
.50 inches or more 3.3 1.8 1.9 .8 .5 .1 .1 .3 .7 1.2 3.6 3.7 18.1
1.00 inches or more 1.0 .4 .4 .1 .0 .0 .0 .0 .1 .2 1.0 .9 4.2
Degree Days
Heating days @ 65F 731 558 530 413 270 104 26 23 105 301 541 726 4344
Growing days @ 50F 6 16 39 87 214 394 558 561 386 186 32 8 2479
Oregon Climate Service