Monthly Means and Extremes
Howard Prairie Dam, Oregon Period: 1961-1990
Parameter Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Mean Temperature (F)
Maximum 37.5 42.4 45.9 52.2 61.0 70.2 78.6 78.4 71.6 60.7 43.7 36.5 56.5
Minimum 18.9 21.1 23.8 27.5 33.1 40.0 43.6 43.2 37.7 32.3 26.7 21.1 30.7
Mean 28.2 31.8 34.8 39.8 47.1 55.1 61.1 60.8 54.7 46.5 35.2 28.8 43.6
Extreme Temperature (F)
Maximum 55 67 73 82 92 95 97 100 97 86 71 55 100
Minimum -20 -20 -2 7 20 26 29 29 22 8 1 -20 -20
Precipitation (inches)
Monthly mean 4.75 3.53 3.72 2.27 1.83 1.25 .41 .80 1.08 2.12 5.04 5.82 33.04
Extreme 24 hour 3.93 2.11 2.57 1.34 1.12 1.26 2.14 1.17 1.10 1.87 3.31 4.34 4.34
Snowfall (inches)
Monthly mean 28.03 20.84 25.84 12.07 3.45 .21 .00 .00 .20 2.40 19.14 32.01 147.09
Average number of days
Temperature
Maximum 90 or more .0 .0 .0 .0 .1 .5 2.9 2.2 .3 .0 .0 .0 6.2
Maximum 32 or less 7.5 2.2 .9 .1 .0 .0 .0 .0 .0 .1 1.9 8.3 21.4
Minimum 32 or less 29.6 26.7 29.4 25.4 15.6 3.3 .4 .2 5.3 16.6 25.5 29.3 208.4
Minimum 0 or less 1.5 .8 .1 .0 .0 .0 .0 .0 .0 .0 .0 .7 3.0
Precipitation
.01 inches or more 13.8 12.9 14.8 11.9 9.3 6.6 2.5 3.6 4.7 8.1 14.8 15.4 119.0
.10 inches or more 9.8 8.8 10.4 7.3 5.6 4.0 1.1 2.1 2.8 5.4 10.6 11.8 80.6
.50 inches or more 2.8 2.0 1.8 1.0 .8 .5 .2 .5 .7 1.1 3.2 3.9 18.9
1.00 inches or more .9 .5 .4 .0 .0 .1 .0 .0 .1 .3 1.2 1.0 4.6
Degree Days
Heating days @ 65F 1142 938 935 755 557 306 153 158 313 573 895 1122 7865
Growing days @ 50F 0 0 0 9 59 191 348 338 177 49 0 0 1173
Oregon Climate Service