Monthly Means and Extremes Period: 1971-2000
Howard Prarie Dam, OR
Parameter Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Mean Temperature(F)
Maximum 36.9 41.4 46.5 53.1 62.0 70.5 79.2 79.5 72.9 61.0 42.9 36.0 56.8
Minimum 21.2 22.5 25.0 28.9 34.3 40.4 45.3 44.6 38.7 33.0 27.4 22.6 32.0
Mean 29.1 32.0 35.8 41.0 48.2 55.5 62.3 62.1 55.8 47.0 35.2 29.3 44.4
Extreme Temperature(F)
Maximum 55 67 73 82 92 95 97 100 97 86 68 55 100
Minimum -10 -20 -1 7 21 26 29 29 26 8 1 -20 -20
Precipitation(inches)
Monthly mean 4.85 3.86 3.72 2.39 2.06 1.28 .58 .72 1.07 2.04 4.79 5.21 32.57
Extreme 24 hr 3.93 2.23 2.57 1.12 1.57 1.26 2.14 1.48 1.08 1.87 3.31 2.58 3.93
Snowfall(inches)
Monthly mean 25.28 23.84 19.44 9.24 2.91 .26 .00 .00 .20 1.59 19.23 25.33 133.66
Average number of days
Temperature
Maximum 90 or more .0 .0 .0 .0 .1 .3 3.0 3.0 .5 .0 .0 .0 6.6
Maximum 32 or less 7.0 2.4 .6 .1 .0 .0 .0 .0 .0 .1 2.2 8.1 21.7
Minimum 32 or less 29.4 26.5 28.9 23.4 14.0 3.6 .3 .2 4.4 15.8 25.7 29.7 203.7
Minimum 0 or less 1.1 .7 .0 .0 .0 .0 .0 .0 .0 .0 .0 .6 2.6
Precipitation
.01 inches or more 14.1 13.8 15.3 12.3 9.9 6.1 2.9 3.0 4.7 7.7 14.7 14.4 120.9
.10 inches or more 10.1 9.5 10.3 7.9 5.9 3.9 1.4 1.7 2.7 5.3 10.8 11.0 82.4
.50 inches or more 2.7 2.3 1.7 .9 1.0 .6 .3 .5 .6 1.2 2.9 3.5 19.0
1.00 inches or more .9 .6 .4 .1 .1 .1 .1 .1 .0 .3 1.0 .9 4.8
Degree Days
Heating days @ 65 (F) 1123 934 907 728 538 304 141 145 292 569 912 1119 7770
Growing days @ 50 (F) 0 0 0 11 67 187 365 358 195 51 0 0 1221