Monthly Means and Extremes
Hart Mountain Refuge, Oregon Period: 1961-1990
Parameter Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Mean Temperature (F)
Maximum 39.3 41.9 45.0 52.9 62.4 71.5 81.2 80.2 71.2 60.9 46.0 39.5 57.7
Minimum 18.3 21.1 22.2 26.0 32.2 39.1 43.9 43.6 37.0 30.6 24.3 18.0 29.8
Mean 29.0 31.6 33.5 39.4 47.3 55.3 62.5 61.9 54.1 45.8 35.2 28.9 43.8
Extreme Temperature (F)
Maximum 60 67 71 81 88 93 97 98 95 84 72 63 98
Minimum -28 -26 -11 -4 12 21 23 25 11 4 -9 -32 -32
Precipitation (inches)
Monthly mean .87 .74 1.22 1.33 1.43 1.34 .43 .61 .82 .97 1.16 1.13 12.04
Extreme 24 hour 1.20 .72 1.01 2.80 1.53 2.21 .82 1.27 1.36 2.00 1.56 1.30 2.80
Snowfall (inches)
Monthly mean 7.29 6.05 8.37 4.31 1.77 .48 .00 .00 .59 1.97 5.32 8.38 49.47
Average number of days
Temperature
Maximum 90 or more .0 .0 .0 .0 .0 .6 3.3 2.7 .3 .0 .0 .0 7.4
Maximum 32 or less 6.3 3.6 2.3 .5 .0 .0 .0 .0 .0 .2 2.3 6.8 23.0
Minimum 32 or less 27.5 25.0 27.4 22.8 16.6 5.7 1.5 2.1 8.2 16.9 23.3 27.1 204.4
Minimum 0 or less 2.5 1.1 .4 .0 .0 .0 .0 .0 .0 .0 .2 1.9 6.3
Precipitation
.01 inches or more 7.1 6.8 9.0 8.0 7.8 6.9 3.0 4.0 4.6 5.5 8.6 8.3 79.8
.10 inches or more 3.1 2.6 3.9 4.2 4.3 3.7 1.4 1.8 2.0 3.0 4.0 3.9 38.0
.50 inches or more .2 .2 .4 .4 .5 .7 .1 .2 .5 .2 .2 .3 3.7
1.00 inches or more .0 .0 .0 .1 .1 .1 .0 .0 .0 .1 .0 .1 .7
Degree Days
Heating days @ 65F 1118 943 975 767 549 301 119 135 332 595 893 1119 7804
Growing days @ 50F 0 0 1 12 63 193 391 373 176 48 1 0 1268
Oregon Climate Service