Monthly Means and Extremes
Whitehorse Ranch, Oregon Period: 1961-1990
Parameter Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Mean Temperature(F)
Maximum 40.7 47.1 52.9 60.4 69.0 77.7 86.7 84.6 76.0 64.7 51.0 42.0 62.3
Minimum 18.8 23.2 26.3 30.1 37.1 44.7 50.6 49.7 41.3 33.0 26.0 19.1 33.5
Mean 29.8 35.1 39.6 45.2 53.0 61.1 68.7 67.1 58.7 48.9 38.5 30.3 47.9
Extreme Temperature(F)
Maximum 65 69 83 84 94 97 102 103 95 87 75 65 103
Minimum -15 -21 -5 8 12 21 29 30 17 5 -5 -26 -26
Precipitation(inches)
Monthly mean .59 .63 .83 .97 .77 .61 .24 .84 .59 .55 .82 .63 8.37
Extreme 24 hr .56 2.14 1.66 2.00 1.66 .75 1.13 2.05 1.31 .58 1.00 2.03 2.14
Snowfall(inches)
Monthly mean 2.78 1.84 2.68 .99 .10 .00 .00 .00 .26 .14 1.87 2.79 16.53
Average number of days
Temperature
Maximum 90 or more .0 .0 .0 .0 .4 2.8 11.5 8.6 1.1 .0 .0 .0 21.4
Maximum 32 or less 5.7 1.8 .2 .0 .0 .0 .0 .0 .0 .0 .9 5.5 14.6
Minimum 32 or less 26.5 23.8 23.2 18.4 8.9 1.3 .2 .1 4.1 13.9 22.8 27.3 169.3
Minimum 0 or less 2.2 .9 .1 .0 .0 .0 .0 .0 .0 .0 .2 2.1 6.8
Precipitation
.01 inches or more 4.8 4.6 5.9 5.0 4.9 3.4 1.6 3.0 3.1 3.9 6.0 4.7 59.2
.10 inches or more 2.2 2.3 2.4 2.8 2.5 2.2 .7 1.9 1.8 2.1 3.0 2.6 29.5
.50 inches or more .1 .1 .2 .3 .2 .2 .1 .5 .2 .1 .3 .1 2.0
1.00 inches or more .0 .0 .1 .2 .0 .0 .0 .2 .1 .0 .0 .0 .2
Degree Days
Heating days @ 65 1093 843 787 594 377 160 34 52 211 501 796 1077 6544
Growing days @ 50 0 1 6 42 153 339 578 531 277 82 6 1 1984
Oregon Climate Service