Monthly Means and Extremes
Prospect, Oregon Period: 1961-1990
Parameter Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Mean Temperature (F)
Maximum 46.7 51.9 55.4 61.7 70.0 78.4 86.8 86.9 80.7 68.6 52.0 45.6 65.4
Minimum 27.6 29.6 31.1 33.2 38.1 44.1 47.4 46.9 41.8 36.5 32.6 28.6 36.4
Mean 37.2 40.7 43.2 47.4 54.0 61.3 67.1 66.9 61.3 52.5 42.3 37.1 50.9
Extreme Temperature (F)
Maximum 70 76 82 89 102 103 106 110 106 98 79 71 110
Minimum -8 0 5 18 22 28 32 32 25 14 8 -8 -8
Precipitation (inches)
Monthly mean 5.98 4.67 4.62 2.75 2.21 1.01 .38 .99 1.44 3.31 6.84 6.83 41.04
Extreme 24 hour 2.84 2.41 3.23 1.87 1.54 1.03 1.50 1.42 2.38 2.13 2.93 4.39 4.39
Snowfall (inches)
Monthly mean 15.87 8.26 8.69 3.73 .20 .00 .00 .00 .07 .30 3.40 12.98 55.31
Average number of days
Temperature
Maximum 90 or more .0 .0 .0 .0 1.1 4.6 12.6 13.0 6.0 .9 .0 .0 38.3
Maximum 32 or less .4 .1 .0 .0 .0 .0 .0 .0 .0 .0 .0 .7 1.3
Minimum 32 or less 23.5 20.0 19.6 15.3 6.5 .8 .0 .1 2.1 8.6 16.1 22.8 135.7
Minimum 0 or less .1 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .2 .3
Precipitation
.01 inches or more 15.6 14.8 16.4 12.2 9.5 6.1 2.2 3.6 5.5 9.5 17.1 16.5 129.0
.10 inches or more 11.3 10.0 10.9 7.4 5.6 3.0 1.2 2.4 3.5 6.6 12.7 12.2 86.7
.50 inches or more 3.8 3.1 2.6 1.4 1.6 .5 .2 .6 .9 2.5 4.7 4.6 26.4
1.00 inches or more 1.5 .9 .6 .2 .2 .1 .1 .2 .3 .6 1.5 1.7 7.7
Degree Days
Heating days @ 65F 864 685 676 528 348 154 49 47 146 390 680 865 5431
Growing days @ 50F 1 3 10 53 167 341 530 523 343 134 7 1 2114
Oregon Climate Service