Monthly Means and Extremes
Fossil, Oregon Period: 1961-1990
Parameter Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Mean Temperature (F)
Maximum 41.1 47.0 51.9 58.6 66.9 75.0 83.5 83.2 74.8 65.8 48.7 41.6 61.1
Minimum 23.8 26.8 28.6 31.0 35.5 42.3 45.1 45.9 39.8 34.1 29.8 25.3 34.1
Mean 32.5 36.8 40.3 44.8 51.4 58.6 64.3 64.5 57.3 50.0 39.3 33.5 47.6
Extreme Temperature (F)
Maximum 67 72 78 87 97 97 100 105 97 98 75 67 105
Minimum -19 -22 4 12 15 25 25 30 18 6 -16 -24 -24
Precipitation (inches)
Monthly mean 1.66 1.23 1.34 1.41 1.27 1.03 .49 .80 .84 1.16 1.92 1.80 14.96
Extreme 24 hour 1.11 .98 .78 1.08 1.70 1.52 1.40 1.56 .98 1.21 1.12 1.97 1.97
Snowfall (inches)
Monthly mean 4.09 2.10 .95 .26 .24 .00 .00 .00 .00 .33 2.17 3.74 17.81
Average number of days
Temperature
Maximum 90 or more .0 .0 .0 .0 .2 1.8 8.2 7.6 1.3 .6 .0 .0 18.4
Maximum 32 or less 6.2 1.8 .2 .0 .0 .0 .0 .0 .0 .0 1.6 5.3 17.3
Minimum 32 or less 23.8 20.7 21.0 18.0 10.7 2.2 .6 .2 5.4 12.8 17.3 23.3 153.8
Minimum 0 or less 1.8 .7 .0 .0 .0 .0 .0 .0 .0 .0 .3 1.0 3.0
Precipitation
.01 inches or more 10.0 8.7 10.4 8.8 7.2 6.0 2.9 3.4 4.5 6.7 10.2 9.9 89.0
.10 inches or more 5.3 4.4 5.0 4.6 3.8 3.5 1.5 2.2 2.7 3.6 6.0 5.8 48.7
.50 inches or more .7 .4 .2 .6 .7 .3 .2 .6 .3 .6 .9 .6 6.0
1.00 inches or more .0 .0 .0 .1 .1 .0 .0 .0 .0 .0 .0 .2 .5
Degree Days
Heating days @ 65F 1009 797 766 606 427 213 91 84 242 472 772 978 6499
Growing days @ 50F 1 2 5 29 111 267 444 450 236 94 7 2 1590
Oregon Climate Service