Monthly Means and Extremes
Brookings, Oregon Period: 1961-1990
Parameter Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Mean Temperature (F)
Maximum 54.7 56.3 57.2 59.6 63.2 66.4 67.7 67.5 68.6 64.4 58.4 54.7 61.6
Minimum 40.9 42.0 41.8 42.5 46.0 49.5 51.2 52.0 51.2 47.9 44.6 41.2 45.9
Mean 47.8 49.1 49.5 51.0 54.6 57.9 59.4 59.8 59.9 56.2 51.5 47.9 53.7
Extreme Temperature (F)
Maximum 73 83 80 85 94 101 102 101 103 94 81 79 103
Minimum 21 24 30 31 32 39 39 42 39 34 29 18 18
Precipitation (inches)
Monthly mean 10.85 9.03 9.49 5.30 3.64 1.55 .53 1.31 2.15 5.84 11.89 12.23 74.78
Extreme 24 hour 4.00 4.20 5.00 3.05 5.97 2.92 1.40 3.61 2.97 5.45 4.58 4.55 5.97
Snowfall (inches)
Monthly mean .21 .30 .07 .00 .00 .00 .00 .00 .00 .00 .00 .07 .35
Average number of days
Temperature
Maximum 90 or more .0 .0 .0 .0 .1 .3 .1 .2 .8 .1 .0 .0 1.8
Maximum 32 or less .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Minimum 32 or less 2.5 1.1 .5 .2 .0 .0 .0 .0 .0 .0 .3 2.0 5.6
Minimum 0 or less .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0
Precipitation
.01 inches or more 16.6 15.7 18.1 12.7 8.7 5.8 3.9 5.3 5.8 10.8 17.5 17.8 140.6
.10 inches or more 13.6 12.7 14.5 9.4 5.6 3.0 1.2 1.9 3.4 7.6 14.6 15.1 103.0
.50 inches or more 7.6 7.0 7.3 3.8 2.4 1.1 .4 .8 1.5 4.4 8.5 9.1 54.6
1.00 inches or more 3.8 2.6 2.6 1.0 .9 .3 .1 .3 .6 1.9 4.1 4.1 22.7
Degree Days
Heating days @ 65F 533 448 482 420 326 220 180 170 172 278 405 530 4156
Growing days @ 50F 30 39 43 66 148 237 292 303 296 194 78 28 1746
Oregon Climate Service, Oregon State University, http://www.ocs.orst.edu