Official 1981-2010 Climate Normals City: MORRISON State: IL ID: 115833 Latitude: 41.8039 Longitude: -89.9744 Elevation: 602.9 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 30.9 35.9 48.2 61.8 72.7 82.0 85.4 83.3 76.4 63.9 49.2 35.0 Mean: 21.6 26.3 37.9 49.9 60.9 70.3 73.9 71.8 63.7 51.6 39.4 26.1 Low: 12.3 16.6 27.6 38.0 49.0 58.6 62.4 60.3 50.9 39.4 29.5 17.1 CDD: 0 0 0 8 51 185 279 221 78 7 0 0 HDD: 1345 1085 841 461 180 26 3 10 119 421 770 1207 Number of Days T090: 0.0 0.0 0.0 0.1 0.7 4.1 7.2 4.6 1.4 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.2 0.0 0.0 0.0 0.0 T000: 6.1 3.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.4 T032: 29.9 25.7 21.8 6.9 0.5 0.0 0.0 0.0 0.4 7.1 18.5 28.1 ------------------------------------------------------------------------------------------ Annual Values High Temp: 60.5 F Mean Temp: 49.5 F Low Temp: 38.6 F Cooling DD: 830 Heating DD: 6467 Days above 90 (T090): 18.0 Days above 100 (T100): 0.4 Days below 0 (T000): 13.3 Days below 32 (T032): 138.9 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.48 1.69 2.68 3.48 4.20 4.83 3.94 4.70 2.96 2.97 2.74 2.09 Snow: 10.4 6.1 3.2 1.0 0.0 0.0 0.0 0.0 0.0 0.0 1.7 7.9 Number of Days P001: 7.6 6.3 8.4 10.4 10.9 9.8 8.8 9.0 7.7 8.2 8.6 8.4 P010: 4.0 3.9 5.4 6.6 7.9 7.0 6.0 6.9 5.2 5.3 5.6 5.0 P100: 0.1 0.4 0.5 0.8 1.0 1.4 1.2 1.5 0.9 0.7 0.5 0.4 S001: 4.9 3.1 1.5 0.4 0.0 0.0 0.0 0.0 0.0 0.0 1.0 4.6 S010: 4.0 2.6 1.3 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.8 4.0 S100: 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 37.76 inches Snowfall: 30.3 inches Days precipitation at or above 0 inches (P000): 104.1 Days precipitation at or above 0.10 inches (P010): 68.8 Days Precipitation at or above 1.00 inches (P100): 9.4 Days Snowfall at or above 0.1 inches (S001): 15.5 Days Snowfall at or above 1.0 inches (S010): 13.0 Days Snowfall at or above 10.0 inches (S100): 0.1 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ KEY: High - average daily high temperature, degrees F Mean - average daily mean temperature, degrees F Low - average daily low temperature, degrees F CDD - cooling degree days, base 50F HDD - heating degree days, base 50F T090 - number of Days with Temperatures above 90 degrees F T100 - number of Days with Temperatures above 100 degrees F T000 - number of Days with Temperatures below 0 degrees F T032 - number of Days with Temperatures below 32 degrees F Prcp - precipitation, inches Snow - snowfall, inches P001 - number of Days with Precipitation of 0.01 inches or more P010 - number of Days with Precipitation of 0.10 inches or more P100 - number of Days with Precipitation of 1.00 inches or more S001 - number of Days with Snowfall of 0.1 inches or more S010 - number of Days with Snowfall of 1.0 inches or more S100 - number of Days with Snowfall of 10.0 inches or more Page Source: Dr. Jim Angel, State Climatologist Illinois State Water Survey Prairie Research Institute University of Illinois Data Source: NOAA National Climatic Data Center