Official 1981-2010 Climate Normals City: WINDSOR State: IL ID: 119354 Latitude: 39.4458 Longitude: -88.5961 Elevation: 689.8 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 35.1 40.1 51.9 64.8 74.3 82.9 85.9 84.8 78.7 66.8 52.1 38.3 Mean: 27.8 32.1 42.5 54.1 63.9 72.7 75.9 74.2 67.4 56.0 43.6 31.1 Low: 20.4 24.0 33.2 43.4 53.5 62.4 65.9 63.6 56.0 45.2 35.0 24.0 CDD: 0 0 2 17 81 242 338 289 134 21 1 0 HDD: 1155 922 698 344 115 13 1 4 63 300 644 1049 Number of Days T090: 0.0 0.0 0.0 0.0 0.3 3.7 6.8 5.7 1.8 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.0 0.0 0.0 0.0 T000: 2.1 1.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.1 T032: 26.0 21.2 14.6 3.3 0.1 0.0 0.0 0.0 0.0 2.0 12.3 23.5 ------------------------------------------------------------------------------------------ Annual Values High Temp: 63.1 F Mean Temp: 53.5 F Low Temp: 44.0 F Cooling DD: 1126 Heating DD: 5309 Days above 90 (T090): 18.3 Days above 100 (T100): 0.1 Days below 0 (T000): 4.3 Days below 32 (T032): 103.1 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.36 1.94 3.03 3.84 4.38 4.09 3.97 3.02 3.10 3.66 4.10 2.99 Snow: 4.5 3.4 2.2 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.8 4.8 Number of Days P001: 8.2 6.7 9.9 10.9 12.1 9.8 8.8 7.9 7.2 8.3 9.8 9.1 P010: 4.7 4.3 6.6 7.4 8.2 7.3 6.2 5.5 4.7 5.3 6.6 5.6 P100: 0.4 0.5 0.5 0.9 1.0 0.9 1.0 0.8 0.9 0.9 1.1 0.6 S001: 3.5 1.9 0.9 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.4 2.9 S010: 2.4 1.4 0.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.3 2.0 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: 40.48 inches Snowfall: 15.8 inches Days precipitation at or above 0 inches (P000): 108.7 Days precipitation at or above 0.10 inches (P010): 72.4 Days Precipitation at or above 1.00 inches (P100): 9.5 Days Snowfall at or above 0.1 inches (S001): 9.8 Days Snowfall at or above 1.0 inches (S010): 6.9 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