Official 1981-2010 Climate Normals City: BENTLEY State: IL ID: 110598 Latitude: 40.3436 Longitude: -91.1125 Elevation: 649.8 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 34.7 39.7 51.7 64.1 74.1 83.4 88.2 86.3 79.4 67.0 52.6 38.4 Mean: 25.2 29.8 40.9 52.4 62.8 71.8 76.3 74.1 66.2 54.7 41.8 29.0 Low: 15.7 20.0 30.1 40.7 51.4 60.3 64.3 62.0 53.0 42.4 31.0 19.7 CDD: 0 0 1 16 72 222 349 288 116 20 0 0 HDD: 1233 984 749 394 142 17 1 4 80 339 696 1114 Number of Days T090: 0.0 0.0 0.0 0.1 0.9 5.7 11.7 8.2 3.3 0.4 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.4 0.3 0.0 0.0 0.0 0.0 T000: 3.6 1.6 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.0 T032: 28.4 24.6 19.0 5.9 0.2 0.0 0.0 0.0 0.1 4.3 16.9 27.2 ------------------------------------------------------------------------------------------ Annual Values High Temp: 63.4 F Mean Temp: 52.2 F Low Temp: 41.0 F Cooling DD: 1084 Heating DD: 5753 Days above 90 (T090): 30.2 Days above 100 (T100): 0.8 Days below 0 (T000): 7.4 Days below 32 (T032): 126.6 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.41 1.79 2.75 3.86 4.91 4.52 4.42 4.16 3.72 3.02 2.78 2.08 Snow: 6.0 5.3 2.1 0.5 0.0 0.0 0.0 0.0 0.0 0.0 1.0 5.8 Number of Days P001: 6.9 6.4 8.6 10.8 11.8 10.3 9.3 8.9 7.4 8.8 8.6 7.5 P010: 3.5 3.7 5.6 7.0 8.0 6.7 6.0 5.6 5.1 5.3 5.3 4.3 P100: 0.3 0.4 0.7 0.9 1.3 1.2 1.3 1.3 1.0 0.7 0.7 0.4 S001: 4.3 3.4 1.1 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.7 3.6 S010: 2.5 2.2 0.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.4 2.3 S100: 0.0 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: 39.42 inches Snowfall: 20.7 inches Days precipitation at or above 0 inches (P000): 105.3 Days precipitation at or above 0.10 inches (P010): 66.1 Days Precipitation at or above 1.00 inches (P100): 10.2 Days Snowfall at or above 0.1 inches (S001): 13.3 Days Snowfall at or above 1.0 inches (S010): 8.2 Days Snowfall at or above 10.0 inches (S100): 0.0 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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