Official 1981-2010 Climate Normals City: ALEDO State: IL ID: 110072 Latitude: 41.1961 Longitude: -90.7478 Elevation: 720.0 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 29.9 34.5 47.6 61.5 71.5 80.6 83.9 82.1 75.3 63.0 48.1 33.4 Mean: 21.5 25.7 37.3 49.6 60.2 70.0 73.4 71.7 63.8 51.8 38.8 25.5 Low: 13.0 16.8 26.9 37.8 48.8 59.4 62.9 61.2 52.3 40.6 29.4 17.5 CDD: 0 0 0 7 44 178 264 217 80 8 0 0 HDD: 1350 1102 861 468 195 28 4 11 117 417 788 1226 Number of Days T090: 0.0 0.0 0.0 0.0 0.2 2.0 5.2 3.4 0.9 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: 5.9 3.0 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.1 T032: 29.6 25.7 22.0 7.7 0.4 0.0 0.0 0.0 0.2 5.9 18.4 28.4 ------------------------------------------------------------------------------------------ Annual Values High Temp: 59.4 F Mean Temp: 49.2 F Low Temp: 39.0 F Cooling DD: 800 Heating DD: 6565 Days above 90 (T090): 11.7 Days above 100 (T100): 0.3 Days below 0 (T000): 12.2 Days below 32 (T032): 138.4 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.41 1.54 2.46 3.75 4.36 4.82 3.94 4.11 3.43 3.02 2.36 2.09 Number of Days P001: 5.5 5.6 7.3 9.0 10.1 8.8 7.5 7.9 6.1 7.3 6.6 6.1 P010: 3.7 4.1 5.5 7.4 8.5 7.3 6.4 6.7 5.0 5.7 5.1 4.6 P100: 0.2 0.2 0.6 1.0 1.3 1.4 1.1 1.5 0.8 0.8 0.3 0.4 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 37.29 inches Days precipitation at or above 0 inches (P000): 87.8 Days precipitation at or above 0.10 inches (P010): 70.0 Days Precipitation at or above 1.00 inches (P100): 9.6 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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