Official 1981-2010 Climate Normals City: AURORA State: IL ID: 110338 Latitude: 41.7806 Longitude: -88.3092 Elevation: 659.9 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 30.3 35.0 46.8 60.0 70.9 80.3 83.9 81.7 75.0 62.3 47.7 33.8 Mean: 23.1 27.5 38.2 50.2 60.5 70.1 74.3 72.5 64.9 52.6 40.1 27.0 Low: 15.9 20.0 29.6 40.3 50.1 60.0 64.8 63.3 54.9 42.8 32.5 20.2 CDD: 0 0 1 9 51 187 292 240 99 11 0 0 HDD: 1299 1050 831 454 191 33 3 8 100 397 747 1178 Number of Days T090: 0.0 0.0 0.0 0.0 0.5 2.9 4.7 3.0 0.9 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.0 0.0 0.0 0.0 0.0 T000: 4.1 1.8 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.9 T032: 28.1 23.9 19.6 5.2 0.2 0.0 0.0 0.0 0.0 3.9 13.8 26.3 ------------------------------------------------------------------------------------------ Annual Values High Temp: 59.1 F Mean Temp: 50.2 F Low Temp: 41.3 F Cooling DD: 890 Heating DD: 6291 Days above 90 (T090): 12.1 Days above 100 (T100): 0.2 Days below 0 (T000): 7.7 Days below 32 (T032): 121.0 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.68 1.72 2.37 3.62 4.01 4.22 3.90 4.07 3.59 3.07 3.24 2.20 Snow: 7.8 6.8 2.5 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.8 8.6 Number of Days P001: 8.9 7.8 10.0 11.4 11.7 10.4 8.9 9.8 8.4 9.1 9.7 10.3 P010: 4.3 4.2 5.3 6.8 7.6 7.2 6.3 6.9 5.5 5.7 5.8 5.0 P100: 0.2 0.2 0.3 0.9 1.0 1.2 0.9 1.1 0.8 0.7 1.0 0.4 S001: 6.1 4.0 1.6 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.8 4.7 S010: 3.5 2.8 0.9 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.3 2.6 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: 37.69 inches Snowfall: 27.1 inches Days precipitation at or above 0 inches (P000): 116.4 Days precipitation at or above 0.10 inches (P010): 70.6 Days Precipitation at or above 1.00 inches (P100): 8.7 Days Snowfall at or above 0.1 inches (S001): 17.5 Days Snowfall at or above 1.0 inches (S010): 10.3 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