Official 1981-2010 Climate Normals City: WHEATON 3 SE State: IL ID: 119221 Latitude: 41.8128 Longitude: -88.0728 Elevation: 679.9 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 30.1 35.1 47.0 60.1 70.6 80.1 83.2 81.3 74.8 62.7 47.8 33.7 Mean: 22.4 26.5 36.7 48.3 58.4 68.0 72.2 70.6 63.1 51.4 39.1 26.3 Low: 14.7 17.9 26.5 36.6 46.1 55.9 61.3 59.9 51.4 40.2 30.4 18.9 CDD: 0 0 0 7 35 142 233 191 72 8 0 0 HDD: 1320 1078 876 506 242 53 8 17 129 428 777 1199 Number of Days T090: 0.0 0.0 0.0 0.0 0.3 2.5 4.1 2.4 0.4 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 T000: 4.9 2.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.3 T032: 28.8 25.1 22.3 9.5 1.6 0.0 0.0 0.0 0.4 6.7 17.2 27.2 ------------------------------------------------------------------------------------------ Annual Values High Temp: 59.0 F Mean Temp: 48.7 F Low Temp: 38.4 F Cooling DD: 689 Heating DD: 6633 Days above 90 (T090): 9.7 Days above 100 (T100): 0.1 Days below 0 (T000): 10.0 Days below 32 (T032): 138.8 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.91 1.85 2.46 3.55 4.07 4.18 4.13 4.34 3.43 3.14 3.34 2.38 Snow: 9.6 8.0 3.7 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.7 5.4 Number of Days P001: 9.8 8.2 9.3 10.8 11.1 10.5 9.1 8.9 7.7 8.9 9.4 10.1 P010: 4.9 4.5 5.9 6.9 7.5 7.2 6.5 6.5 5.3 5.7 5.8 5.1 P100: 0.3 0.3 0.3 0.9 1.1 1.1 1.0 1.4 0.8 0.8 0.8 0.4 S001: 5.6 4.1 2.1 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.6 4.4 S010: 3.0 2.4 1.3 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.4 2.2 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: 38.78 inches Snowfall: 28.0 inches Days precipitation at or above 0 inches (P000): 113.8 Days precipitation at or above 0.10 inches (P010): 71.8 Days Precipitation at or above 1.00 inches (P100): 9.2 Days Snowfall at or above 0.1 inches (S001): 17.0 Days Snowfall at or above 1.0 inches (S010): 9.5 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