Official 1981-2010 Climate Normals City: MUNDELEIN 4WSW State: IL ID: 115961 Latitude: 42.2553 Longitude: -88.0769 Elevation: 839.7 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 28.8 33.2 44.3 56.9 68.2 77.8 82.1 80.3 72.9 60.4 46.4 32.5 Mean: 20.9 25.1 35.2 46.9 57.6 68.0 72.3 70.7 62.8 50.8 38.3 25.1 Low: 13.1 16.9 26.2 37.0 47.0 58.1 62.6 61.1 52.7 41.1 30.2 17.6 CDD: 0 0 0 4 32 144 236 191 65 7 0 0 HDD: 1365 1118 922 545 261 56 8 14 132 449 801 1238 Number of Days T090: 0.0 0.0 0.0 0.0 0.4 1.6 2.9 1.6 0.3 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T000: 4.6 2.7 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.7 T032: 29.6 25.9 22.5 9.2 0.8 0.0 0.0 0.0 0.0 4.7 17.7 27.3 ------------------------------------------------------------------------------------------ Annual Values High Temp: 57.1 F Mean Temp: 47.9 F Low Temp: 38.7 F Cooling DD: 680 Heating DD: 6911 Days above 90 (T090): 6.8 Days above 100 (T100): 0.0 Days below 0 (T000): 10.2 Days below 32 (T032): 137.8 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.53 1.97 2.55 3.21 4.21 4.05 3.82 4.19 3.48 2.92 2.65 1.97 Snow: 10.9 11.0 5.5 1.3 0.0 0.0 0.0 0.0 0.0 0.0 1.0 13.5 Number of Days P001: 9.8 9.5 10.5 11.2 12.7 12.8 9.9 9.7 8.3 10.1 9.6 11.4 P010: 4.0 4.9 5.5 7.3 8.5 7.3 5.6 5.8 5.4 5.8 4.3 5.8 P100: 0.1 0.3 0.5 0.7 1.0 1.2 1.1 1.3 0.8 0.5 0.4 0.3 S001: 8.4 7.9 4.5 0.8 0.0 0.0 0.0 0.0 0.0 0.0 1.6 9.0 S010: 3.0 3.4 1.5 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.4 4.3 S100: 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 36.55 inches Snowfall: 43.2 inches Days precipitation at or above 0 inches (P000): 125.5 Days precipitation at or above 0.10 inches (P010): 70.2 Days Precipitation at or above 1.00 inches (P100): 8.2 Days Snowfall at or above 0.1 inches (S001): 32.2 Days Snowfall at or above 1.0 inches (S010): 13.1 Days Snowfall at or above 10.0 inches (S100): 0.3 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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