Official 1981-2010 Climate Normals City: ANTIOCH State: IL ID: 110203 Latitude: 42.4811 Longitude: -88.0994 Elevation: 749.8 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 29.0 33.0 43.8 57.1 68.1 78.0 82.1 80.6 73.3 60.9 46.8 33.1 Mean: 21.5 25.2 35.3 47.3 57.7 67.7 72.3 71.0 63.4 50.9 39.0 25.9 Low: 13.9 17.3 26.8 37.5 47.4 57.4 62.5 61.3 53.4 41.0 31.1 18.6 CDD: 0 0 0 6 34 142 235 199 79 7 0 0 HDD: 1350 1116 921 537 259 61 9 15 129 443 782 1213 Number of Days T090: 0.0 0.0 0.0 0.0 0.3 1.8 3.5 2.6 0.4 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: 5.5 2.9 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.5 T032: 28.5 25.6 22.6 7.8 0.4 0.0 0.0 0.0 0.1 5.0 15.9 27.2 ------------------------------------------------------------------------------------------ Annual Values High Temp: 57.3 F Mean Temp: 48.2 F Low Temp: 39.1 F Cooling DD: 702 Heating DD: 6833 Days above 90 (T090): 8.6 Days above 100 (T100): 0.2 Days below 0 (T000): 11.2 Days below 32 (T032): 133.1 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.60 1.48 2.09 3.21 4.24 4.71 3.57 4.08 3.54 3.09 2.75 2.32 Snow: 12.7 9.8 6.1 1.5 0.0 0.0 0.0 0.0 0.0 0.0 1.5 11.1 Number of Days P001: 9.1 8.1 8.9 10.3 11.9 10.6 9.0 9.6 8.8 9.6 9.2 8.4 P010: 4.3 3.9 4.7 6.3 7.5 6.8 5.9 6.3 5.8 5.7 5.8 5.2 P100: 0.3 0.1 0.2 0.6 1.0 0.9 1.0 1.3 0.8 0.6 0.8 0.5 S001: 6.5 4.6 3.1 0.7 0.0 0.0 0.0 0.0 0.0 0.0 1.0 5.2 S010: 3.6 2.7 1.6 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.7 2.7 S100: 0.1 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 36.68 inches Snowfall: 42.7 inches Days precipitation at or above 0 inches (P000): 113.5 Days precipitation at or above 0.10 inches (P010): 68.2 Days Precipitation at or above 1.00 inches (P100): 8.1 Days Snowfall at or above 0.1 inches (S001): 21.1 Days Snowfall at or above 1.0 inches (S010): 11.7 Days Snowfall at or above 10.0 inches (S100): 0.2 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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