Official 1981-2010 Climate Normals City: DU QUOIN 4 State: IL ID: 112483 Latitude: 37.9878 Longitude: -89.1931 Elevation: 419.8 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 40.9 46.1 56.8 67.9 76.7 85.1 88.2 87.7 80.6 69.7 56.6 43.6 Mean: 32.4 36.9 46.5 57.0 66.2 74.7 77.9 76.4 68.6 57.7 46.5 35.1 Low: 23.9 27.7 36.2 46.1 55.6 64.3 67.6 65.1 56.5 45.8 36.4 26.7 CDD: 0 0 4 30 113 296 400 355 156 29 3 0 HDD: 1010 787 577 270 77 5 0 1 50 254 558 925 Number of Days T090: 0.0 0.0 0.0 0.0 0.7 7.1 12.0 10.7 3.4 0.1 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.3 0.4 0.0 0.0 0.0 0.0 T000: 0.9 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.6 T032: 23.9 18.4 11.0 2.0 0.0 0.0 0.0 0.0 0.1 2.5 10.9 21.6 ------------------------------------------------------------------------------------------ Annual Values High Temp: 66.8 F Mean Temp: 56.4 F Low Temp: 46.1 F Cooling DD: 1386 Heating DD: 4515 Days above 90 (T090): 34.1 Days above 100 (T100): 0.9 Days below 0 (T000): 1.9 Days below 32 (T032): 90.4 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.92 2.74 4.16 4.26 5.71 4.51 3.86 3.14 3.36 3.86 4.23 3.55 Snow: 3.7 3.7 0.8 0.2 0.0 0.0 0.0 0.0 0.0 0.2 0.2 3.6 Number of Days P001: 7.2 6.7 9.2 9.9 10.4 8.7 7.3 7.0 6.6 7.5 8.4 8.1 P010: 5.4 5.2 7.2 7.9 7.9 6.8 5.6 5.5 5.2 6.2 6.6 6.3 P100: 0.8 0.6 0.9 1.0 2.0 1.1 1.1 1.0 1.0 1.0 1.2 0.8 S001: 2.1 1.9 0.4 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.1 1.5 S010: 1.6 1.6 0.3 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.1 1.2 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: 46.30 inches Snowfall: 12.4 inches Days precipitation at or above 0 inches (P000): 97.0 Days precipitation at or above 0.10 inches (P010): 75.8 Days Precipitation at or above 1.00 inches (P100): 12.5 Days Snowfall at or above 0.1 inches (S001): 6.2 Days Snowfall at or above 1.0 inches (S010): 5.0 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