Official 1981-2010 Climate Normals City: CHICAGO UNIV State: IL ID: 014892 Latitude: 41.7833 Longitude: -87.6000 Elevation: 594.0 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 33.8 38.0 47.7 59.6 70.3 80.4 84.6 83.2 76.6 64.8 50.8 37.3 Mean: 27.3 31.2 40.1 50.7 61.0 70.8 76.0 74.9 67.8 56.2 44.2 31.1 Low: 20.9 24.4 32.6 41.8 51.7 61.3 67.4 66.6 59.0 47.5 37.7 24.9 CDD: 0 0 1 13 64 209 342 309 144 18 1 0 HDD: 1167 946 772 442 188 34 1 2 60 292 623 1051 Number of Days T090: 0.0 0.0 0.0 0.1 0.7 3.2 7.1 5.1 1.9 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.3 0.5 0.0 0.0 0.0 0.0 0.0 T000: 2.0 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.2 T032: 25.9 20.6 14.0 2.9 0.0 0.0 0.0 0.0 0.0 0.6 8.2 21.0 ------------------------------------------------------------------------------------------ Annual Values High Temp: 60.7 F Mean Temp: 52.7 F Low Temp: 44.7 F Cooling DD: 1102 Heating DD: 5579 Days above 90 (T090): 18.2 Days above 100 (T100): 0.8 Days below 0 (T000): 3.9 Days below 32 (T032): 93.3 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.25 2.04 2.79 3.35 4.07 4.05 3.78 3.81 3.13 2.88 3.23 2.58 Number of Days P001: 9.4 8.4 11.9 11.1 11.0 9.7 10.4 9.4 10.4 10.6 12.2 11.3 P010: 4.9 5.0 6.6 6.6 6.6 6.3 6.6 6.0 6.6 5.3 7.6 5.8 P100: 0.2 0.2 0.4 0.6 0.7 0.8 0.9 0.9 0.7 0.7 1.5 0.4 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 37.96 inches Days precipitation at or above 0 inches (P000): 125.8 Days precipitation at or above 0.10 inches (P010): 73.9 Days Precipitation at or above 1.00 inches (P100): 8.0 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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