Official 1981-2010 Climate Normals City: CHICAGO NORTHERLY IS State: IL ID: 111550 Latitude: 41.8661 Longitude: -87.6153 Elevation: 591.7 ft Temperature-Related Pseudonormals For stations with short records, linear combinations of normals from nearby sites were used to compute so-called pseudonormals. Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 32.2 36.4 45.8 56.9 67.8 77.1 83.4 81.5 74.5 62.8 49.2 36.3 Mean: 26.0 29.7 38.4 49.6 59.8 69.5 76.5 75.1 67.8 56.0 43.4 30.6 Low: 19.8 22.9 30.9 42.2 51.7 61.9 69.5 68.6 61.1 49.2 37.5 24.9 CDD: 0 0 0 3 31 172 355 312 130 22 0 0 HDD: 1209 990 826 466 194 37 0 1 46 301 650 1066 Number of Days T090: 0.0 0.0 0.0 0.0 0.2 1.4 3.8 2.3 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: 0.8 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 T032: 27.0 23.4 17.3 2.7 0.0 0.0 0.0 0.0 0.0 0.2 7.0 24.4 ------------------------------------------------------------------------------------------ Annual Values High Temp: 58.8 F Mean Temp: 51.9 F Low Temp: 45.1 F Cooling DD: 1025 Heating DD: 5786 Days above 90 (T090): 8.0 Days above 100 (T100): 0.0 Days below 0 (T000): 1.7 Days below 32 (T032): 102.0 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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