Official 1981-2010 Climate Normals City: CHICAGO PALWAUKEE AP State: IL ID: 004838 Latitude: 42.1208 Longitude: -87.9047 Elevation: 636.0 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 30.8 35.2 46.1 57.9 69.1 79.0 83.3 81.5 74.3 61.7 48.1 35.1 Mean: 23.7 27.8 37.5 47.8 58.3 68.4 73.6 72.3 64.3 52.2 40.0 28.0 Low: 16.6 20.4 28.9 37.6 47.5 57.8 63.8 63.1 54.3 42.6 32.0 20.9 CDD: 0 0 0 4 38 154 269 232 81 11 0 0 HDD: 1280 1041 853 522 245 52 4 6 102 409 749 1147 Number of Days T090: 0.0 0.0 0.0 0.0 0.7 2.7 4.8 3.0 0.6 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 T000: 2.7 1.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.9 T032: 29.0 24.7 20.5 7.7 0.4 0.0 0.0 0.0 0.0 3.1 15.1 26.4 ------------------------------------------------------------------------------------------ Annual Values High Temp: 58.6 F Mean Temp: 49.6 F Low Temp: 40.6 F Cooling DD: 789 Heating DD: 6410 Days above 90 (T090): 11.9 Days above 100 (T100): 0.1 Days below 0 (T000): 4.7 Days below 32 (T032): 126.9 ------------------------------------------------------------------------------------------ Precipitation-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 Prcp: 1.63 0.95 2.25 2.97 3.69 3.71 3.62 3.66 3.21 2.94 2.89 1.83 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 33.35 inches ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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