Official 1981-2010 Climate Normals City: STREAMWOOD State: IL ID: 118324 Latitude: 42.0256 Longitude: -88.1783 Elevation: 818.7 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 31.9 36.4 47.7 61.0 72.6 83.3 86.7 85.0 76.8 64.4 49.8 35.5 Mean: 21.3 25.0 35.3 46.9 57.8 68.4 72.6 71.1 62.4 50.6 38.2 25.0 Low: 10.6 13.5 22.8 32.9 42.9 53.5 58.6 57.2 47.9 36.8 26.5 14.6 CDD: 0 0 0 4 34 156 246 203 63 7 0 0 HDD: 1356 1121 922 545 259 54 9 14 143 454 806 1238 Number of Days T090: 0.0 0.0 0.0 0.1 1.7 7.4 9.7 6.9 2.0 0.1 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.2 0.1 0.0 0.0 0.0 0.0 T000: 6.2 3.5 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.8 T032: 30.5 27.2 25.5 13.9 3.2 0.1 0.0 0.0 0.5 9.5 21.6 29.5 ------------------------------------------------------------------------------------------ Annual Values High Temp: 61.0 F Mean Temp: 48.0 F Low Temp: 34.9 F Cooling DD: 713 Heating DD: 6921 Days above 90 (T090): 27.8 Days above 100 (T100): 0.4 Days below 0 (T000): 13.8 Days below 32 (T032): 161.5 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.71 1.62 2.30 3.15 4.31 3.92 4.29 4.67 3.60 3.30 3.03 2.07 Snow: 11.9 6.0 5.1 0.7 0.0 0.0 0.0 0.0 0.0 0.1 1.8 8.7 Number of Days P001: 10.5 8.9 10.8 12.5 13.2 11.8 9.3 10.6 7.9 10.3 10.5 12.0 P010: 5.3 4.1 5.4 7.5 8.3 7.2 6.1 6.4 4.9 5.8 4.8 5.4 P100: 0.2 0.2 0.3 0.7 1.1 0.9 0.6 1.5 0.9 0.5 0.6 0.2 S001: 9.0 6.6 4.3 1.1 0.0 0.0 0.0 0.0 0.0 0.2 2.3 8.8 S010: 3.8 2.1 1.6 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.6 3.4 S100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 37.97 inches Snowfall: 34.3 inches Days precipitation at or above 0 inches (P000): 128.3 Days precipitation at or above 0.10 inches (P010): 71.2 Days Precipitation at or above 1.00 inches (P100): 7.7 Days Snowfall at or above 0.1 inches (S001): 32.3 Days Snowfall at or above 1.0 inches (S010): 11.9 Days Snowfall at or above 10.0 inches (S100): 0.1 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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