Official 1981-2010 Climate Normals City: MCHENRY-WG STRATTON LD State: IL ID: 115493 Latitude: 42.3103 Longitude: -88.2525 Elevation: 741.9 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 28.3 33.0 44.2 57.3 68.4 78.2 81.7 80.4 73.3 60.8 46.4 32.2 Mean: 20.1 24.5 35.1 47.2 57.7 67.3 71.4 70.1 62.3 49.7 38.0 24.6 Low: 11.9 16.1 26.1 37.0 47.0 56.3 61.1 59.7 51.2 38.6 29.6 17.1 CDD: 0 0 0 5 35 129 211 176 60 5 0 0 HDD: 1392 1132 926 540 261 62 13 19 143 480 810 1250 Number of Days T090: 0.0 0.0 0.0 0.0 0.4 1.7 2.5 2.1 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: 5.9 3.6 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.2 T032: 30.2 25.8 22.7 8.9 0.8 0.0 0.0 0.0 0.2 7.9 18.0 28.1 ------------------------------------------------------------------------------------------ Annual Values High Temp: 57.1 F Mean Temp: 47.4 F Low Temp: 37.8 F Cooling DD: 621 Heating DD: 7027 Days above 90 (T090): 7.2 Days above 100 (T100): 0.1 Days below 0 (T000): 13.0 Days below 32 (T032): 142.6 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.39 1.43 2.03 3.26 4.09 4.10 3.90 4.16 3.07 2.93 2.66 1.87 Snow: 10.9 8.1 4.1 0.7 0.0 0.0 0.0 0.0 0.0 0.0 1.3 9.2 Number of Days P001: 8.3 7.5 8.7 10.7 12.3 11.2 9.4 9.8 9.1 9.4 9.2 9.3 P010: 3.9 3.9 4.4 7.0 7.8 7.3 5.8 6.2 5.4 5.8 5.2 4.6 P100: 0.1 0.2 0.2 0.7 0.8 1.1 1.1 1.2 0.8 0.7 0.5 0.2 S001: 6.7 5.2 3.0 0.4 0.0 0.0 0.0 0.0 0.0 0.0 1.3 6.2 S010: 3.6 2.7 1.4 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.5 2.8 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: 34.89 inches Snowfall: 34.3 inches Days precipitation at or above 0 inches (P000): 114.9 Days precipitation at or above 0.10 inches (P010): 67.3 Days Precipitation at or above 1.00 inches (P100): 7.6 Days Snowfall at or above 0.1 inches (S001): 22.8 Days Snowfall at or above 1.0 inches (S010): 11.3 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