Official 1981-2010 Climate Normals City: LANARK State: IL ID: 114879 Latitude: 42.0925 Longitude: -89.8422 Elevation: 829.8 ft Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.30 1.41 2.44 3.40 4.01 4.94 4.78 4.15 3.15 2.97 2.72 1.70 Number of Days P001: 6.8 6.9 8.6 9.6 12.1 11.8 9.2 8.7 7.4 8.5 7.7 8.8 P010: 3.1 3.8 4.9 7.4 7.1 7.9 6.5 6.1 5.1 4.5 4.2 4.2 P100: 0.3 0.2 0.6 1.4 1.0 1.8 1.8 1.2 0.8 0.7 0.3 0.3 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 36.97 inches Days precipitation at or above 0 inches (P000): 106.1 Days precipitation at or above 0.10 inches (P010): 64.8 Days Precipitation at or above 1.00 inches (P100): 10.4 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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