Official 1981-2010 Climate Normals City: MARSEILLES LOCK State: IL ID: 115372 Latitude: 41.3286 Longitude: -88.7533 Elevation: 490.0 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 30.6 35.1 47.2 60.8 71.8 80.2 83.3 82.0 76.0 63.5 48.8 34.6 Mean: 22.3 26.3 37.2 49.3 60.0 69.0 72.5 71.1 64.0 52.1 39.7 26.5 Low: 14.0 17.6 27.3 37.7 48.2 57.9 61.7 60.3 52.0 40.8 30.6 18.4 CDD: 0 0 0 6 47 157 237 199 77 13 0 0 HDD: 1323 1082 860 478 202 35 4 9 108 411 759 1193 Number of Days T090: 0.0 0.0 0.0 0.0 0.8 2.5 3.0 2.1 1.1 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: 4.2 2.4 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.5 T032: 29.2 25.8 22.9 8.7 0.6 0.0 0.0 0.0 0.0 5.6 17.1 27.5 ------------------------------------------------------------------------------------------ Annual Values High Temp: 59.6 F Mean Temp: 49.3 F Low Temp: 39.0 F Cooling DD: 736 Heating DD: 6466 Days above 90 (T090): 9.5 Days above 100 (T100): 0.1 Days below 0 (T000): 9.2 Days below 32 (T032): 137.4 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.82 1.64 2.72 3.33 4.28 4.19 4.13 4.12 3.47 3.01 3.32 2.34 Snow: 8.0 6.2 2.3 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.5 5.8 Number of Days P001: 9.9 8.7 10.8 11.3 11.2 10.5 9.3 9.2 8.5 9.0 10.4 11.4 P010: 4.8 4.0 6.0 7.0 7.8 7.3 6.5 6.4 5.6 5.8 6.1 5.4 P100: 0.3 0.2 0.5 0.7 1.1 1.2 1.3 1.2 1.0 0.6 0.9 0.4 S001: 4.9 3.8 1.6 0.3 0.0 0.0 0.0 0.0 0.0 0.1 0.5 4.2 S010: 2.9 2.2 0.8 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.2 2.5 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: 38.37 inches Snowfall: 23.3 inches Days precipitation at or above 0 inches (P000): 120.2 Days precipitation at or above 0.10 inches (P010): 72.7 Days Precipitation at or above 1.00 inches (P100): 9.4 Days Snowfall at or above 0.1 inches (S001): 15.4 Days Snowfall at or above 1.0 inches (S010): 8.8 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