Official 1981-2010 Climate Normals City: RAMSEY State: IL ID: 117126 Latitude: 39.1483 Longitude: -89.1022 Elevation: 599.9 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 35.7 40.9 52.0 64.4 74.0 82.9 86.1 85.9 79.3 67.2 52.9 39.2 Mean: 27.4 31.9 42.0 53.1 63.0 72.2 75.6 74.1 66.5 54.9 43.3 31.0 Low: 19.1 22.8 32.0 41.9 52.0 61.4 65.0 62.3 53.8 42.5 33.6 22.9 CDD: 0 0 1 12 72 231 328 286 118 16 1 0 HDD: 1165 928 714 367 134 17 1 4 71 331 653 1052 Number of Days T090: 0.0 0.0 0.0 0.0 0.4 4.3 7.8 8.0 2.8 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.2 0.0 0.0 0.0 0.0 T000: 2.7 0.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.7 T032: 26.0 23.2 17.0 4.4 0.3 0.0 0.0 0.0 0.2 4.7 14.0 25.6 ------------------------------------------------------------------------------------------ Annual Values High Temp: 63.5 F Mean Temp: 53.0 F Low Temp: 42.5 F Cooling DD: 1065 Heating DD: 5438 Days above 90 (T090): 23.2 Days above 100 (T100): 0.2 Days below 0 (T000): 4.4 Days below 32 (T032): 115.3 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.44 2.12 3.00 3.60 4.80 3.97 4.11 3.06 3.15 3.42 3.91 2.94 Snow: 3.5 3.7 0.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.4 4.1 Number of Days P001: 8.7 7.7 10.1 10.1 11.4 9.2 8.7 8.0 6.9 8.9 10.0 9.6 P010: 4.8 4.1 6.5 7.0 8.1 6.7 6.4 5.4 4.8 5.9 7.2 5.6 P100: 0.6 0.4 0.6 0.9 1.3 1.1 1.2 0.9 1.1 0.9 1.1 0.8 S001: 3.8 2.6 1.1 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.4 3.0 S010: 1.6 1.1 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 1.3 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: 40.52 inches Snowfall: 12.5 inches Days precipitation at or above 0 inches (P000): 109.3 Days precipitation at or above 0.10 inches (P010): 72.5 Days Precipitation at or above 1.00 inches (P100): 10.9 Days Snowfall at or above 0.1 inches (S001): 11.1 Days Snowfall at or above 1.0 inches (S010): 4.5 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