Official 1981-2010 Climate Normals City: QUINCY DAM 21 State: IL ID: 117077 Latitude: 39.9058 Longitude: -91.4281 Elevation: 482.8 ft Temperature-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 35.2 40.4 51.6 64.2 73.7 83.0 86.9 85.7 78.1 66.5 52.6 38.5 Mean: 27.1 31.6 41.8 53.5 63.7 72.9 77.0 75.6 67.3 55.7 43.6 30.6 Low: 19.0 22.9 31.9 42.8 53.6 62.9 67.2 65.6 56.5 44.9 34.6 22.7 CDD: 0 0 2 17 79 251 374 333 137 21 1 0 HDD: 1175 934 723 362 120 13 0 3 68 310 643 1066 Number of Days T090: 0.0 0.0 0.0 0.0 0.5 5.4 9.9 8.1 2.2 0.2 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.1 0.7 0.8 0.0 0.0 0.0 0.0 T000: 2.0 1.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.2 T032: 27.1 21.9 16.3 2.9 0.0 0.0 0.0 0.0 0.0 1.9 12.1 24.7 ------------------------------------------------------------------------------------------ Annual Values High Temp: 63.1 F Mean Temp: 53.5 F Low Temp: 43.8 F Cooling DD: 1216 Heating DD: 5417 Days above 90 (T090): 26.4 Days above 100 (T100): 1.6 Days below 0 (T000): 4.5 Days below 32 (T032): 107.1 ------------------------------------------------------------------------------------------ Precipitation-Related Normals Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 1.48 1.85 2.63 3.71 4.59 3.86 4.25 3.49 3.15 2.83 2.77 2.10 Number of Days P001: 6.1 6.2 8.9 10.3 10.1 9.3 8.2 7.4 6.7 7.7 7.7 7.7 P010: 2.9 4.1 5.5 7.2 7.4 6.8 6.3 5.3 4.8 5.2 5.2 4.5 P100: 0.4 0.4 0.5 0.8 1.4 1.0 1.2 0.9 0.9 0.4 0.6 0.5 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 36.71 inches Days precipitation at or above 0 inches (P000): 96.3 Days precipitation at or above 0.10 inches (P010): 65.2 Days Precipitation at or above 1.00 inches (P100): 9.0 ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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