Official 1981-2010 Climate Normals City: SAYBROOK 2N State: IL ID: 117590 Latitude: 40.4536 Longitude: -88.5364 Elevation: 799.7 ft Temperature-Related Pseudonormals For stations with short records, linear combinations of normals from nearby sites were used to compute so-called pseudonormals. Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High: 31.5 36.0 48.3 62.3 72.3 81.1 84.0 83.0 77.9 65.6 49.9 35.3 Mean: 23.3 27.6 38.3 50.6 61.3 70.4 73.3 71.6 64.8 53.3 40.5 27.3 Low: 15.0 19.1 28.3 38.8 50.2 59.7 62.5 60.2 51.6 41.0 31.0 19.3 CDD: 0 0 0 5 37 175 256 211 61 2 0 0 HDD: 1294 1048 828 439 153 14 0 7 69 365 737 1168 Number of Days T090: 0.0 0.0 0.0 0.0 0.0 0.0 3.7 3.3 0.8 0.0 0.0 0.0 T100: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 T000: 4.2 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.7 T032: 27.8 25.6 20.7 6.0 0.3 0.0 0.0 0.0 0.0 3.7 17.9 28.4 ------------------------------------------------------------------------------------------ Annual Values High Temp: 60.7 F Mean Temp: 50.3 F Low Temp: 39.8 F Cooling DD: 746 Heating DD: 6120 Days above 90 (T090): 7.8 Days above 100 (T100): 0.0 Days below 0 (T000): 5.5 Days below 32 (T032): 130.4 ------------------------------------------------------------------------------------------ Precipitation-Related Pseudonormals For stations with short records, linear combinations of normals from nearby sites were used to compute so-called pseudonormals. Normal Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Prcp: 2.01 1.76 2.61 3.60 4.36 3.91 4.16 3.90 2.89 3.21 3.35 2.30 ------------------------------------------------------------------------------------------ Annual Values Precipitation: 38.06 inches ------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------ 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