Official 1981-2010 Climate Normals

City: CHESTER  
State: IL
ID: 111491
Latitude: 37.9022
Longitude: -89.8308
Elevation:  428.0 ft



Precipitation-Related Normals

Normal    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
Prcp:    2.61   2.64   3.70   3.96   5.50   4.27   3.96   3.14   3.70   3.63   4.29   3.38
Snow:     4.2    4.0    1.3    0.1    0.0    0.0    0.0    0.0    0.0    0.0    0.3    3.4

Number of Days
P001:     6.5    7.0    8.9    9.6   10.8    8.3    7.3    6.9    6.3    7.6    8.1    7.9
P010:     5.0    5.3    6.7    7.5    7.8    6.5    6.0    5.1    5.1    6.0    6.2    6.3
P100:     0.6    0.6    1.0    1.0    1.8    1.3    1.0    1.0    1.0    0.9    1.3    0.9
S001:     1.9    1.8    0.4    0.1    0.0    0.0    0.0    0.0    0.0    0.0    0.2    1.3
S010:     1.5    1.4    0.3    0.1    0.0    0.0    0.0    0.0    0.0    0.0    0.1    1.1
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
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Annual Values

Precipitation:   44.78 inches
     Snowfall:    13.3 inches

   Days precipitation at or above 0 inches (P000):    95.2
Days precipitation at or above 0.10 inches (P010):    73.5
Days Precipitation at or above 1.00 inches (P100):    12.4
      Days Snowfall at or above 0.1 inches (S001):     5.7
      Days Snowfall at or above 1.0 inches (S010):     4.5
     Days Snowfall at or above 10.0 inches (S100):     0.0

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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