Charleston Climate Normals

Official 1981-2010 Climate Normals

City: CHARLESTON  
State: IL
ID: 111436
Latitude: 39.4761
Longitude: -88.1653
Elevation:  649.8 ft

Temperature-Related Normals

Normal    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
High:    36.4   41.7   53.2   65.7   75.0   83.8   86.4   85.0   79.1   67.1   53.3   39.7
Mean:    28.4   33.1   43.4   54.7   64.2   73.1   76.2   74.6   67.8   56.3   44.4   32.1
 Low:    20.5   24.4   33.5   43.7   53.3   62.4   66.1   64.3   56.4   45.5   35.6   24.5
 CDD:       0      0      3     21     87    255    349    302    144     24      1      0
 HDD:    1133    894    674    330    113     12      0      3     61    294    618   1020

Number of Days
T090:     0.0    0.0    0.0    0.0    0.5    5.3    7.7    6.8    2.2    0.1    0.0    0.0
T100:     0.0    0.0    0.0    0.0    0.0    0.0    0.1    0.1    0.0    0.0    0.0    0.0
T000:     2.3    0.9    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.0    1.0
T032:    25.5   21.3   14.6    3.9    0.2    0.0    0.0    0.0    0.0    2.6   11.3   22.6
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Annual Values

 High Temp:    64.0 F
 Mean Temp:    54.1 F
  Low Temp:    44.3 F
Cooling DD:    1186
Heating DD:    5153

Days above  90 (T090):    22.5
Days above 100 (T100):     0.3
Days below   0 (T000):     4.3
Days below  32 (T032):   102.0
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Precipitation-Related Normals

Normal    Jan    Feb    Mar    Apr    May    Jun    Jul    Aug    Sep    Oct    Nov    Dec
Prcp:    2.49   2.51   2.89   4.29   4.62   4.35   4.47   2.93   3.24   3.76   3.97   3.15
Snow:     7.5    4.4    1.8    0.2    0.0    0.0    0.0    0.0    0.0    0.0    0.7    2.6

Number of Days
P001:     9.1    8.2   10.6   11.4   11.5    9.0    9.0    8.0    7.1    8.7   10.2   10.6
P010:     5.1    5.0    6.6    8.1    8.2    6.4    6.2    5.3    4.9    5.7    7.1    6.7
P100:     0.6    0.5    0.5    0.9    1.1    1.1    1.3    0.9    0.8    1.1    1.0    0.7
S001:     4.7    2.7    1.4    0.2    0.0    0.0    0.0    0.0    0.0    0.0    0.5    3.6
S010:     3.5    1.7    0.8    0.0    0.0    0.0    0.0    0.0    0.0    0.0    0.2    2.0
S100:     0.1    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:   42.67 inches
     Snowfall:    17.2 inches

   Days precipitation at or above 0 inches (P000):   113.4
Days precipitation at or above 0.10 inches (P010):    75.3
Days Precipitation at or above 1.00 inches (P100):    10.5
      Days Snowfall at or above 0.1 inches (S001):    13.1
      Days Snowfall at or above 1.0 inches (S010):     8.2
     Days Snowfall at or above 10.0 inches (S100):     0.1

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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