Weather

Great Lakes Naval Station, Illinois, weather forecast

Illinois is occasionally known to have tornadoes from time to time.  The National Weather Service issues two types of alerts during periods of severe storms.  The first alert is a Tornado Watch.  A Tornado Watch means conditions are favorable for the formation of a tornado.  The second alert is a Tornado Warning.  A Tornado Warning is issued when a tornado funnel cloud has been spotted  or a tornado is found by weather radar.  Emergency sirens are activated during a Tornado Warning.  Upon hearing the sirens or being notified by TV or radio you should seek shelter. For more information on tornados please read the NOAA Tornado Guide.

Great Lakes Naval Station Average Temperatures and Precipitation


  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
High 30 35 46 58 70 79 84 81 74 62 47 34
Low 14 19 29 38 48 57 63 62 54 42 32 20
Average 22 27 37 48 59 68 73 72 64 52 39 27
Precip. (in) 1.8 1.6 2.7 3.7 3.4 3.6 3.5 4.6 3.3 2.7 3.0 2.4
Snow (in) 11.3 8.3 6.0 1.6 0.0 0.0 0.0 0.0 0.0 0.3 1.8 8.7
Note: Precipitation between the months of October and April maybe either rain or snow.