Swansea Illinois Climate Data

Monthly Average Climate Data for Swansea Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January23.7 °F39.9 °F2.84 in.
February26.9 °F45.3 °F2.45 in.
March35.8 °F55.5 °F3.61 in.
April46.5 °F67.4 °F5.0 in.
May57.4 °F76.4 °F5.23 in.
June66.2 °F85.3 °F5.16 in.
July69.7 °F88.5 °F4.4 in.
August68.0 °F87.3 °F3.81 in.
September59.5 °F80.8 °F3.39 in.
October48.4 °F69.3 °F3.24 in.
November36.9 °F55.1 °F3.75 in.
December28.3 °F44.3 °F2.89 in.
Annual47.3 °F66.3 °F45.77 in.

Climate Data for Swansea Illinois

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCfa - Humid Subtropical Climate
2024 plantmaps.com