Forsyth, IL
Climate overview — based on NOAA 1991-2020 normals from DECATUR WTP, IL US.
Year-round temperatures (°F)
Climate summary
Forsyth has an annual average temperature of 53°F with about 40.4 inches of precipitation per year and 13.6 inches of snow. The warmest month is July (average high 84.7°F), and the coldest is January (average low 19.7°F). May is typically the wettest month (4.95 in) and February the driest (2.00 in). Snow typically falls from November through April.
Best time to visit Forsyth
Full guide →Climate change signal
All-time records →9 of 366 (2.5%) of Forsyth's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1890s | 33 | |
| 1900s | 19 | |
| 1910s | 36 | |
| 1920s | 41 | |
| 1930s | 82 | |
| 1940s | 24 | |
| 1950s | 39 | |
| 1960s | 10 | |
| 1970s | 15 | |
| 1980s | 31 | |
| 1990s | 11 | |
| 2000s | 14 | |
| 2010s | 6 | |
| 2020s | 5 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 34.0°F | 19.7°F | 26.9°F | 2.40 in | 5.9 in | 9 |
| February | 39.1°F | 23.5°F | 31.3°F | 2.00 in | 2.5 in | 8 |
| March | 50.8°F | 32.8°F | 41.8°F | 2.64 in | 0.9 in | 10 |
| April | 63.4°F | 43.3°F | 53.3°F | 4.12 in | 0.4 in | 11 |
| May | 73.5°F | 53.8°F | 63.7°F | 4.95 in | — | 13 |
| June | 82.2°F | 63.1°F | 72.6°F | 4.73 in | — | 11 |
| July | 84.7°F | 66.5°F | 75.6°F | 4.00 in | — | 10 |
| August | 83.5°F | 64.9°F | 74.2°F | 3.50 in | — | 7 |
| September | 77.7°F | 57.0°F | 67.3°F | 3.08 in | — | 8 |
| October | 65.3°F | 45.7°F | 55.5°F | 3.41 in | — | 10 |
| November | 50.3°F | 34.3°F | 42.3°F | 3.21 in | 0.4 in | 9 |
| December | 38.6°F | 25.0°F | 31.8°F | 2.40 in | 3.5 in | 9 |
Climate twins of Forsyth
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).