Thomson, IL
Climate overview — based on NOAA 1991-2020 normals from FULTON L&D #13, IL US.
Year-round temperatures (°F)
Climate summary
Thomson has an annual average temperature of 49.9°F with about 34.3 inches of precipitation per year. The warmest month is July (average high 84.0°F), and the coldest is January (average low 13.6°F). June is typically the wettest month (4.52 in) and January the driest (1.40 in).
Best time to visit Thomson
Full guide →Climate change signal
All-time records →66 of 366 (18%) of Thomson'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.
| 1930s | 18 | |
| 1940s | 37 | |
| 1950s | 37 | |
| 1960s | 39 | |
| 1970s | 22 | |
| 1980s | 53 | |
| 1990s | 30 | |
| 2000s | 38 | |
| 2010s | 51 | |
| 2020s | 41 |
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 | 29.3°F | 13.6°F | 21.4°F | 1.40 in | — | 7 |
| February | 33.8°F | 17.1°F | 25.4°F | 1.56 in | — | 6 |
| March | 45.7°F | 28.2°F | 36.9°F | 2.41 in | — | 8 |
| April | 59.4°F | 39.8°F | 49.6°F | 3.39 in | — | 10 |
| May | 71.1°F | 51.4°F | 61.2°F | 4.03 in | — | 11 |
| June | 80.7°F | 61.7°F | 71.2°F | 4.52 in | — | 11 |
| July | 84.0°F | 65.2°F | 74.6°F | 3.40 in | — | 8 |
| August | 82.1°F | 63.2°F | 72.7°F | 3.43 in | — | 8 |
| September | 75.9°F | 55.2°F | 65.5°F | 3.66 in | — | 8 |
| October | 63.0°F | 43.4°F | 53.2°F | 2.58 in | — | 8 |
| November | 47.6°F | 31.4°F | 39.5°F | 2.20 in | — | 7 |
| December | 34.8°F | 20.5°F | 27.7°F | 1.69 in | — | 7 |
Climate twins of Thomson
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).