Sumner, IL
Climate overview — based on NOAA 1991-2020 normals from LAWRENCEVILLE 2WSW, IL US.
Year-round temperatures (°F)
Climate summary
Sumner has an annual average temperature of 54.9°F with about 46.6 inches of precipitation per year and 15.5 inches of snow. The warmest month is July (average high 88.3°F), and the coldest is January (average low 21.3°F). May is typically the wettest month (5.33 in) and February the driest (2.68 in). Snow typically falls from November through March.
Best time to visit Sumner
Full guide →Climate change signal
All-time records →85 of 366 (23.2%) of Sumner'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.
| 1960s | 23 | |
| 1970s | 0 | |
| 1980s | 0 | |
| 1990s | 93 | |
| 2000s | 94 | |
| 2010s | 115 | |
| 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 | 39.1°F | 21.3°F | 30.2°F | 3.26 in | 3.8 in | 10 |
| February | 44.0°F | 24.5°F | 34.3°F | 2.68 in | 4.2 in | 9 |
| March | 54.6°F | 32.7°F | 43.7°F | 3.62 in | 1.8 in | 10 |
| April | 66.6°F | 42.8°F | 54.7°F | 4.38 in | — | 10 |
| May | 76.8°F | 53.6°F | 65.2°F | 5.33 in | — | 11 |
| June | 85.7°F | 62.6°F | 74.1°F | 5.17 in | — | 10 |
| July | 88.3°F | 65.6°F | 77.0°F | 4.15 in | — | 8 |
| August | 87.1°F | 63.3°F | 75.2°F | 3.07 in | — | 7 |
| September | 81.7°F | 55.7°F | 68.7°F | 3.56 in | — | 7 |
| October | 69.5°F | 44.2°F | 56.8°F | 3.86 in | 0.1 in | 8 |
| November | 55.3°F | 34.0°F | 44.7°F | 4.09 in | 0.4 in | 9 |
| December | 43.5°F | 25.7°F | 34.6°F | 3.43 in | 5.2 in | 10 |
Climate twins of Sumner
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).