Lockport, IL
Climate overview — based on NOAA 1991-2020 normals from ROMEOVILLE WFO, IL US.
Year-round temperatures (°F)
Climate summary
Lockport has an annual average temperature of 50.9°F with about 41.1 inches of precipitation per year and 33.2 inches of snow. The warmest month is July (average high 84.7°F), and the coldest is January (average low 16.1°F). May is typically the wettest month (4.81 in) and February the driest (1.98 in). Snow typically falls from November through April.
Best time to visit Lockport
Full guide →Climate change signal
All-time records →123 of 366 (33.6%) of Lockport'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.
| 1990s | 35 | |
| 2000s | 138 | |
| 2010s | 113 | |
| 2020s | 80 |
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 | 31.7°F | 16.1°F | 23.9°F | 2.19 in | 10.6 in | 10 |
| February | 36.3°F | 19.7°F | 28.0°F | 1.98 in | 8.7 in | 10 |
| March | 48.5°F | 29.7°F | 39.1°F | 2.71 in | 4.2 in | 11 |
| April | 61.0°F | 39.6°F | 50.3°F | 4.11 in | 0.9 in | 12 |
| May | 72.4°F | 50.3°F | 61.4°F | 4.81 in | — | 14 |
| June | 81.5°F | 60.3°F | 70.9°F | 4.68 in | — | 12 |
| July | 84.7°F | 64.5°F | 74.6°F | 4.50 in | — | 10 |
| August | 82.7°F | 63.0°F | 72.8°F | 4.36 in | — | 10 |
| September | 76.4°F | 55.4°F | 65.9°F | 3.31 in | — | 8 |
| October | 63.8°F | 43.5°F | 53.7°F | 3.67 in | 0.1 in | 11 |
| November | 48.9°F | 31.9°F | 40.4°F | 2.67 in | 1.2 in | 9 |
| December | 36.8°F | 22.0°F | 29.4°F | 2.15 in | 7.5 in | 11 |
Climate twins of Lockport
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).