Alto Pass, IL
Climate overview — based on NOAA 1991-2020 normals from ANNA 2 NNE, IL US.
Year-round temperatures (°F)
Climate summary
Alto Pass has an annual average temperature of 58.5°F with about 51.1 inches of precipitation per year and 10.4 inches of snow. The warmest month is July (average high 89.7°F), and the coldest is January (average low 25.4°F). May is typically the wettest month (5.93 in) and August the driest (3.15 in). Snow typically falls from October through March.
Best time to visit Alto Pass
Full guide →Climate change signal
All-time records →4 of 366 (1.1%) of Alto Pass'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 | 26 | |
| 1900s | 61 | |
| 1910s | 81 | |
| 1920s | 40 | |
| 1930s | 48 | |
| 1940s | 10 | |
| 1950s | 20 | |
| 1960s | 16 | |
| 1970s | 6 | |
| 1980s | 16 | |
| 1990s | 10 | |
| 2000s | 10 | |
| 2010s | 18 | |
| 2020s | 4 |
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 | 45.2°F | 25.4°F | 35.3°F | 3.53 in | 2.6 in | 8 |
| February | 50.0°F | 29.1°F | 39.6°F | 3.40 in | 4.0 in | 8 |
| March | 60.8°F | 37.0°F | 48.9°F | 4.82 in | 0.9 in | 10 |
| April | 71.4°F | 46.4°F | 58.9°F | 5.63 in | — | 10 |
| May | 79.0°F | 56.1°F | 67.6°F | 5.93 in | — | 12 |
| June | 87.0°F | 64.7°F | 75.9°F | 4.95 in | — | 9 |
| July | 89.7°F | 68.7°F | 79.2°F | 3.70 in | — | 8 |
| August | 89.4°F | 67.0°F | 78.2°F | 3.15 in | — | 7 |
| September | 83.5°F | 59.2°F | 71.3°F | 3.49 in | — | 7 |
| October | 72.7°F | 47.5°F | 60.1°F | 3.89 in | 0.2 in | 9 |
| November | 59.0°F | 37.0°F | 48.0°F | 4.54 in | 0.1 in | 10 |
| December | 48.0°F | 29.7°F | 38.9°F | 4.10 in | 2.6 in | 10 |
Climate twins of Alto Pass
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).