Waterloo, Illinois Climate
United States
Pop. 10,236 Elev. 216 m / 709 ft
TZ: America/Chicago (UTC-5) ·
Waterloo sees warm summers peaking at 89°F (32°C) in July, and frigid winters that bottom out around 22°F (-6°C) in January. Humidity pushes the summer feels-like temperature to around 107°F (42°C). Precipitation occurs on roughly 61 days per year (44.8 in / 1137 mm total), with snow on 5 days and 23 in (594 mm) of annual accumulation. The city averages 125 sunny days per year and around 49 thunderstorm days. Nearby lake water reaches 83°F (28°C) in summer.
| Temperature | 89°F (32°C) high | 22°F (-5°C) low |
| Feels like | 107°F (42°C) high | 17°F (-8°C) low |
| Rain | 61 days | 44.8 in (1137 mm) /yr |
| Snow | 5 days | 23.4 in (594 mm) /yr |
| Sky | 125 sunny | 49 stormy |
| Wind | 2.2 mph (1.0 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Mar, Aug, Oct
Sky & Air by Month
Cloud cover (%)
47
Jan 60
Feb 52
Mar 66
Apr 65
May 58
Jun 58
Jul 45
Aug 43
Sep 41
Oct 54
Nov 55
Dec Humidity (%)
62
Jan 66
Feb 49
Mar 63
Apr 68
May 74
Jun 77
Jul 67
Aug 63
Sep 68
Oct 67
Nov 69
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 22 mi Scott AFB/Midamerica Airport (BLV)
Ski resort 31 mi Hidden Valley
National park 72 mi Emmett Till and Mamie Till-Mobley National Monument
Hospital 12 mi Red Bud Regional Hospital
Hiking trail 19 mi ADT - Illinois (South) - J - Seg 3
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 38°F 3°C | 22°F -5°C | 1.6 in 40 mm | 8.4 in214 mm | 14 |
| February | 45°F 7°C | 27°F -3°C | 1.2 in 30 mm | 9.7 in245 mm | 8 |
| March | 67°F 19°C | 43°F 6°C | 2.8 in 71 mm | 0.3 in7 mm | 11 |
| April | 71°F 21°C | 50°F 10°C | 6.8 in 172 mm | 0.0 in1 mm | 5 |
| May | 74°F 23°C | 57°F 14°C | 5.5 in 140 mm | — | 9 |
| June | 85°F 29°C | 70°F 21°C | 8.7 in 221 mm | — | 8 |
| July | 89°F 32°C | 74°F 23°C | 4.4 in 112 mm | — | 8 |
| August | 86°F 30°C | 66°F 19°C | 0.6 in 16 mm | — | 14 |
| September | 84°F 29°C | 60°F 15°C | 5.8 in 148 mm | — | 14 |
| October | 72°F 22°C | 52°F 11°C | 4.1 in 103 mm | — | 16 |
| November | 59°F 15°C | 41°F 5°C | 2.8 in 70 mm | 3.2 in82 mm | 9 |
| December | 47°F 8°C | 31°F -1°C | 0.5 in 13 mm | 1.8 in46 mm | 9 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 14 | 1 |
| February | 8 | 1 |
| March | 11 | 4 |
| April | 5 | 7 |
| May | 9 | 7 |
| June | 8 | 10 |
| July | 8 | 6 |
| August | 14 | 1 |
| September | 14 | 5 |
| October | 16 | 3 |
| November | 9 | 4 |
| December | 9 | 0 |
Water Temperatures Data
↑ See chart| Month | Lake Avg High |
|---|---|
| January | 33°F 0°C |
| February | 32°F 0°C |
| March | 49°F 9°C |
| April | 58°F 15°C |
| May | 65°F 18°C |
| June | 77°F 25°C |
| July | 83°F 28°C |
| August | 77°F 25°C |
| September | 72°F 22°C |
| October | 62°F 17°C |
| November | 46°F 8°C |
| December | 34°F 1°C |