Algonquin, Illinois Climate
United States
Pop. 30,571 Elev. 227 m / 745 ft
TZ: America/Chicago (UTC-5) ·
Algonquin has a dry climate with warm summers reaching 84°F (29°C) in July and cold winters averaging 15°F (-9°C) in January. Humidity pushes the summer feels-like temperature to 92°F (33°C), while wind chill can drive winter lows to 5°F (-15°C). Rain falls on about 40 days per year (30.1 in / 763 mm total), with snow on 5 days and 34 in (875 mm) of annual accumulation. The city averages 119 sunny days per year and around 27 thunderstorm days. Ocean water temperatures reach 74°F (23°C) in summer.
| Temperature | 84°F (29°C) high | 15°F (-9°C) low |
| Feels like | 92°F (34°C) high | 5°F (-15°C) low |
| Rain | 40 days | 30.1 in (763 mm) /yr |
| Snow | 5 days | 34.4 in (875 mm) /yr |
| Sky | 119 sunny | 27 stormy |
| Wind | 2.5 mph (1.1 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Aug, Sep, Oct
Sky & Air by Month
Cloud cover (%)
54
Jan 63
Feb 58
Mar 67
Apr 61
May 53
Jun 60
Jul 49
Aug 35
Sep 46
Oct 58
Nov 77
Dec Humidity (%)
59
Jan 65
Feb 59
Mar 61
Apr 65
May 66
Jun 73
Jul 73
Aug 70
Sep 70
Oct 68
Nov 73
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 24 mi Chicago O'Hare International Airport (ORD)
Ski resort 5 mi Norge Ski Club
National park 48 mi Historic Pullman Foundation Exhibit Hall
Hospital 4 mi Mercyhealth Hospital and Physician Clinic
Hiking trail 1 mi Pink Trail
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 30°F -1°C | 15°F -9°C | 0.7 in 18 mm | 3.1 in79 mm | 12 |
| February | 33°F 1°C | 18°F -8°C | 0.2 in 6 mm | 8.9 in225 mm | 6 |
| March | 56°F 13°C | 34°F 1°C | 3.2 in 80 mm | 5.0 in128 mm | 9 |
| April | 60°F 15°C | 42°F 6°C | 3.0 in 76 mm | 0.1 in4 mm | 5 |
| May | 66°F 19°C | 49°F 9°C | 3.7 in 93 mm | — | 9 |
| June | 82°F 28°C | 63°F 17°C | 4.2 in 105 mm | — | 10 |
| July | 84°F 29°C | 69°F 20°C | 4.9 in 124 mm | — | 7 |
| August | 79°F 26°C | 63°F 17°C | 3.1 in 80 mm | — | 14 |
| September | 76°F 25°C | 57°F 14°C | 2.4 in 60 mm | — | 18 |
| October | 64°F 18°C | 49°F 9°C | 2.0 in 51 mm | — | 16 |
| November | 49°F 9°C | 35°F 2°C | 1.1 in 29 mm | 9.8 in249 mm | 10 |
| December | 34°F 1°C | 20°F -7°C | 1.6 in 40 mm | 7.5 in191 mm | 3 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 12 | 1 |
| February | 6 | 0 |
| March | 9 | 3 |
| April | 5 | 1 |
| May | 9 | 3 |
| June | 10 | 2 |
| July | 7 | 5 |
| August | 14 | 5 |
| September | 18 | 4 |
| October | 16 | 2 |
| November | 10 | 0 |
| December | 3 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 38°F 3°C | 33°F 0°C |
| February | 34°F 1°C | 32°F 0°C |
| March | 36°F 2°C | 37°F 3°C |
| April | 42°F 6°C | 46°F 8°C |
| May | 48°F 9°C | 53°F 12°C |
| June | 66°F 19°C | 65°F 19°C |
| July | 74°F 23°C | 75°F 24°C |
| August | 73°F 23°C | 73°F 23°C |
| September | 69°F 20°C | 66°F 19°C |
| October | 67°F 19°C | 59°F 15°C |
| November | 51°F 11°C | 44°F 7°C |
| December | 43°F 6°C | 34°F 1°C |