Deerfield, Illinois Climate
United States
Pop. 19,019 Elev. 214 m / 702 ft
TZ: America/Chicago (UTC-5) ·
Deerfield has a dry climate with warm summers reaching 77°F (25°C) in July and cold winters averaging 21°F (-6°C) in January. Wind chill can push winter lows to 10°F (-12°C). Rain falls on about 42 days per year (30.3 in / 769 mm total), with snow on 6 days and 45 in (1144 mm) of annual accumulation. The city averages 116 sunny days per year and around 27 thunderstorm days. Ocean water temperatures reach 75°F (24°C) in summer.
| Temperature | 77°F (25°C) high | 21°F (-6°C) low |
| Feels like | 10°F (-12°C) low | |
| Rain | 42 days | 30.3 in (769 mm) /yr |
| Snow | 6 days | 45.0 in (1144 mm) /yr |
| Sky | 116 sunny | 27 stormy |
| Wind | 3.9 mph (1.7 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 (%)
63
Jan 71
Feb 60
Mar 65
Apr 62
May 52
Jun 58
Jul 46
Aug 32
Sep 44
Oct 60
Nov 85
Dec Humidity (%)
64
Jan 71
Feb 72
Mar 78
Apr 85
May 83
Jun 85
Jul 76
Aug 77
Sep 71
Oct 70
Nov 77
Dec Weather Days by Month
Water Temperatures
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Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 14 mi Chicago O'Hare International Airport (ORD)
Ski resort 4 mi
National park 35 mi Pullman National Historical Park
Hospital 2 mi Highland Park Hospital
Hiking trail 3 mi OBT-8
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 31°F -1°C | 21°F -6°C | 0.9 in 23 mm | 5.3 in133 mm | 6 |
| February | 33°F 0°C | 23°F -5°C | 0.3 in 9 mm | 10.9 in277 mm | 3 |
| March | 46°F 8°C | 35°F 1°C | 3.4 in 87 mm | 5.2 in133 mm | 9 |
| April | 49°F 9°C | 40°F 5°C | 3.2 in 80 mm | 0.2 in5 mm | 5 |
| May | 53°F 11°C | 46°F 8°C | 3.9 in 98 mm | — | 9 |
| June | 69°F 21°C | 60°F 16°C | 4.1 in 105 mm | — | 10 |
| July | 77°F 25°C | 69°F 21°C | 4.0 in 101 mm | — | 10 |
| August | 75°F 24°C | 69°F 20°C | 2.0 in 51 mm | — | 18 |
| September | 70°F 21°C | 64°F 18°C | 0.8 in 21 mm | — | 18 |
| October | 62°F 17°C | 56°F 13°C | 2.9 in 75 mm | — | 17 |
| November | 48°F 9°C | 41°F 5°C | 1.8 in 44 mm | 14.8 in375 mm | 10 |
| December | 35°F 2°C | 26°F -3°C | 2.9 in 75 mm | 8.7 in221 mm | 1 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 6 | 1 |
| February | 3 | 0 |
| March | 9 | 4 |
| April | 5 | 1 |
| May | 9 | 3 |
| June | 10 | 3 |
| July | 10 | 6 |
| August | 18 | 4 |
| September | 18 | 1 |
| October | 17 | 2 |
| November | 10 | 1 |
| December | 1 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 37°F 3°C | 34°F 1°C |
| February | 35°F 1°C | 33°F 1°C |
| March | 37°F 3°C | 36°F 2°C |
| April | 44°F 7°C | 41°F 5°C |
| May | 49°F 9°C | 48°F 9°C |
| June | 67°F 20°C | 61°F 16°C |
| July | 75°F 24°C | 74°F 23°C |
| August | 74°F 24°C | 75°F 24°C |
| September | 69°F 21°C | 69°F 21°C |
| October | 67°F 20°C | 61°F 16°C |
| November | 52°F 11°C | 48°F 9°C |
| December | 43°F 6°C | 38°F 4°C |