Lanark, Illinois Climate
United States
Pop. 1,373 Elev. 269 m / 883 ft
TZ: America/Chicago (UTC-5) ·
Dry and warm, Lanark sees July highs of 85°F (29°C) and cold January lows of 14°F (-10°C). Humidity pushes the summer feels-like temperature to 95°F (35°C), while wind chill can drive winter lows to 6°F (-14°C). Expect around 40 rainy days annually (30.3 in / 771 mm total), with snow on 5 days and 34 in (869 mm) of annual accumulation. The city averages 118 sunny days per year and around 30 thunderstorm days. Nearby lake water reaches 77°F (25°C) in summer.
| Temperature | 85°F (29°C) high | 14°F (-10°C) low |
| Feels like | 95°F (35°C) high | 6°F (-15°C) low |
| Rain | 40 days | 30.3 in (771 mm) /yr |
| Snow | 5 days | 34.2 in (869 mm) /yr |
| Sky | 118 sunny | 30 stormy |
| Wind | 2.4 mph (1.1 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: May, Sep, Oct
Sky & Air by Month
Cloud cover (%)
51
Jan 62
Feb 53
Mar 67
Apr 57
May 53
Jun 60
Jul 53
Aug 41
Sep 45
Oct 56
Nov 75
Dec Humidity (%)
61
Jan 66
Feb 60
Mar 60
Apr 59
May 65
Jun 75
Jul 74
Aug 64
Sep 62
Oct 66
Nov 78
Dec Weather Days by Month
Water Temperatures
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Nearby
Commercial airport 38 mi Chicago Rockford International Airport (RFD)
Ski resort 32 mi Chestnut Mountain Resort
National park 93 mi Pikes Peak State Park
Hospital 17 mi MercyHealth FHN Memorial Hospital
Hiking trail 16 mi Mississippi Palisades State Park Trails south
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 30°F -1°C | 14°F -10°C | 0.9 in 23 mm | 2.4 in60 mm | 14 |
| February | 33°F 1°C | 17°F -8°C | 0.1 in 3 mm | 6.7 in170 mm | 7 |
| March | 56°F 14°C | 34°F 1°C | 3.6 in 92 mm | 7.5 in189 mm | 10 |
| April | 62°F 17°C | 43°F 6°C | 3.5 in 89 mm | — | 4 |
| May | 71°F 22°C | 51°F 10°C | 3.2 in 81 mm | — | 12 |
| June | 84°F 29°C | 65°F 18°C | 4.5 in 116 mm | — | 10 |
| July | 85°F 29°C | 69°F 21°C | 5.4 in 137 mm | — | 7 |
| August | 80°F 27°C | 63°F 17°C | 3.8 in 97 mm | — | 13 |
| September | 80°F 26°C | 57°F 14°C | 1.1 in 28 mm | — | 15 |
| October | 68°F 20°C | 49°F 9°C | 1.7 in 42 mm | — | 12 |
| November | 50°F 10°C | 34°F 1°C | 1.0 in 26 mm | 10.6 in270 mm | 10 |
| December | 33°F 0°C | 18°F -8°C | 1.4 in 36 mm | 7.1 in180 mm | 4 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 14 | 1 |
| February | 7 | 0 |
| March | 10 | 4 |
| April | 4 | 2 |
| May | 12 | 1 |
| June | 10 | 4 |
| July | 7 | 7 |
| August | 13 | 6 |
| September | 15 | 3 |
| October | 12 | 1 |
| November | 10 | 0 |
| December | 4 | 1 |
Water Temperatures Data
↑ See chart| Month | Lake Avg High |
|---|---|
| January | 32°F 0°C |
| February | 32°F 0°C |
| March | 38°F 3°C |
| April | 49°F 9°C |
| May | 58°F 15°C |
| June | 70°F 21°C |
| July | 77°F 25°C |
| August | 74°F 23°C |
| September | 67°F 19°C |
| October | 59°F 15°C |
| November | 42°F 6°C |
| December | 32°F 0°C |