Weather & Climate
Lanark, Illinois, United States
Overview
Available climate summaries for Lanark. Origins and reference periods are unverified; stored values may include AI estimates. Treat these as estimates until independently verified.
Key Metrics
Annual Avg
9.4°C
Summer Avg
22.3°C
Winter Avg
-4.8°C
Record High
41°C
Record Low
-37.3°C
Annual Precipitation
951.5 mm
Avg Humidity
78%
Summer Humidity
75%
Winter Humidity
86%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 14.7° | -6.3° | -37.3° | 36.3 | 86% | 56 | 57.4 |
| Feb | 19.8° | -4.6° | -28.2° | 42.8 | 84% | 77 | 69.3 |
| Mar | 25.9° | 2.5° | -24.7° | 60.8 | 78% | 116 | 63.3 |
| Apr | 28.6° | 9.3° | -9.2° | 92.1 | 75% | 141 | 61.9 |
| May | 33.5° | 15.6° | -2.9° | 111.6 | 76% | 172 | 57.7 |
| Jun | 37.1° | 21.2° | 5.1° | 126.6 | 77% | 185 | 50.9 |
| Jul | 41° | 23.4° | 8.1° | 104.5 | 75% | 194 | 43.6 |
| Aug | 38.1° | 22.4° | 7.5° | 102.3 | 73% | 169 | 35.7 |
| Sep | 37.9° | 18.2° | 1° | 90.3 | 74% | 131 | 47.7 |
| Oct | 30.9° | 10.4° | -6.7° | 77.2 | 75% | 89 | 54.3 |
| Nov | 23.1° | 3.4° | -15.8° | 54.6 | 80% | 57 | 56.5 |
| Dec | 20.3° | -3.4° | -29° | 52.4 | 87% | 44 | 65.6 |
Data sources
Estimates and unverified origins
Oyster List climate data - Climate origins are unverified. Available methods include historical APIs and AI estimates; stored rows do not identify the original dataset, reference period, or model for each value. Treat these summaries as estimates until independently verified. Record updated 2026-03-22.