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Weather & Climate
Jefferson County, New York, United States
Overview
Climate data and monthly weather averages for Jefferson County.
Key Metrics
Annual Avg
8.3°C
Summer Avg
19.7°C
Winter Avg
-3.1°C
Record High
31.6°C
Record Low
-28°C
Annual Precipitation
940.8 mm
Avg Humidity
81%
Summer Humidity
79%
Winter Humidity
87%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 11.3° | -4.5° | -24° | 68.2 | 89% | 40 | 58.5 |
| Feb | 10.5° | -4.3° | -28° | 60.5 | 87% | 56 | 62 |
| Mar | 17.6° | -0.4° | -21.3° | 58.9 | 82% | 102 | 56.9 |
| Apr | 22.7° | 5.3° | -7.8° | 75 | 80% | 135 | 55.7 |
| May | 24.7° | 11.4° | -0.9° | 79 | 81% | 171 | 41.2 |
| Jun | 28.3° | 16.9° | 5.2° | 87 | 81% | 178 | 35 |
| Jul | 31.6° | 20.9° | 9.1° | 80.3 | 79% | 186 | 29.4 |
| Aug | 29.8° | 21.2° | 12.2° | 79 | 76% | 163 | 35.4 |
| Sep | 28.9° | 17.7° | 6° | 78.3 | 76% | 125 | 51.3 |
| Oct | 23.4° | 11.1° | -1° | 111.9 | 78% | 77 | 43.8 |
| Nov | 17.9° | 5° | -10.1° | 77.1 | 81% | 47 | 58.6 |
| Dec | 15° | -0.6° | -20° | 85.6 | 86% | 31 | 54.3 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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