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Weather & Climate
Petersburg Borough, Alaska, United States
Overview
Climate data and monthly weather averages for Petersburg Borough.
Key Metrics
Annual Avg
3.4°C
Summer Avg
11°C
Winter Avg
-3°C
Record High
26.6°C
Record Low
-26.2°C
Annual Precipitation
3086.6 mm
Avg Humidity
89%
Summer Humidity
85%
Winter Humidity
93%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 7.5° | -2.8° | -26.2° | 338.2 | 93% | 14 | 47.6 |
| Feb | 5.2° | -3.3° | -22.8° | 205.8 | 92% | 34 | 49.9 |
| Mar | 9.8° | -1.9° | -23.5° | 212.7 | 90% | 71 | 48.9 |
| Apr | 12.4° | 1.8° | -12.8° | 174.3 | 87% | 108 | 47.9 |
| May | 20.1° | 5.7° | -7.4° | 149.1 | 85% | 143 | 39.6 |
| Jun | 26.6° | 9.4° | 0.9° | 143.4 | 83% | 141 | 33.3 |
| Jul | 25.3° | 11.8° | 4.7° | 197.5 | 86% | 128 | 26.7 |
| Aug | 25.6° | 11.8° | 4.9° | 264.4 | 86% | 110 | 29.5 |
| Sep | 21.9° | 8.5° | 0.5° | 363.3 | 89% | 71 | 39.4 |
| Oct | 15.6° | 3.8° | -13.5° | 372 | 91% | 40 | 42.6 |
| Nov | 8.3° | -0.8° | -23.6° | 334.5 | 93% | 17 | 54.7 |
| Dec | 5.5° | -2.8° | -20.4° | 331.4 | 94% | 10 | 50.5 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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