Petersburg Borough Climate
Petersburg Borough, Alaska
Avg Annual Temp
43.0°F
Annual Precip
110.2"
Annual Snowfall
85.6"
Extreme Heat Days
0
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Petersburg Borough Weather
A mild but incredibly wet maritime climate
Petersburg’s average temperature of 43.0°F is closer to the national median than northern Alaska, but still cooler. The region is defined by its extreme moisture, receiving 110.2 inches of precipitation annually. It is a temperate rainforest environment with zero days of extreme heat.
Among the warmest and wettest in Alaska
The borough is much warmer than the state average of 35.9°F, thanks to the moderating Pacific Ocean. It ranks as one of the wettest regions in the state, with precipitation more than double the Alaska average. This creates a lush, green landscape far removed from the arctic tundra.
Typical of the Southeast Alaska panhandle
Petersburg is slightly cooler than Prince of Wales-Hyder (45.0°F) but shares a similar rainy profile. While it gets 110.2 inches of rain, Sitka nearby receives even more at 152.8 inches. It experiences heavy snowfall of 85.6 inches, which is significantly more than its southern neighbors.
Damp, mild winters and cool summers
Winters are relatively mild for Alaska, averaging 31.6°F, but they bring a heavy 85.6 inches of snow. Summers are cool and cloudy, with a July average of only 56.3°F. This creates a narrow temperature range where extreme heat and extreme cold are both rare.
Prioritize high-end rain and snow gear
Waterproof clothing is the most important investment for 110.2 inches of annual precipitation. Heating systems should focus on moisture control and efficiency for the long, damp winter season. Residents must be prepared for heavy snow removal as nearly 86 inches falls annually.
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.