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Monthly climate in Petersburg, Alaska, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Petersburg features a humid continental climate (Dfb). Temperatures typically range between -2 °C (29 °F) and 15 °C (59 °F) through the year, but rarely can drop to -26 °C (-14 °F) or can rise to as high as 30 °C (86 °F). The average annual precipitation amounts to about 2757 mm (108.5 inches) and receives 224 rainy days on the 1 mm (0.04 inches) threshold annually. Petersburg enjoys an average of 1742 hours of sunshine throughout the year, and daylight varies from 6 hours 51 minutes to 17 hours 42 minutes per day.

Monthly average temperatures in Petersburg, Alaska, United States §

The warmest months in Petersburg are June, July and August, with daily mean temperatures ranging from 13 to 15 °C (55 - 59 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 0 °C (29 - 33 °F) throughout the day. On average each year, Petersburg experiences 2 days above 25 °C (77.0 °F) and 93 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Petersburg, Alaska, United States. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 11°C
(52°F)		 11°C
(53°F)		 16°C
(60°F)		 16°C
(61°F)		 22°C
(73°F)		 26°C
(79°F)		 27°C
(81°F)		 30°C
(86°F)		 25°C
(77°F)		 16°C
(61°F)		 12°C
(54°F)		 12°C
(53°F)
Mean maximum 8°C
(46°F)		 6°C
(44°F)		 10°C
(50°F)		 14°C
(58°F)		 20°C
(69°F)		 23°C
(74°F)		 25°C
(77°F)		 25°C
(77°F)		 21°C
(70°F)		 14°C
(57°F)		 10°C
(50°F)		 9°C
(49°F)
Average high 1°C
(35°F)		 1°C
(35°F)		 5°C
(41°F)		 9°C
(48°F)		 14°C
(57°F)		 16°C
(61°F)		 18°C
(64°F)		 17°C
(64°F)		 15°C
(59°F)		 9°C
(48°F)		 5°C
(41°F)		 2°C
(36°F)
Daily mean -1°C
(30°F)		 -2°C
(29°F)		 1°C
(35°F)		 5°C
(42°F)		 10°C
(50°F)		 13°C
(55°F)		 15°C
(59°F)		 15°C
(59°F)		 12°C
(54°F)		 6°C
(44°F)		 3°C
(38°F)		 0°C
(33°F)
Average low -3°C
(26°F)		 -5°C
(24°F)		 -2°C
(29°F)		 2°C
(36°F)		 7°C
(45°F)		 10°C
(51°F)		 13°C
(55°F)		 12°C
(54°F)		 9°C
(49°F)		 4°C
(40°F)		 1°C
(34°F)		 -2°C
(28°F)
Mean minimum -17°C
(1°F)		 -14°C
(7°F)		 -9°C
(15°F)		 -4°C
(26°F)		 3°C
(37°F)		 7°C
(44°F)		 10°C
(50°F)		 9°C
(49°F)		 5°C
(41°F)		 -1°C
(30°F)		 -5°C
(24°F)		 -12°C
(10°F)
Minimum -26°C
(-14°F)		 -20°C
(-3°F)		 -13°C
(9°F)		 -8°C
(18°F)		 2°C
(36°F)		 5°C
(42°F)		 9°C
(49°F)		 9°C
(48°F)		 3°C
(37°F)		 -4°C
(26°F)		 -7°C
(20°F)		 -25°C
(-13°F)

Compare climate in Petersburg with other places

Compare temperature, precipitation, sunshine, UV index in Petersburg, Alaska, United States with other places around the world.

Monthly average precipitation in Petersburg, Alaska, United States §

Petersburg usually has the most precipitation in August, September and November, with an average of 20 rainy days and 298 mm (11.7 inches) of precipitation per month. The driest months in Petersburg are February, March and May. On average, 171 mm (6.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Petersburg, Alaska, United States. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 225 (8.9) 176 (6.9) 177 (7.0) 190 (7.5) 160 (6.3) 206 (8.1) 195 (7.7) 297 (11.7) 288 (11.3) 276 (10.9) 309 (12.2) 258 (10.2)
Average precipitation days (≥ 1 mm) 17 14 17 18 18 23 18 20 18 20 22 19

Monthly sunshine hours in Petersburg, Alaska, United States §

The sunniest months in Petersburg are April, May and June, when the sun shines an average of 7 hours 1 minutes a day. Least sunny months in Petersburg: January, November and December receive an average of 1 hours 39 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Petersburg, Alaska, United States. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 43 119 168 207 220 211 206 183 169 101 58 50
Mean daily daylight hours 7h 32m 9h 32m 11h 55m 14h 20m 16h 31m 17h 42m 17h 2m 15h 1m 12h 40m 10h 16m 8h 3m 6h 51m

Solar UV radiation in Petersburg, Alaska, United States §

Petersburg experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 6 - 7, which corresponds to the High category of sun exposure. January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 1. For more detailed information, check out our hourly Petersburg UV Index data.

Average daily maximum UV levels by month for Petersburg, Alaska, United States. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 1 2 3 5 6 6 7 7 5 3 1 1

Detailed Monthly Weather Insights for Petersburg, Alaska, United States

Discover in-depth weather details for every month in Petersburg. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Petersburg's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.