May weather forecastPetersburg, AK
May
Weather in May
Perceived as the gateway to summer, May brings a perceptible change in Petersburg’s weather. Noticeable warming of temperatures further reduces the frequency of snowfall seen in the previous months. The number of daylight and sunshine hours significantly rise, highlighting the blooming of a delightful season. The sea temperature peaks at 45.4°F (7.4°C) during May, inviting maritime activities. From May onwards, Petersburg’s weather prominently shifts from the chilling cold to more inviting conditions.Temperature
The coming of May brings a minor shift in Petersburg's weather, with average high-temperatures adjusting from April's chilly 43.3°F (6.3°C) to a fresh 51.6°F (10.9°C). The average low-temperature of 41.9°F (5.5°C) is witnessed during May.Humidity
With an average relative humidity of 81%, May is the least humid month.Rainfall
The month with the least rainfall is May, when the rain falls for 17.1 days and typically collects 2.01" (51mm) of precipitation.Snowfall
Months with snowfall in Petersburg are January through May, October through December. May is the last month it regularly snows. During 0.2 snowfall days, in May, Petersburg aggregates 0.12" (3mm) of snow. Throughout the year, there are 47.5 snowfall days, and 58.23" (1479mm) of snow is accumulated.Ocean temperature
In May, the average ocean temperature is 45.3°F (7.4°C).Note: Swimming in 45.3°F (7.4°C) at temperatures under 50°F (10°C) requires thermal swimsuits; otherwise, one can face cold shock and breathing difficulty. Even brief immersion at 55.4°F (13°C) feels frosty.
Daylight
In Petersburg, the average length of the day in May is 16h and 31min.On the first day of May, sunrise is at 5:01 am and sunset at 8:35 pm. On the last day of the month, sunrise is at 4:07 am and sunset at 9:31 pm AKDT.
Sunshine
The month with the most sunshine is May, with an average of 7.4h of sunshine.UV index
In May, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 3 in May translates into this advice:
Exercise prevention - Warding off sunburn is urged. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Petersburg, AK
- Average high temperature in May: 51.6°F
The warmest month (with the highest average high temperature) is July (59.7°F).
The month with the lowest average high temperature is December (32.4°F).
- Average low temperature in May: 41.9°F
The month with the highest average low temperature is July (50.2°F).
The coldest month (with the lowest average low temperature) is February (25.9°F).
Average pressure in May
Petersburg, AK
- Average pressure in May: 30"Hg
The month with the highest atmospheric pressure is July (30.05"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).
Average wind speed in May
Petersburg, AK
- Average wind speed in May: 4.6mph
The windiest month (with the highest average wind speed) is January (8.2mph).
The calmest month (with the lowest average wind speed) is July (3.9mph).
Average humidity in May
Petersburg, AK
- Average humidity in May: 81%
The months with the highest relative humidity are January and August (86%).
The month with the lowest relative humidity is May (81%).
Average rainfall in May
Petersburg, AK
- Average rainfall in May: 2.01"
The wettest month (with the highest rainfall) is October (6.3").
The driest month (with the least rainfall) is May (2.01").
Average rainfall days in May
Petersburg, AK
- Average rainfall days in May: 17.1 days
The month with the highest number of rainy days is October (20.1 days).
The month with the least rainy days is February (9.5 days).
Average snowfall in May
Petersburg, AK
- Average snowfall in May: 0.12"
The month with the highest snowfall is March (13.46").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Petersburg, AK
- Average snowfall days in May: 0.2 days
The month with the highest number of snowfall days is March (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in May
Petersburg, AK
- Average sea temperature in May: 45.4°F
The best month for swimming (with the highest average sea temperature) is August (54.2°F).
The coldest month (with the lowest average sea temperature) is March (41°F).
Average daylight in May /
Average sunshine in May
Petersburg, AK
- Average daylight in May: 16h and 30min
The month with the longest days is June (Average daylight: 17h and 42min).
The month with the shortest days is December (Average daylight: 6h and 54min).
- Average sunshine in May: 7h and 24min
The month with the most sunshine is May (Average sunshine: 7h and 24min).
The months with the least sunshine are January and November (Average sunshine: 3h and 24min).
Average sunshine days in May
Petersburg, AK
- Average sunshine days in May: 11.3 days
The month with the most sunshine days is December (12.5 days).
The month with the least sunshine days is November (8 days).
Average UV index in May
Petersburg, AK
- Average UV index in May: 3
The months with the highest UV index are July and August (UV index 4).
The months with the lowest UV index are November and December (UV index 1).
Average cloud cover in May
Petersburg, AK
- Average cloud cover in May: 54
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are February and May (Cloud cover 54).
Average visibility in May
Petersburg, AK
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
