April weather forecastSaint John Harbor, AK
April
Weather in April
April in Saint John Harbor, Alaska, is a chilly spring month, with an average temperature varying between 43.3°F (6.3°C) and 34.3°F (1.3°C).Temperature
Saint John Harbor's transition into April brings a slight rise in the average high-temperature, moving from an icy 36.9°F (2.7°C) in March to a frosty 43.3°F (6.3°C). Saint John Harbor, in April, registers an average low temperature of 34.3°F (1.3°C), showing a minute reduction from daily highs.Humidity
The average relative humidity in April is 83%.Rainfall
In Saint John Harbor, in April, it is raining for 18.1 days, with typically 3.54" (90mm) of accumulated precipitation. Throughout the year, there are 197.9 rainfall days, and 53.03" (1347mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Saint John Harbor, during April, snow falls for 3.8 days and regularly aggregates up to 2.6" (66mm) of snow. Throughout the year, there are 47.5 snowfall days, and 58.23" (1479mm) of snow is accumulated.Daylight
The average length of the day in April is 14h and 18min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:31 pm. On the last day of April, sunrise is at 5:05 am and sunset at 8:32 pm AKDT.
Sunshine
In Saint John Harbor, the average sunshine in April is 6.7h.UV index
In Saint John Harbor, the average daily maximum UV index in April is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The average daily UV index of 2 in April transforms into the following instructions:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Saint John Harbor, AK
- Average high temperature in April: 43.3°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 April: 34.3°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 April
Saint John Harbor, AK
- Average pressure in April: 29.93"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 April
Saint John Harbor, AK
- Average wind speed in April: 5.7mph
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 April
Saint John Harbor, AK
- Average humidity in April: 83%
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 April
Saint John Harbor, AK
- Average rainfall in April: 3.54"
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 April
Saint John Harbor, AK
- Average rainfall days in April: 18.1 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 April
Saint John Harbor, AK
- Average snowfall in April: 2.6"
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 April
Saint John Harbor, AK
- Average snowfall days in April: 3.8 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 daylight in April /
Average sunshine in April
Saint John Harbor, AK
- Average daylight in April: 14h and 18min
The month with the longest days is June (Average daylight: 17h and 36min).
The month with the shortest days is December (Average daylight: 7h and 0min).
- Average sunshine in April: 6h and 42min
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 April
Saint John Harbor, AK
- Average sunshine days in April: 9.1 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 April
Saint John Harbor, AK
- Average UV index in April: 2
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 April
Saint John Harbor, AK
- Average cloud cover in April: 58
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 April
Saint John Harbor, AK
- Average visibility in April: 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).
