Climate and monthly weather forecastAnchorage, AK
Climate and monthly weather forecast
The climate of Anchorage
Anchorage, located in Alaska, USA, falls under a subarctic climate zone, specifically identified by the Köppen climate classification as Dfc. This characterizes a climate marked by severe winters, cool summers, and an absence of a dry season. Geographically, Anchorage finds itself in a setting where maritime and continental climates merge, leading to weather conditions that are extremely dynamic and variable.Throughout the year, Anchorage sees a wide range of temperatures, with averages fluctuating between 13.1°F (-10.5°C) and 61.9°F (16.6°C). It is noteworthy that temperatures in winter dip significantly, with the coldest month of December witnessing a chill low of 13.1°F (-10.5°C). In contrast, the July summer offers the highest warmth peaking at 61.9°F (16.6°C).
Humidity in Anchorage remains relatively high year-round, with a slight decrease observed during the drier spring and summer months, where it drops to as low as 68%. Precipitation levels also vary greatly throughout the year. Although rainfall is prevalent almost all year round, its intensity varies. The heaviest rainfall occurs in September with an average of 1.93" (49mm), while the drier times of the year, come in May with an average rainfall of just 0.55" (14mm).
Uniquely, Anchorage receives a significant amount of snowfall, with the heaviest snowfalls typically occurring in December and reaching as high as 5.51" (140mm). The longest days experienced are in June with approximately 19.2 hours of daylight. It is during these months that the city basks in the maximum sunshine of 11.7 hours.
The best time to visit Anchorage
The best time to plan a visit to Anchorage would be during the summer months, particularly from June to August. During this time, temperatures range from a comfortable 58.1°F (14.5°C) to 61.9°F (16.6°C) and rainfall is relatively low compared to other months. These mild temperatures coupled with long sunshine hours (averaging 11.7 hours in June) make for ideal conditions for outdoor exploration and wildlife viewing, which are popular activities in the region.The worst time to visit Anchorage
The least favorable months to visit Anchorage would be November through March when the city is in the grip of its harsh winter. During these times, temperatures drop drastically, averaging between 13.1°F (-10.5°C) and 29.7°F (-1.3°C), making outdoor activities uncomfortable. It is also the period when the city experiences heavy snowfall, reaching up to 5.51" (140mm), and the daylight hours are considerably reduced, dropping to as low as 6.6 in December.Spring weather in Anchorage
Spring in Anchorage is characterized by a gradual warming trend from March to May. As the season progresses from a cool 28.9°F (-1.7°C) in March to a warmer 51.1°F (10.6°C) in May, the snow starts to melt and the city blossoms under daylight hours expanding to 17.6 hours. The increased sunshine and daylight hours offset the relatively high rainfall of 0.55" (14mm) to 0.67" (17mm) during these months.Summer weather in Anchorage
Summers in Anchorage are mild and enjoyable, with temperatures ranging from 51.1°F (10.6°C) in May to a peak of 61.9°F (16.6°C) in July. There is a spike in rainfall during these months, increasing to 1.22" (31mm) in July from 0.75" (19mm) in June. Nevertheless, the longer sunshine hours, which reach their maximum value of 11.7 hours in June and July, make summers in Anchorage perfect for outdoor activities.Autumn weather in Anchorage
As autumn sets in from September, temperatures in Anchorage start to drop from 52.7°F (11.5°C) to a cool 28°F (-2.2°C) by November. This period witnesses an increase in rainfall, reaching its highest at 1.93" (49mm) in September, followed by a decrease to 1.02" (26mm) in November. Despite the increase in precipitation, the beauty of fall foliage can be a captivating sight for visitors.Winter weather in Anchorage
Winter in Anchorage is marked by cold temperatures, heavy snowfall, and short daylight hours. From December to February, temperatures can drop to as low as 13.1°F (-10.5°C). December sees the highest snowfall, reaching 5.51" (140mm), providing perfect conditions for winter sports enthusiasts. However, with daylight hours dipping to as low as 5.6 hours in December and January, outdoor activities are limited.Weather in January
January in Anchorage, Alaska reveals a somewhat bleak landscape, painted in hues of white and gray. Cold temperatures prevail, with averages oscillating between 13.1°F (-10.5°C) and 20.3°F (-6.5°C), marking January as one of the coldest months of the year. Weather in January »Weather in February
The transition from January to February in Anchorage provides little relief from the winter's harshness. But the city endures, regardless of the chilly temperatures and the continuation of snowfall. There's a surprising shift visible as daylight hours gradually increase, lifting the city out from the gloomy winter dusk. Weather in February »Weather in March
March is a crucial transitionary period in Anchorage. The city begins to shrug off winter's icy grasp, as temperatures start to climb higher than in February. Milder weather conditions foster a positive atmosphere across the city, although the presence of snow remains. Weather in March »Weather in April
April witnesses more consistent progress towards milder weather conditions in Anchorage. Winter is receding into the rearview mirror as frosty winds lessen and temperatures rise from March levels. The increased amount of sunlight works its thawing magic, diminishing snowfall to an all-time low and coaxing spring blooms from their slumber. Weather in April »Weather in May
May in Anchorage is characterized by mild weather and blooming flora, bringing a rejuvenating vibe to the city. The icy grip of winter has released completely now, hence temperatures continue their ascent, providing a favorable climate. Weather in May »Weather in June
June ushers in a glorious summer for Anchorage, banishing any remnants of the long, gloomy winter. The city rejoices under clear sunny skies and appreciable temperatures. Maximum daylight hours dominate June days, affording locals and tourists alike ample opportunity to enjoy outdoor activities. Weather in June »Weather in July
July in Anchorage can be classified as a peak summer month, boasting the highest average temperature of 61.9°F (16.6°C). Residents make the most of the extended daylight hours and generous sunshine as they dive into various outdoor pursuits. Weather in July »Weather in August
August manifests a change in Anchorage's weather, signaling the gradual retreat of the intense summer heat. The city witnesses a dip in temperature compared to July but still hovers within the comfortable range. As August progresses, the hours of daylight start to reduce, indicating the approach of autumn. Weather in August »Weather in September
September marks the beginning of fall in Anchorage, as temperatures drop from August highs and daylight hours drastically shorten. Despite the melancholy of shrinking days, the city is ablaze with the vibrant colors of autumn foliage. Weather in September »Weather in October
In October, Anchorage starts preparing for the impending winter. A noticeable drop in temperature is observed, offering a stark contrast to the September warmth. While the hours of daylight dwindle further, they bring a spectral hue to the sky that is unique to Alaskan autumns. Weather in October »Weather in November
As November unfolds, Anchorage braces for winter, with temperatures hovering between 22.1°F (-5.5°C) and 28°F (-2.2°C). The diminishing daylight hours make way for longer nights, a typical trait of Alaskan winters. The change in climate encourages increased snowfall compared to October, painting Anchorage in a dazzling white. Weather in November »Weather in December
December marks the arrival of peak winter in Anchorage, with the city enveloped in a cool, serene ambiance. While temperatures decline further from November, heavy snowfall transforms the city into a winter wonderland. The precipitous reduction in daylight hours encapsulates Anchorage in an enchanting twilight, causing the city to glisten under ambient lighting. Weather in December »Updated: Jul 2, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In Anchorage, the average lowest temperatures are observed in January, with a high of 20.3°F (-6.5°C) and a low of 13.1°F (-10.5°C).
The months with the highest humidity are January through March, with an average relative humidity of 86%.
Throughout the year, in Anchorage, there are 139.9 rainfall days, and 12.6" (320mm) of precipitation is accumulated.
Months with snowfall are January through May, September through December.
In Anchorage, during the entire year, snow falls for 59.3 days and aggregates up to 23.5" (597mm) of snow.
February is the month with the coldest seawater, with an average ocean temperature of 35.8°F (2.1°C).
February is the month with the lowest UV index, with an average maximum UV index of 1.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from AKST to AKDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from AKDT to AKST.
With an average relative humidity of 68%, May is the least humid month.
The month with the least rainfall is May, when the rain falls for 11.5 days and typically collects 0.55" (14mm) of precipitation.
May and June, with an average of 11.7h of sunshine, are months with the most sunshine.
June through August are months without snowfall.
The month with the longest days is June, with an average of 19h and 12min of daylight.
June and July, with an average maximum UV index of 4, are months with the highest UV index.
July, recognised by an average high temperature of 61.9°F (16.6°C) and a low of 51.3°F (10.7°C), is Anchorage's warmest month.
August is the month with the warmest seawater in Anchorage, with an average ocean temperature of 53.1°F (11.7°C).
The month with the most rainfall is September, when the rain falls for 16 days and typically aggregates up to 1.93" (49mm) of precipitation.
December is the month with the most snowfall. Snow falls for 11.6 days and accumulates 5.51" (140mm) of snow.
December has the shortest days of the year, with an average of 5h and 36min of daylight.
The month with the least sunshine in Anchorage is December, with an average of 3.8h of sunshine.
Average temperature
Anchorage, AK
The warmest month (with the highest average high temperature) is July (61.9°F).
The month with the lowest average high temperature is January (20.3°F).
The month with the highest average low temperature is July (51.3°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).
Average pressure
Anchorage, AK
- Average pressure in January:
29.7"Hg - Average pressure in February:
29.82"Hg - Average pressure in March:
29.76"Hg - Average pressure in April:
29.82"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.86"Hg - Average pressure in September:
29.74"Hg - Average pressure in October:
29.7"Hg - Average pressure in November:
29.67"Hg - Average pressure in December:
29.67"Hg
The month with the highest atmospheric pressure is July (29.96"Hg).
The months with the lowest atmospheric pressure are November and December (29.67"Hg).
Average wind speed
Anchorage, AK
- Average wind speed in January:
5.5mph - Average wind speed in February:
5.2mph - Average wind speed in March:
5.1mph - Average wind speed in April:
5.2mph - Average wind speed in May:
5.2mph - Average wind speed in June:
4.8mph
- Average wind speed in July:
4.5mph - Average wind speed in August:
4.7mph - Average wind speed in September:
5.2mph - Average wind speed in October:
5.5mph - Average wind speed in November:
6.3mph - Average wind speed in December:
6.2mph
The windiest month (with the highest average wind speed) is November (6.3mph).
The calmest month (with the lowest average wind speed) is July (4.5mph).
Average humidity
Anchorage, AK
The months with the highest relative humidity are January, February and March (86%).
The month with the lowest relative humidity is May (68%).
Average rainfall
Anchorage, AK
- Average rainfall in January:
0.63" - Average rainfall in February:
0.71" - Average rainfall in March:
0.71" - Average rainfall in April:
0.67" - Average rainfall in May:
0.55" - Average rainfall in June:
0.75"
- Average rainfall in July:
1.22" - Average rainfall in August:
1.57" - Average rainfall in September:
1.93" - Average rainfall in October:
1.65" - Average rainfall in November:
1.02" - Average rainfall in December:
1.18"
The wettest month (with the highest rainfall) is September (1.93").
The driest month (with the least rainfall) is May (0.55").
Average rainfall days
Anchorage, AK
- Average rainfall days in January:
7.8 days - Average rainfall days in February:
7 days - Average rainfall days in March:
8.5 days - Average rainfall days in April:
10.8 days - Average rainfall days in May:
11.5 days - Average rainfall days in June:
12.5 days
- Average rainfall days in July:
14.6 days - Average rainfall days in August:
17.9 days - Average rainfall days in September:
16 days - Average rainfall days in October:
15.2 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
8.6 days
The month with the highest number of rainy days is August (17.9 days).
The month with the least rainy days is February (7 days).
Average snowfall
Anchorage, AK
- Average snowfall in January:
3.15" - Average snowfall in February:
4.45" - Average snowfall in March:
4.13" - Average snowfall in April:
2.09" - Average snowfall in May:
0.12" - Average snowfall in June:
0"
The month with the highest snowfall is December (5.51").
The months with the least snowfall are June, July and August (0").
Average snowfall days
Anchorage, AK
- Average snowfall days in January:
9.3 days - Average snowfall days in February:
11.4 days - Average snowfall days in March:
10.1 days - Average snowfall days in April:
5.4 days - Average snowfall days in May:
0.3 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.3 days - Average snowfall days in October:
2.4 days - Average snowfall days in November:
8.5 days - Average snowfall days in December:
11.6 days
The month with the highest number of snowfall days is December (11.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average sea temperature
Anchorage, AK
The best month for swimming (with the highest average sea temperature) is August (53.1°F).
The coldest month (with the lowest average sea temperature) is February (35.8°F).
Average daylight / Average sunshine
Anchorage, AK
- Average daylight in January:
6h and 36min - Average daylight in February:
9h and 6min - Average daylight in March:
11h and 54min - Average daylight in April:
14h and 48min - Average daylight in May:
17h and 36min - Average daylight in June:
19h and 12min
- Average daylight in July:
18h and 18min - Average daylight in August:
15h and 42min - Average daylight in September:
12h and 54min - Average daylight in October:
10h and 0min - Average daylight in November:
7h and 18min - Average daylight in December:
5h and 36min
The month with the longest days is June (Average daylight: 19h and 12min).
The month with the shortest days is December (Average daylight: 5h and 36min).
- Average sunshine in January:
4h and 0min - Average sunshine in February:
5h and 24min - Average sunshine in March:
7h and 6min - Average sunshine in April:
8h and 36min - Average sunshine in May:
11h and 42min - Average sunshine in June:
11h and 42min
- Average sunshine in July:
11h and 6min - Average sunshine in August:
9h and 54min - Average sunshine in September:
7h and 36min - Average sunshine in October:
6h and 12min - Average sunshine in November:
4h and 36min - Average sunshine in December:
3h and 48min
The months with the most sunshine are May and June (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 3h and 48min).
Average sunshine days
Anchorage, AK
- Average sunshine days in January:
16.9 days - Average sunshine days in February:
12.8 days - Average sunshine days in March:
16 days - Average sunshine days in April:
12.9 days - Average sunshine days in May:
16.3 days - Average sunshine days in June:
14.1 days
- Average sunshine days in July:
14.2 days - Average sunshine days in August:
11.4 days - Average sunshine days in September:
11.1 days - Average sunshine days in October:
13.4 days - Average sunshine days in November:
15 days - Average sunshine days in December:
15.5 days
The month with the most sunshine days is January (16.9 days).
The month with the least sunshine days is September (11.1 days).
Average UV index
Anchorage, AK
The months with the highest UV index are June and July (UV index 4).
The month with the lowest UV index is February (UV index 1).
Average cloud cover
Anchorage, AK
The month with the most cloud cover is December (Cloud cover 47).
The month with the least cloud cover is May (Cloud cover 38).
Average visibility
Anchorage, AK
The months with the highest visibility are January, February, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is March (5mi).
