Dr. Elmer Bly House · Photo: John Branson, Historian for Lake Clark NPP · Public domainPort Alsworth gets about 88 inches of snow a winter, more than 96% of U.S. towns
Sunny July days climb to about 69°. Only 60° separates winter nights from summer afternoons. In July, afternoons here are cooler than in almost every U.S. town. For walks and days out, the stretch from June to August brings highs of 66–69°.
A year in Port Alsworth at a glance
Each month’s typical high and low, and what it brings.
What stands out about Port Alsworth’s climate
Compared with towns across the U.S., with Port Alsworth’s place in Alaska beside it.
What a year in Port Alsworth feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 134 frost-free days a year
In half of years the last 32° night comes by May 12 and the first by September 24. Frost and day counts come from NOAA’s station at Port Alsworth, AK, 3 miles from the town’s center, 430 ft lower.
The 2023 USDA map puts Port Alsworth’s center in zone 4a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −29°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 88 inches of snow a winter
Snow, measured at Port Alsworth, AK, is heaviest from November through December, about 18 inches a month. Precipitation (rain plus melted snow) adds up to 13 inches a year; September is the wettest month and May the driest. Rain or snow falls on about 95 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Port Alsworth
Nearly all of the work is heating: a normal year has almost no cooling days. Months averaging under 55° run from September through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Port Alsworth, AK.
Living with Port Alsworth’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
134 frost-free days in zone 4a. The last frost comes by May 12 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 24.
Months with highs of 62–84° and lows of 40° or more: June, July and August. 9.8 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Port Alsworth from natural hazards, earthquakes are the largest share (46%); heat waves, cold waves, winter storms and ice storms together are 16%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Port Alsworth and similar climates
TownRatings has no climate map of the towns around Port Alsworth yet.
Climates most like Port Alsworth’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Port Alsworth, AK | 10° | 69° | 13" | 88" |
| Woodland Park, CO | 11° | 77° | 22" | 134" |
| Superior, WI | 6° | 76° | 30" | 56" |
| Marquette, MI | 11° | 76° | 32" | 102" |
| Jackson, WY | 6° | 80° | 19" | 78" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
How Port Alsworth compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Port Alsworth’s place among Alaska’s.
Port Alsworth weather by month
Highs, lows and precipitation from the nearest NOAA station; snow, wet days and snow on the ground from Port Alsworth, AK. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground |
|---|---|---|---|---|---|---|
| January | 24° | 10° | 0.7" | 13.9" | 8 | 22 |
| February | 30° | 15° | 0.9" | 13.1" | 7 | 18 |
| March | 35° | 15° | 0.6" | 12.1" | 6 | 23 |
| April | 47° | 30° | 0.5" | 7.2" | 5 | 7 |
| May | 59° | 39° | 0.4" | 0.8" | 4 | 0 |
| June | 67° | 47° | 0.7" | 0.0" | 6 | 0 |
| July | 69° | 52° | 1.4" | 0.0" | 9 | 0 |
| August | 66° | 49° | 1.7" | 0.0" | 11 | 0 |
| September | 57° | 42° | 2.6" | 0.3" | 11 | 0 |
| October | 44° | 32° | 1.3" | 4.9" | 9 | 5 |
| November | 32° | 21° | 1.3" | 17.3" | 10 | 16 |
| December | 27° | 15° | 1.0" | 18.3" | 10 | 23 |
| Year | 46° | 30° | 13.1" | 87.9" | 95 | 112 |
Where Port Alsworth’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s 1991–2020 normals at the nearest station (NOAA’s grid doesn’t cover Alaska).
- Snow: Port Alsworth, AK.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Port Alsworth, AK, 3 miles from the town’s center, 430 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Port Alsworth’s climate
What is the weather like in Port Alsworth?
A typical July afternoon reaches 69°, a January night drops to 10°, and about 88 inches of snow falls in a normal winter. Colder January nights than 94% of U.S. towns; cooler July afternoons than all but 72 U.S. towns.
How cold does it get in Port Alsworth in winter?
January nights average 10°. About 172 nights a year reach 32° or below and 37 reach 0° or below.
How much snow does Port Alsworth get?
About 88 inches in a normal winter at Port Alsworth, AK, heaviest from November through December, about 18 inches a month, with snow on the ground about 112 days a year.
How hot does it get in Port Alsworth?
July, with a typical high of 69°. 90° days are rare: none in a normal year at Port Alsworth, AK.
When is the first and last frost in Port Alsworth?
In half of years the last spring frost (32°) comes by May 12 and the first fall frost by September 24, about 134 frost-free days, at Port Alsworth, AK.
What growing zone is Port Alsworth in?
Zone 4a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −29°.
What is the best time of year to visit Port Alsworth?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July and August. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Neighbors talk weather
Gardens, snow, and the best days of the year in Port Alsworth.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.