Climate Comfort Score
54/100
Moderate
NOAA 1991–2020 normals 35°F annual avg 2 stations
Port Alsworth, AK Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991–2020 normals →
- 35°F
- Avg annual temp
- 54/100
- Comfort score
- 23.6"
- Annual precip
- 102d
- Growing season
30-year climate normals from 2 weather stations (1991-2020).
The climate verdict for Port Alsworth
Port Alsworth, Alaska averages 35°F a year and scores 54/100 on the comfort index - moderate, milder than 27% of U.S. cities.
- 35°F
- annual average temperature (NOAA normal)
- 54/100
- comfort score, milder than 27% of U.S. cities
- 23.6"
- yearly precipitation total
- 102 days
- frost-free days per growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
35°F (2°C)
Avg High
45°F
Avg Low
25°F
Annual Precip
23.6"
Comfort Score
54/100
Moderate
Avg Annual Temperature
35°F
30-year mean (NOAA NCEI)
Annual Precipitation
23.6"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Port Alsworth) 54.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Port Alsworth area.
How Port Alsworth compares to every U.S. city
Port Alsworth's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
54 Top 73% higher than 27% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Port Alsworth
MethodologyZooming out from Port Alsworth's own normal, the chart below shows how the U.S. land temperature anomaly has tracked the global mean since 1900 - the most recent decade sits warmer than the 30-year mean shown here.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 24°F (-5°C) | 5°F (-15°C) | 14°F (-10°C) | 1.6" | N/A | 27.1 | 0.0 |
| February | 29°F (-2°C) | 10°F (-12°C) | 20°F (-7°C) | 1.5" | N/A | 24.9 | 0.0 |
| March | 32°F (0°C) | 11°F (-12°C) | 21°F (-6°C) | 1.2" | N/A | 29.3 | 0.0 |
| April | 46°F (8°C) | 24°F (-4°C) | 35°F (2°C) | 0.9" | N/A | 24.8 | 0.0 |
| May | 58°F (14°C) | 32°F (0°C) | 45°F (7°C) | 0.8" | N/A | 16.2 | 0.0 |
| June | 65°F (19°C) | 41°F (5°C) | 53°F (12°C) | 1.2" | N/A | 2.8 | 0.0 |
| July | 67°F (19°C) | 46°F (8°C) | 57°F (14°C) | 2.1" | N/A | 0.0 | 0.4 |
| August | 63°F (17°C) | 45°F (7°C) | 54°F (12°C) | 3.3" | N/A | 0.5 | 0.0 |
| September | 55°F (13°C) | 38°F (3°C) | 46°F (8°C) | 3.5" | N/A | 8.0 | 0.0 |
| October | 42°F (5°C) | 25°F (-4°C) | 33°F (1°C) | 2.3" | N/A | 20.5 | 0.0 |
| November | 30°F (-1°C) | 15°F (-9°C) | 22°F (-5°C) | 3.0" | N/A | 27.1 | 0.0 |
| December | 25°F (-4°C) | 9°F (-13°C) | 17°F (-8°C) | 2.2" | N/A | 27.6 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 1.6"
February 1.5"
March 1.2"
April 0.9"
May 0.8"
June 1.2"
July 2.1"
August 3.3"
September 3.5"
October 2.3"
November 3.0"
December 2.2"
Frost Dates & Growing Season
First Fall Freeze
September 12
50% probability date
Last Spring Freeze
June 2
50% probability date
Growing Season
102 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
10,991
Higher = more heating needed
Cooling Degree Days
4
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Port Alsworth's climate means for you
Port Alsworth runs 35°F a year - peaking in July, coldest in January.
- Gardeners get about 102 frost-free days, with the last spring freeze near June 2 - plan the planting calendar around it, not the regional average.
- Energy bills track 10,991 heating and 4 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Port Alsworth, AK
The NOAA 1991–2020 climate normals describe Port Alsworth, Alaska as a location with an annual average temperature of 35°F, ranging from a mean daily high of 45°F to a mean daily low of 25°F. July is typically the warmest month of the year, while January is the coldest. These thirty-year averages, computed from 2 weather stations, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Rainfall (and snow, where it falls) shapes day-to-day life here as much as temperature does. Port Alsworth sees about 23.6 inches of precipitation a year, with seasonal snowfall possible. The frost-free season averages 102 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near June 2 and the first fall freeze near September 12. On the energy side, 10,991 heating degree days and 4 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Port Alsworth scores 54/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above turn that into a planning tool: expect the mildest highs and lows in the shoulder seasons, July-driven heat at the peak of summer, and January-driven cold at the depth of winter. Every number here is a thirty-year average, not a forecast, so any given year can and does run warmer, cooler, wetter, or drier than the normal.
Frequently Asked Questions
What is the average temperature in Port Alsworth, AK? ▼
The average annual temperature in Port Alsworth, Alaska is 35°F. The warmest month averages 67°F (19°C) and the coldest averages 5°F (-15°C).
How much rain does Port Alsworth get? ▼
Port Alsworth receives 23.6 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Port Alsworth? ▼
Port Alsworth has a climate comfort score of 54/100 (Moderate), milder than 27% of U.S. cities in the PlainClimate database.
When is the growing season in Port Alsworth? ▼
Port Alsworth has approximately 102 frost-free days per year, with the last spring freeze around June 2 and the first fall freeze around September 12.
How much energy does heating and cooling require in Port Alsworth? ▼
Port Alsworth has 10,991 heating degree days and 4 cooling degree days annually, a heating-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Port Alsworth climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from 2 weather stations near Port Alsworth.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USW00026562. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.