St Paul Island, AK Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from St Paul Island's primary NOAA station, ST PAUL ISLAND AP.
The climate verdict for St Paul Island
A compact 24.4°F seasonal swing gives St Paul Island, Alaska a steadier-than-extreme annual shape. NOAA reports an annual average of 36°F. At 44/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 10% of scores.
- 36°F
- average temperature, NOAA 1991-2020 normal
- 44/100
- comfort score, above 10% of station-mapped location scores
- 24.3"
- annual precipitation · 64" snow
- 116 days
- frost-free days per growing season
St Paul Island: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00025713 · St Paul Island, AK 36°F mean · 24.3" precip
TEMP-COLD · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-NARROW · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COLD 36°F
- RANK-COOL #137
- PHOTO-FINISH ≈ South Pass City
- PRCP-DRY 24.3"
- SWING-NARROW 24°F
- COMF-LOW 44/100
- LOAD-HEAT 10,585 HDD
- STN-1 USW00025713
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: South Pass City, WY ( -0.1 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every AK station list.
- St Paul Island (this station) 36°F
- Cold South Pass City, WY 36°F
- Hot Eagle Rvr Gakon…, AK 36°F
- Near Fort Richardson…, AK 36°F
- Near Yellowstone Nat…, WY 36°F
St Paul Island sits in Alaska, the #1 coldest U.S. state at 33.5°F statewide annual average - see all 50 coldest states ranked by NOAA normals
Climate Living Index · St Paul Island
St Paul Island: 26/100 · grade F
St Paul Island publishes all six Living Index dimensions from NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals.
PlainClimate-derived for St Paul Island, not an official NOAA rating. Rankings still use Comfort Score 44/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Summer moisture balance | 45.2°F mean dew point | 66/100 · C |
| Precipitation balance | 24.3 in · 10.7 from 35 in | 62/100 · C |
| Normal heat + freeze calendar | 190 calendar days | 19/100 · F |
| Snowfall burden | 64.3 inches/year | 13/100 · F |
| Frost-free season | 116 days/year | 5/100 · F |
| Annual temperature balance | 35.9°F · 31.6° from 67.5°F | 0/100 · F |
St Paul Island · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
St Paul Island falls in the polar Köppen band: ET
The warmest month stays below 10°C: tundra class (ET). Class ET is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: polar, specifically tundra.
- Köppen code
- ET
- Group
- Polar
- Warmest month
- 49.5°F
- Coldest month
- 25.1°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where St Paul Island sits across the climate record
Three NOAA fields for St Paul Island's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 98%
- Among 6,861 stations, St Paul Island sits in the cooler third of annual means.
- Annual precipitation
- 33rd percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 95%
- Warmest-to-coldest month gap for St Paul Island is compact versus 6,861 complete station-years.
How St Paul Island compares across U.S. station-mapped locations
St Paul Island's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
44 10th percentile score exceeds 10% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). This entry sits in this band.
- 50–60: 1,329 station-mapped locations (21%). Above this entry.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
St Paul Island's measured station temperature trend
MethodologyAcross 111 complete annual observations from 1840 to 2025, ST PAUL ISLAND AP warmed at a fitted rate of 0.19°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- St Paul Island primary station fitted change +0.19 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 29°F (-2°C) | 21°F (-6°C) | 25°F (-4°C) | 1.6" | 16.5" | 26.8 | 0.0 |
| February | 29°F (-1°C) | 21°F (-6°C) | 25°F (-4°C) | 1.4" | 11.1" | 24.6 | 0.0 |
| March | 30°F (-1°C) | 21°F (-6°C) | 25°F (-4°C) | 1.3" | 9.6" | 28.6 | 0.0 |
| April | 34°F (1°C) | 26°F (-3°C) | 30°F (-1°C) | 1.0" | 5.3" | 24.9 | 0.0 |
| May | 41°F (5°C) | 32°F (0°C) | 37°F (3°C) | 1.0" | 0.8" | 15.3 | 0.0 |
| June | 48°F (9°C) | 39°F (4°C) | 43°F (6°C) | 1.3" | 0.0" | 2.1 | 0.0 |
| July | 52°F (11°C) | 44°F (7°C) | 48°F (9°C) | 2.0" | 0.0" | 0.2 | 0.0 |
| August | 53°F (12°C) | 46°F (8°C) | 50°F (10°C) | 3.1" | 0.0" | 0.1 | 0.0 |
| September | 50°F (10°C) | 42°F (5°C) | 46°F (8°C) | 3.0" | 0.0" | 1.8 | 0.0 |
| October | 44°F (6°C) | 35°F (2°C) | 40°F (4°C) | 3.3" | 1.6" | 9.4 | 0.0 |
| November | 38°F (3°C) | 30°F (-1°C) | 34°F (1°C) | 3.0" | 7.1" | 18.2 | 0.0 |
| December | 33°F (1°C) | 25°F (-4°C) | 29°F (-2°C) | 2.3" | 12.3" | 24.4 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 53°F around August 11, short of 90°F on every date, while 190 dates carry a normal low at or below freezing, the coldest 20°F near March 10.
The freezing stretch
The normal low stays at or below 32°F into May 13, then returns to freezing around November 6, covering 190 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is November 12, when 77% of years recorded at least a hundredth of an inch. The driest is June 5 at 38%. Summed across the calendar, that is about 202 wet dates a year.
The widest day
June 4 carries the biggest normal gap between afternoon and dawn, 9°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for St Paul Island.
Where St Paul Island Stands Nationally
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 9°F.
Freezing is routine here by normals standards — the normal low reaches 32°F or colder on about 190 nights a year, more than most ranked stations.
St Paul Island earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 16.5"
17.2 days with precipitation
Snow: 11.1"
16.3 days with precipitation
Snow: 9.6"
14.0 days with precipitation
Snow: 5.3"
12.2 days with precipitation
Snow: 0.8"
12.3 days with precipitation
11.4 days with precipitation
14.1 days with precipitation
17.8 days with precipitation
19.5 days with precipitation
Snow: 1.6"
22.5 days with precipitation
Snow: 7.1"
23.0 days with precipitation
Snow: 12.3"
21.5 days with precipitation
St Paul Island spreads its precipitation across the year
Neither half of the year dominates here: June through August take 26% of the annual total and December through February 22%, with neither reaching the 35% that would mark a distinct wet season. St Paul Island has no dry season to plan around, though it does carry an unusually narrow 24.4°F seasonal spread.
The gap between the wettest and driest month still matters: October averages 3.3" and May 1.0". The three wettest months together take 39% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
Rain reaches St Paul Island in small, frequent amounts
St Paul Island records about 202 days with measurable precipitation a year and 24.3" in total, which works out to roughly 0.12 inches on an average wet day. Precipitation on 55% of all days, arriving that lightly, is the damp many-grey-days pattern rather than the storm-driven one.
Places in this band read as wetter than their annual totals suggest, because what people notice is the number of overcast days, not the depth in the gauge.
- Most wet days: November, about 23 of them.
- Fewest: June, about 11.
- Average depth per wet day: 0.12 inches.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Winter brings real snow to St Paul Island
St Paul Island averages 64.3 inches of snowfall a year, with January the snowiest month on the normals, spread across roughly 83 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 64.3 inches of depth.
- Days recording measurable snow: about 83 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 26% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
September 28
50% probability date
Last Spring Freeze
June 4
50% probability date
Growing Season
116 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
10,585
Higher = more heating needed
Cooling Degree Days
0
Higher = more cooling needed
Warmest Month
August
Coldest Month
March
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 84% | 19.4 | N/A | N/A |
| February | 85% | 17.7 | 9% | 58% |
| March | 84% | 16.8 | N/A | N/A |
| April | 86% | 14.4 | N/A | N/A |
| May | 89% | 13.2 | N/A | N/A |
| June | 92% | 11.8 | N/A | N/A |
| July | 93% | 11.1 | N/A | N/A |
| August | 91% | 13.3 | N/A | N/A |
| September | 84% | 15.6 | N/A | N/A |
| October | 82% | 16.9 | N/A | N/A |
| November | 81% | 18.1 | N/A | N/A |
| December | 82% | 18.0 | N/A | N/A |
Nationwide similar cities
Other rankable U.S. places outside AK closest to St Paul Island on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (36°F here).
- Fraser, CO 36°F · 0.1°F off
- Rolette, ND 36°F · 0.2°F off
- Orr, MN 36°F · 0.3°F off
- Dillon, CO 36°F · 0.4°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (24.3" here), excluding temperature-peer places.
- Red Lake Falls, MN 24.3" · 0.0" off
- Goodridge, MN 24.3" · 0.0" off
- Menard, TX 24.3" · 0.0" off
- Brackettville, TX 24.3" · 0.0" off
Snow and freeze rhythm
When cold and snow define St Paul Island
heating led · moderate · low swing
Heating is the larger measured load in St Paul Island, at 10,585 degree days versus 0 for cooling. Unlike a strongly continental record, however, its 24.4°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
Only about 116 days are frost-free in a normal year. That short interval is consistent with the cold-season signal, but the measure does not predict the exact first or last freeze in any one year.
-
1. St Paul Island coldest normal
March
Averaging 25°F (-4°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. St Paul Island typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. St Paul Island snow peak
January
St Paul Island averages 64.3 inches of snow a year, with January the snowiest month on the normals.
Questions about St Paul Island's climate
How much snow does St Paul Island get? ▼
How cold does St Paul Island get in winter? ▼
How much energy does heating and cooling require in St Paul Island? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from St Paul Island's primary station: ST PAUL ISLAND AP (USW00025713). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for St Paul Island; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for St Paul Island comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.