St George 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 George Island's primary NOAA station, ST GEORGE ISLAND AP.
The climate verdict for St George Island
A compact 22.8°F seasonal swing gives St George Island, Alaska a steadier-than-extreme annual shape. NOAA reports an annual average of 37°F. At 52/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 24% of scores.
- 37°F
- average temperature, NOAA 1991-2020 normal
- 52/100
- comfort score, above 24% of station-mapped location scores
- 20.4"
- yearly precipitation total
- 127 days
- growing season, frost-free days
St George Island: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00025628 · St George Island, AK 37°F mean · 20.4" precip
TEMP-COLD · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-NARROW · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COLD 37°F
- RANK-COOL #137
- PHOTO-FINISH ≈ Intricate Bay
- PRCP-DRY 20.4"
- SWING-NARROW 23°F
- COMF-LOW 52/100
- LOAD-HEAT 10,305 HDD
- STN-1 USW00025628
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Intricate Bay, AK (+ 0 °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 George Island (this station) 37°F
- Hot Eagle Rvr, AK 37°F
- Near Intricate Bay, AK 37°F
- Near Fairplay S Park…, CO 37°F
- Near Matanuska, AK 37°F
St George 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 George Island
St George Island: 19/100 · grade F
St George Island publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for St George Island, not an official NOAA rating. Rankings still use Comfort Score 52/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 20.4 in · 14.6 from 35 in | 49/100 · D |
| Normal heat + freeze calendar | 184 calendar days | 23/100 · F |
| Frost-free season | 127 days/year | 10/100 · F |
| Annual temperature balance | 36.7°F · 30.8° from 67.5°F | 0/100 · F |
St George Island · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
St George 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
- 49.3°F
- Coldest month
- 26.5°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 George Island sits across the climate record
Three NOAA fields for St George 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 George Island sits in the cooler third of annual means.
- Annual precipitation
- Drier than 72%
- St George Island's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 95%
- Warmest-to-coldest month gap for St George Island is compact versus 6,861 complete station-years.
How St George Island compares across U.S. station-mapped locations
St George Island's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
52 24th percentile score exceeds 24% 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%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). This entry sits in this band.
- 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
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 30°F (-1°C) | 23°F (-5°C) | 27°F (-3°C) | 1.2" | 26.1 | 0.0 |
| February | 32°F (0°C) | 24°F (-4°C) | 28°F (-2°C) | 1.1" | 22.1 | 0.0 |
| March | 31°F (0°C) | 23°F (-5°C) | 27°F (-3°C) | 0.8" | 26.7 | 0.0 |
| April | 35°F (2°C) | 28°F (-2°C) | 32°F (0°C) | 0.9" | 22.7 | 0.0 |
| May | 42°F (5°C) | 34°F (1°C) | 38°F (3°C) | 1.0" | 12.0 | 0.0 |
| June | 47°F (8°C) | 39°F (4°C) | 43°F (6°C) | 1.3" | 1.3 | 0.0 |
| July | 51°F (11°C) | 44°F (7°C) | 48°F (9°C) | 2.0" | 0.1 | 0.0 |
| August | 52°F (11°C) | 46°F (8°C) | 49°F (10°C) | 2.7" | 0.0 | 0.0 |
| September | 50°F (10°C) | 42°F (6°C) | 46°F (8°C) | 2.5" | 1.2 | 0.0 |
| October | 43°F (6°C) | 36°F (2°C) | 40°F (4°C) | 3.0" | 8.2 | 0.0 |
| November | 38°F (3°C) | 30°F (-1°C) | 34°F (1°C) | 2.3" | 17.4 | 0.0 |
| December | 34°F (1°C) | 26°F (-3°C) | 30°F (-1°C) | 1.8" | 24.0 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 53°F around August 6, short of 90°F on every date, while 184 dates carry a normal low at or below freezing, the coldest 23°F near January 11.
The freezing stretch
The normal low stays at or below 32°F into May 6, then returns to freezing around November 5, covering 184 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 October 16, when 75% of years recorded at least a hundredth of an inch. The driest is March 25 at 35%. Summed across the calendar, that is about 188 wet dates a year.
The widest day
May 25 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 George Island.
Where St George 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 184 nights a year, more than most ranked stations.
St George 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
13.0 days with precipitation
14.3 days with precipitation
11.2 days with precipitation
11.2 days with precipitation
13.1 days with precipitation
11.5 days with precipitation
14.4 days with precipitation
17.5 days with precipitation
19.5 days with precipitation
23.0 days with precipitation
20.9 days with precipitation
18.6 days with precipitation
St George Island spreads its precipitation across the year
Neither half of the year dominates here: June through August take 29% of the annual total and December through February 20%, with neither reaching the 35% that would mark a distinct wet season. St George Island has no dry season to plan around, though it does carry an unusually narrow 22.8°F seasonal spread.
The gap between the wettest and driest month still matters: October averages 3.0" and March 0.8". The three wettest months together take 40% 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 George Island in small, frequent amounts
St George Island records about 188 days with measurable precipitation a year and 20.4" in total, which works out to roughly 0.11 inches on an average wet day. Precipitation on 52% 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: October, about 23 of them.
- Fewest: March, about 11.
- Average depth per wet day: 0.11 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.
Frost Dates & Growing Season
First Fall Freeze
October 5
50% probability date
Last Spring Freeze
May 31
50% probability date
Growing Season
127 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
10,305
Higher = more heating needed
Cooling Degree Days
0
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside AK closest to St George 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 (37°F here).
- Babbitt, MN 37°F · 0.0°F off
- Lutsen, MN 37°F · 0.0°F off
- Island Park, ID 37°F · 0.1°F off
- Jackson, MT 37°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (20.4" here), excluding temperature-peer places.
- Telluride, CO 20.4" · 0.0" off
- Colby, KS 20.4" · 0.0" off
- Sterling City, TX 20.4" · 0.0" off
- Zapata, TX 20.4" · 0.0" off
Data-derived climate profile
How St George Island's climate pattern fits together
heating led · moderate · low swing
Heating is the larger measured load in St George Island, at 10,305 degree days versus 0 for cooling. Unlike a strongly continental record, however, its 22.8°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
Only about 127 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.
Temperature varies within a narrow 22.8°F band across the normal year. August and January mark the typical warm and cold ends of the calendar. The annual average is 37°F. Monthly rows still matter, but they refine a steady profile rather than reveal two climatic extremes.
St George Island's 20.4 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from St George Island's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for St George Island, not an official NOAA class or a year-ahead forecast.
Questions about St George Island's climate
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Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from St George Island's primary station: ST GEORGE ISLAND AP (USW00025628). 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 George 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 George 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.