Glennallen, AK Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Glennallen's primary NOAA station, GLENNALLEN 64 N.
The climate verdict for Glennallen
Winter sets the terms in Glennallen, Alaska. A pronounced 56.3°F seasonal swing and heating demand above twice the cooling total frame an annual average of 26°F. At 40/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 6% of scores.
- 26°F
- yearly average temperature, NOAA normal
- 40/100
- comfort score, above 6% of station-mapped location scores
- 18.7"
- precipitation, annual total
- 80 days
- frost-free days per growing season
Glennallen: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00056401 · Glennallen, AK 26°F mean · 18.7" precip
TEMP-COLD · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COLD 26°F
- RANK-COOL #1
- PHOTO-FINISH ≈ Manley Hot Spri…
- PRCP-DRY 18.7"
- SWING-WIDE 56°F
- COMF-LOW 40/100
- LOAD-HEAT 14,388 HDD
- STN-1 USW00056401
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Manley Hot Springs, AK ( -0.8 °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.
- Glennallen (this station) 26°F
- Hot Ruby, AK 26°F
- Near Lake Susitna, AK 26°F
- Cold Manley Hot Spri…, AK 25°F
- Near Northway, AK 25°F
Glennallen 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 · Glennallen
Glennallen: 8/100 · grade F
Glennallen publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Glennallen, not an official NOAA rating. Rankings still use Comfort Score 40/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 18.7 in · 16.3 from 35 in | 42/100 · D |
| Annual temperature balance | 25.5°F · 42.0° from 67.5°F | 0/100 · F |
| Frost-free season | 80 days/year | 0/100 · F |
| Normal heat + freeze calendar | 253 calendar days | 0/100 · F |
Glennallen · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Glennallen is a continental Köppen climate: Dfc
Coldest-month mean -1.8°F and warmest-month mean 54.5°F place this station in continental, no dry season, cool summer climates (Dfc). Class Dfc is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, cool summer.
- Köppen code
- Dfc
- Group
- Continental
- Warmest month
- 54.5°F
- Coldest month
- -1.8°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 Glennallen sits across the climate record
Three NOAA fields for Glennallen's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 100%
- Among 6,861 stations, Glennallen sits in the cooler third of annual means.
- Annual precipitation
- Drier than 74%
- Glennallen's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Wider than 94%
- Warmest-to-coldest month gap for Glennallen is large versus 6,861 complete station-years.
How Glennallen compares across U.S. station-mapped locations
Glennallen's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
40 6th percentile score exceeds 6% 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
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 7°F (-14°C) | -10°F (-23°C) | -2°F (-19°C) | 0.9" | 31.0 | 0.0 |
| February | 15°F (-9°C) | -7°F (-22°C) | 4°F (-15°C) | 0.5" | 28.0 | 0.0 |
| March | 22°F (-5°C) | -3°F (-19°C) | 10°F (-12°C) | 0.8" | 30.8 | 0.0 |
| April | 37°F (3°C) | 15°F (-9°C) | 26°F (-3°C) | 0.6" | 30.0 | 0.0 |
| May | 51°F (11°C) | 30°F (-1°C) | 40°F (5°C) | 1.1" | 20.6 | 0.0 |
| June | 63°F (17°C) | 39°F (4°C) | 51°F (10°C) | 2.5" | 3.2 | 0.0 |
| July | 66°F (19°C) | 43°F (6°C) | 55°F (13°C) | 3.1" | 0.0 | 0.0 |
| August | 60°F (16°C) | 40°F (4°C) | 50°F (10°C) | 3.0" | 3.3 | 0.0 |
| September | 51°F (10°C) | 31°F (0°C) | 41°F (5°C) | 2.4" | 15.3 | 0.0 |
| October | 33°F (0°C) | 16°F (-9°C) | 24°F (-4°C) | 1.2" | 29.3 | 0.0 |
| November | 15°F (-10°C) | -4°F (-20°C) | 6°F (-15°C) | 1.4" | 30.0 | 0.0 |
| December | 11°F (-12°C) | -9°F (-23°C) | 1°F (-17°C) | 1.2" | 31.0 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 67°F around July 6, short of 90°F on every date, while 253 dates carry a normal low at or below freezing, the coldest -11°F near January 7.
The freezing stretch
The normal low stays at or below 32°F into May 22, then returns to freezing around September 13, covering 253 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.
The widest day
March 9 carries the biggest normal gap between afternoon and dawn, 26°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Glennallen.
Where Glennallen Stands Nationally
Winters bite deep and often: the normal nightly low dips to freezing or below on around 253 nights a year, placing this among the most frost-prone tenth of ranked stations.
Glennallen earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
Glennallen runs a summer-peaked wet season
46% of Glennallen's yearly precipitation falls in June, July and August alone, against the 25% an evenly spread year would give those three months. The wettest month is July at 3.1", on a wide 56.3°F gap between its warmest and coldest month. Warm-season convection and, across the Southwest, the North American monsoon produce this shape: rain arrives in short heavy bursts during the hottest part of the year rather than as long cool-season soaking.
- Wettest three months: July, August, June, taking 46% of the annual total between them.
- Driest month: February at 0.5".
- Winter share: 14% falls in December, January and February.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A summer-peaked label means the June-August share reaches 35%; it describes timing across an average year, not any single season, and says nothing about how heavy an individual storm can be.
Frost Dates & Growing Season
First Fall Freeze
August 24
50% probability date
Last Spring Freeze
June 5
50% probability date
Growing Season
80 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
14,388
Higher = more heating needed
Cooling Degree Days
1
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside AK closest to Glennallen 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 (26°F here).
- Cooke City, MT 34°F · 8.7°F off
- Crested Butte, CO 34°F · 8.7°F off
- Silver Gate, MT 34°F · 8.8°F off
- Stanley, ID 34°F · 8.9°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (18.7" here), excluding temperature-peer places.
- Chadron, NE 18.8" · 0.0" off
- Westhope, ND 18.8" · 0.0" off
- Max, ND 18.7" · 0.0" off
- Upham, ND 18.8" · 0.0" off
Data-derived climate profile
How Glennallen's climate pattern fits together
heating led · dry · high swing
Winter and seasonal range jointly define this record. Glennallen logs 14,388 heating degree days, more than twice its 1 cooling total, while the typical coldest-to-warmest-month gap reaches 56.3°F. The annual mean therefore compresses two materially different seasons.
Only about 80 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.
July and January mark the typical warm and cold ends of the calendar in this dry, high-range record. The gap is 56.3°F, so a single annual figure is especially lossy; the annual average is 26°f. Compare monthly temperature and precipitation together before drawing a seasonal conclusion about Glennallen.
Glennallen's cold-season load does not imply a wet climate. Annual precipitation is 18.7 inches, which places the station in PlainClimate's dry range. Snowfall is not added to the interpretation because its annual value is missing. The snowfall and rainfall fields should be read separately rather than inferred from temperature.
These labels group NOAA 1991-2020 normals from Glennallen'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 Glennallen, not an official NOAA class or a year-ahead forecast.
Questions about Glennallen'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 Glennallen's primary station: GLENNALLEN 64 N (USW00056401). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as a census-designated place (GEOID 0228740), not an incorporated municipality. Match rule for Glennallen: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Glennallen 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.