Keystone Ridge, 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 Keystone Ridge's primary NOAA station, KEYSTONE RIDGE.
The climate verdict for Keystone Ridge
Winter sets the terms in Keystone Ridge, Alaska. A pronounced 55.7°F seasonal swing and heating demand above twice the cooling total frame an annual average of 31°F. At 34/100 (below average) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 2% of scores.
- 31°F
- yearly average temperature, NOAA normal
- 34/100
- comfort score, above 2% of station-mapped location scores
- 17.2"
- annual precipitation · 78" snow
- 124 days
- frost-free days per growing season
Keystone Ridge: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00504621 · Keystone Ridge, AK 31°F mean · 17.2" precip
TEMP-COLD · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COLD 31°F
- RANK-COOL #69
- PHOTO-FINISH ≈ Yellowstone Lake
- PRCP-DRY 17.2"
- SWING-WIDE 56°F
- COMF-LOW 34/100
- LOAD-HEAT 12,363 HDD
- STN-1 USC00504621
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Yellowstone Lake, WY (+ 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.
- Hot Yellowstone Lake, WY 32°F
- Keystone Ridge (this station) 31°F
- Cold Chulitna Rvr, AK 30°F
- Near Puntilla, AK 30°F
- Near Nenana, AK 30°F
Keystone Ridge 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 · Keystone Ridge
Keystone Ridge: 11/100 · grade F
Keystone Ridge publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Keystone Ridge, not an official NOAA rating. Rankings still use Comfort Score 34/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 17.2 in · 17.8 from 35 in | 37/100 · F |
| Frost-free season | 124 days/year | 9/100 · F |
| Normal heat + freeze calendar | 213 calendar days | 8/100 · F |
| Snowfall burden | 77.8 inches/year | 7/100 · F |
| Annual temperature balance | 31.2°F · 36.3° from 67.5°F | 0/100 · F |
Keystone Ridge · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Keystone Ridge is a continental Köppen climate: Dfc
Coldest-month mean 4.3°F and warmest-month mean 60.0°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
- 60.0°F
- Coldest month
- 4.3°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 Keystone Ridge sits across the climate record
Three NOAA fields for Keystone Ridge's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 99%
- Among 6,861 stations, Keystone Ridge sits in the cooler third of annual means.
- Annual precipitation
- Drier than 77%
- Keystone Ridge's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Wider than 93%
- Warmest-to-coldest month gap for Keystone Ridge is large versus 6,861 complete station-years.
How Keystone Ridge compares across U.S. station-mapped locations
Keystone Ridge's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
34 2nd percentile score exceeds 2% 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%). This entry sits in this band.
- 40–50: 1,113 station-mapped locations (18%). Above this entry.
- 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 | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 10°F (-12°C) | -1°F (-19°C) | 4°F (-15°C) | 0.7" | 9.5" | 30.7 | 0.0 |
| February | 17°F (-8°C) | 4°F (-15°C) | 11°F (-12°C) | 0.7" | 11.6" | 27.8 | 0.0 |
| March | 23°F (-5°C) | 8°F (-13°C) | 16°F (-9°C) | 0.6" | 7.8" | 30.6 | 0.0 |
| April | 42°F (5°C) | 25°F (-4°C) | 33°F (1°C) | 0.6" | 6.5" | 23.4 | 0.0 |
| May | 58°F (14°C) | 38°F (4°C) | 48°F (9°C) | 1.0" | 2.0" | 6.9 | 0.0 |
| June | 68°F (20°C) | 49°F (9°C) | 59°F (15°C) | 2.6" | 0.0" | 0.2 | 0.0 |
| July | 69°F (21°C) | 51°F (11°C) | 60°F (16°C) | 3.0" | 0.0" | 0.0 | 0.0 |
| August | 61°F (16°C) | 47°F (8°C) | 54°F (12°C) | 3.2" | 0.0" | 0.4 | 0.0 |
| September | 50°F (10°C) | 37°F (3°C) | 43°F (6°C) | 2.0" | 2.7" | 7.3 | 0.0 |
| October | 32°F (0°C) | 22°F (-6°C) | 27°F (-3°C) | 1.0" | 11.1" | 26.4 | 0.0 |
| November | 18°F (-8°C) | 7°F (-14°C) | 12°F (-11°C) | 1.1" | 15.4" | 29.7 | 0.0 |
| December | 14°F (-10°C) | 2°F (-17°C) | 8°F (-14°C) | 0.7" | 11.2" | 30.8 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 71°F around June 28, short of 90°F on every date, while 213 dates carry a normal low at or below freezing, the coldest -3°F near January 9.
The freezing stretch
The normal low stays at or below 32°F into April 28, then returns to freezing around September 29, covering 213 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 August 6, when 55% of years recorded at least a hundredth of an inch. The driest is April 5 at 19%. Summed across the calendar, that is about 129 wet dates a year.
The widest day
June 2 carries the biggest normal gap between afternoon and dawn, 20°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Keystone Ridge.
Where Keystone Ridge Stands Nationally
Winters bite deep and often: the normal nightly low dips to freezing or below on around 213 nights a year, placing this among the most frost-prone tenth of ranked stations.
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 20°F.
Keystone Ridge 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: 9.5"
9.1 days with precipitation
Snow: 11.6"
7.5 days with precipitation
Snow: 7.8"
6.9 days with precipitation
Snow: 6.5"
5.4 days with precipitation
Snow: 2.0"
9.2 days with precipitation
13.2 days with precipitation
15.7 days with precipitation
17.1 days with precipitation
Snow: 2.7"
13.5 days with precipitation
Snow: 11.1"
11.3 days with precipitation
Snow: 15.4"
10.0 days with precipitation
Snow: 11.2"
9.4 days with precipitation
Keystone Ridge runs a summer-peaked wet season
51% of Keystone Ridge'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 August at 3.2", on a wide 55.7°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: August, July, June, taking 51% of the annual total between them.
- Driest month: April at 0.6".
- Winter share: 13% 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.
Rain reaches Keystone Ridge in small, frequent amounts
Keystone Ridge records about 128 days with measurable precipitation a year and 17.2" in total, which works out to roughly 0.13 inches on an average wet day. Precipitation on 35% 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: August, about 17 of them.
- Fewest: April, about 5.
- Average depth per wet day: 0.13 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 Keystone Ridge
Keystone Ridge averages 77.8 inches of snowfall a year, with November the snowiest month on the normals, spread across roughly 69 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: 77.8 inches of depth.
- Days recording measurable snow: about 69 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 45% 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 16
50% probability date
Last Spring Freeze
May 15
50% probability date
Growing Season
124 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
12,363
Higher = more heating needed
Cooling Degree Days
50
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside AK closest to Keystone Ridge 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 (31°F here).
- Cooke City, MT 34°F · 3.0°F off
- Crested Butte, CO 34°F · 3.0°F off
- Silver Gate, MT 34°F · 3.1°F off
- Stanley, ID 34°F · 3.2°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (17.2" here), excluding temperature-peer places.
- Cimarron, NM 17.2" · 0.0" off
- Miami, AZ 17.2" · 0.0" off
- Holly, CO 17.3" · 0.0" off
- Seminole, TX 17.2" · 0.0" off
Snow and freeze rhythm
When cold and snow define Keystone Ridge
heating led · dry · high swing
Winter and seasonal range jointly define this record. Keystone Ridge logs 12,363 heating degree days, more than twice its 50 cooling total, while the typical coldest-to-warmest-month gap reaches 55.7°F. The annual mean therefore compresses two materially different seasons.
Only about 124 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. Keystone Ridge coldest normal
January
Averaging 4°F (-15°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Keystone Ridge typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Keystone Ridge snow peak
November
Keystone Ridge averages 77.8 inches of snow a year, with November the snowiest month on the normals.
Questions about Keystone Ridge'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 Keystone Ridge's primary station: KEYSTONE RIDGE (USC00504621). 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 Keystone Ridge; 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 Keystone Ridge 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.