Mccarthy, 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 Mccarthy's primary NOAA station, MCCARTHY 3 SW.
The climate verdict for Mccarthy
Winter sets the terms in Mccarthy, Alaska. A pronounced 58.9°F seasonal swing and heating demand above twice the cooling total frame an annual average of 30°F. At 35/100 (below average) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 4% of scores.
- 30°F
- average temperature, NOAA 1991-2020 normal
- 35/100
- comfort score, above 4% of station-mapped location scores
- 17.7"
- annual precipitation · 67" snow
Mccarthy: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00505757 · Mccarthy, AK 30°F mean · 17.7" precip
TEMP-COLD · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COLD 30°F
- RANK-COOL #69
- PHOTO-FINISH ≈ Puntilla
- PRCP-DRY 17.7"
- SWING-WIDE 59°F
- COMF-LOW 35/100
- LOAD-HEAT 12,788 HDD
- STN-1 USC00505757
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Puntilla, AK (+ 0.2 °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 Fort Knox Mine, AK 31°F
- Mccarthy (this station) 30°F
- Cold Whitestone Farms, AK 30°F
- Near Puntilla, AK 30°F
- Near Nenana, AK 30°F
Mccarthy 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 · Mccarthy
Mccarthy: 9/100 · grade F
Mccarthy publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Mccarthy, not an official NOAA rating. Rankings still use Comfort Score 35/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 17.7 in · 17.3 from 35 in | 38/100 · F |
| Snowfall burden | 66.5 inches/year | 12/100 · F |
| Annual temperature balance | 29.9°F · 37.6° from 67.5°F | 0/100 · F |
| Normal heat + freeze calendar | 245 calendar days | 0/100 · F |
Mccarthy · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Mccarthy is a continental Köppen climate: Dsc
Coldest-month mean -1.6°F and warmest-month mean 57.3°F place this station in continental, dry-summer, cool summer climates (Dsc). Class Dsc is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, dry-summer, cool summer.
- Köppen code
- Dsc
- Group
- Continental
- Warmest month
- 57.3°F
- Coldest month
- -1.6°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 Mccarthy sits across the climate record
Three NOAA fields for Mccarthy'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, Mccarthy sits in the cooler third of annual means.
- Annual precipitation
- Drier than 76%
- Mccarthy's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Wider than 97%
- Warmest-to-coldest month gap for Mccarthy is large versus 6,861 complete station-years.
How Mccarthy compares across U.S. station-mapped locations
Mccarthy's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
35 4th percentile score exceeds 4% 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 | 6°F (-14°C) | -9°F (-23°C) | -2°F (-19°C) | 0.9" | 13.2" | 30.9 | 0.0 |
| February | 21°F (-6°C) | -1°F (-18°C) | 10°F (-12°C) | 1.1" | 7.9" | 27.9 | 0.0 |
| March | 33°F (0°C) | 4°F (-16°C) | 18°F (-8°C) | 0.4" | 5.4" | 31.0 | 0.0 |
| April | 48°F (9°C) | 22°F (-6°C) | 35°F (1°C) | 0.3" | 2.5" | 28.8 | 0.0 |
| May | 62°F (17°C) | 31°F (-1°C) | 47°F (8°C) | 0.9" | 0.6" | 20.9 | 0.0 |
| June | 70°F (21°C) | 39°F (4°C) | 54°F (12°C) | 1.6" | 0.0" | 5.6 | 0.0 |
| July | 71°F (22°C) | 43°F (6°C) | 57°F (14°C) | 2.5" | 0.0" | 0.8 | 0.0 |
| August | 67°F (19°C) | 40°F (5°C) | 54°F (12°C) | 2.6" | 0.0" | 5.3 | 0.0 |
| September | 56°F (13°C) | 33°F (1°C) | 44°F (7°C) | 2.6" | 2.7" | 16.1 | 0.0 |
| October | 39°F (4°C) | 20°F (-7°C) | 29°F (-1°C) | 2.2" | 9.4" | 28.4 | 0.0 |
| November | 17°F (-8°C) | 2°F (-17°C) | 10°F (-12°C) | 1.4" | 13.5" | 29.8 | 0.0 |
| December | 9°F (-13°C) | -4°F (-20°C) | 2°F (-16°C) | 1.1" | 11.3" | 30.8 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 72°F around July 8, short of 90°F on every date, while 245 dates carry a normal low at or below freezing, the coldest -11°F near January 9.
The freezing stretch
The normal low stays at or below 32°F into May 23, then returns to freezing around September 22, covering 245 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 26, when 54% of years recorded at least a hundredth of an inch. The driest is April 7 at 10%. Summed across the calendar, that is about 118 wet dates a year.
The widest day
May 28 carries the biggest normal gap between afternoon and dawn, 33°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Mccarthy.
Where Mccarthy Stands Nationally
Winters bite deep and often: the normal nightly low dips to freezing or below on around 245 nights a year, placing this among the most frost-prone tenth of ranked stations.
Daily temperature swings run wider than most of the country, peaking near 33°F between the normal high and low.
Mccarthy 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: 13.2"
8.7 days with precipitation
Snow: 7.9"
7.1 days with precipitation
Snow: 5.4"
4.7 days with precipitation
Snow: 2.5"
2.8 days with precipitation
Snow: 0.6"
7.0 days with precipitation
11.3 days with precipitation
14.0 days with precipitation
16.4 days with precipitation
Snow: 2.7"
15.4 days with precipitation
Snow: 9.4"
11.2 days with precipitation
Snow: 13.5"
10.1 days with precipitation
Snow: 11.3"
9.3 days with precipitation
Mccarthy runs a summer-peaked wet season
38% of Mccarthy'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 2.6", on a wide 58.9°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, September, July, taking 43% of the annual total between them.
- Driest month: April at 0.3".
- Winter share: 18% 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.
Mccarthy is dry, and what does fall arrives gently
Only about 118 days a year record measurable precipitation here, 32% of the calendar, and they carry 17.7" between them. At roughly 0.15 inches on an average wet day, this is not the damp drizzle of a marine climate; it is an arid record in which precipitation is both uncommon and light when it appears.
The wettest month by count is August at about 16 wet days; the driest is April at about 3.
A low per-event average in a dry record is a statement about typical days only. Arid regions can still take a large share of a year's total from a single convective storm, which a normal cannot show.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, not the extremes within it.
Winter brings real snow to Mccarthy
Mccarthy averages 66.5 inches of snowfall a year, with November the snowiest month on the normals, spread across roughly 47 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: 66.5 inches of depth.
- Days recording measurable snow: about 47 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 38% 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
N/A
50% probability date
Last Spring Freeze
N/A
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
12,788
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 Mccarthy 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 (30°F here).
- Cooke City, MT 34°F · 4.3°F off
- Crested Butte, CO 34°F · 4.3°F off
- Silver Gate, MT 34°F · 4.4°F off
- Stanley, ID 34°F · 4.5°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (17.7" here), excluding temperature-peer places.
- Dumas, TX 17.7" · 0.0" off
- Hartley, TX 17.7" · 0.0" off
- Jerome, AZ 17.7" · 0.0" off
- Lusk, WY 17.7" · 0.0" off
Snow and freeze rhythm
When cold and snow define Mccarthy
heating led · dry · high swing
Winter and seasonal range jointly define this record. Mccarthy logs 12,788 heating degree days, more than twice its 1 cooling total, while the typical coldest-to-warmest-month gap reaches 58.9°F. The annual mean therefore compresses two materially different seasons.
A frost-free growing-season length is not available for Mccarthy. That missing field is kept separate from the observed temperature and precipitation record rather than filled from a regional estimate.
-
1. Mccarthy coldest normal
January
Averaging -2°F (-19°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Mccarthy typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Mccarthy snow peak
November
Mccarthy averages 66.5 inches of snow a year, with November the snowiest month on the normals.
Questions about Mccarthy's climate
How much snow does Mccarthy get? ▼
How cold does Mccarthy get in winter? ▼
How much energy does heating and cooling require in Mccarthy? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Mccarthy's primary station: MCCARTHY 3 SW (USC00505757). 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 0245790), not an incorporated municipality. Match rule for Mccarthy: 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 Mccarthy 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.