Delta Junction, AK Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Delta Junction's primary NOAA station, DELTA JUNCTION 20 SE.
The climate verdict for Delta Junction
Winter sets the terms in Delta Junction, Alaska. A pronounced 62.5°F seasonal swing and heating demand above twice the cooling total frame an annual average of 27°F. At 39/100 (below average) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 4% of scores.
- 27°F
- annual average temperature (NOAA normal)
- 39/100
- comfort score, above 4% of station-mapped location scores
- 11.8"
- annual precipitation · 42" snow
- 77 days
- growing season, frost-free days
Delta Junction: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00502352 · Delta Junction, AK 27°F mean · 11.8" precip
TEMP-COLD · RANK-COOL · PHOTO-FINISH · PRCP-ARID · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COLD 27°F
- RANK-COOL #69
- PHOTO-FINISH ≈ Gennallen Kcam
- PRCP-ARID 11.8"
- SWING-WIDE 63°F
- COMF-LOW 39/100
- LOAD-HEAT 13,718 HDD
- STN-1 USC00502352
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Gennallen Kcam, 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 Fox, AK 28°F
- Near Mile 42 Steese, AK 28°F
- Near Tonsina, AK 28°F
- Delta Junction (this station) 27°F
- Cold Gennallen Kcam, AK 27°F
Delta Junction 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 · Delta Junction
Delta Junction: 6/100 · grade F
Delta Junction publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Delta Junction, not an official NOAA rating. Rankings still use Comfort Score 39/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Snowfall burden | 42.2 inches/year | 26/100 · F |
| Precipitation balance | 11.8 in · 23.2 from 35 in | 18/100 · F |
| Annual temperature balance | 27.3°F · 40.2° from 67.5°F | 0/100 · F |
| Frost-free season | 77 days/year | 0/100 · F |
| Normal heat + freeze calendar | 253 calendar days | 0/100 · F |
Delta Junction · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Delta Junction is a continental Köppen climate: Dfc
Coldest-month mean -3.8°F and warmest-month mean 58.7°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
- 58.7°F
- Coldest month
- -3.8°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 Delta Junction sits across the climate record
Three NOAA fields for Delta Junction'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, Delta Junction sits in the cooler third of annual means.
- Annual precipitation
- Drier than 90%
- Delta Junction's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Wider than 99%
- Warmest-to-coldest month gap for Delta Junction is large versus 6,861 complete station-years.
How Delta Junction compares across U.S. station-mapped locations
Delta Junction's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
39 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 | 5°F (-15°C) | -13°F (-25°C) | -4°F (-20°C) | 0.4" | 6.3" | 30.9 | 0.0 |
| February | 15°F (-10°C) | -7°F (-22°C) | 4°F (-16°C) | 0.3" | 5.1" | 28.0 | 0.0 |
| March | 26°F (-4°C) | -4°F (-20°C) | 11°F (-12°C) | 0.3" | 4.4" | 31.0 | 0.0 |
| April | 46°F (8°C) | 17°F (-8°C) | 32°F (0°C) | 0.3" | 2.4" | 29.3 | 0.0 |
| May | 61°F (16°C) | 32°F (0°C) | 46°F (8°C) | 0.9" | 0.5" | 17.8 | 0.0 |
| June | 70°F (21°C) | 43°F (6°C) | 56°F (14°C) | 2.2" | 0.0" | 1.7 | 0.2 |
| July | 71°F (22°C) | 46°F (8°C) | 59°F (15°C) | 2.2" | 0.0" | 0.1 | 0.0 |
| August | 66°F (19°C) | 40°F (5°C) | 53°F (12°C) | 2.3" | 0.0" | 4.5 | 0.0 |
| September | 55°F (13°C) | 30°F (-1°C) | 42°F (6°C) | 1.2" | 1.0" | 19.5 | 0.0 |
| October | 34°F (1°C) | 15°F (-9°C) | 25°F (-4°C) | 0.8" | 8.0" | 29.5 | 0.0 |
| November | 14°F (-10°C) | -2°F (-19°C) | 6°F (-14°C) | 0.6" | 7.7" | 30.0 | 0.0 |
| December | 8°F (-13°C) | -9°F (-23°C) | -1°F (-18°C) | 0.5" | 6.8" | 31.0 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 73°F around July 1, short of 90°F on every date, while 253 dates carry a normal low at or below freezing, the coldest -14°F near January 9.
The freezing stretch
The normal low stays at or below 32°F into May 18, then returns to freezing around September 9, 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.
Where the wet dates fall
The likeliest wet date is July 11, when 43% of years recorded at least a hundredth of an inch. The driest is March 26 at 8%. Summed across the calendar, that is about 83 wet dates a year.
The widest day
March 19 carries the biggest normal gap between afternoon and dawn, 31°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Delta Junction.
Where Delta Junction 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.
Aridity defines the water calendar: about 12 inches in a normal year lands this among the driest tenth of ranked stations.
Delta Junction 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: 6.3"
4.0 days with precipitation
Snow: 5.1"
3.7 days with precipitation
Snow: 4.4"
2.5 days with precipitation
Snow: 2.4"
2.6 days with precipitation
Snow: 0.5"
6.5 days with precipitation
11.2 days with precipitation
13.7 days with precipitation
13.0 days with precipitation
Snow: 1.0"
8.9 days with precipitation
Snow: 8.0"
5.9 days with precipitation
Snow: 7.7"
5.8 days with precipitation
Snow: 6.8"
4.5 days with precipitation
Delta Junction runs a summer-peaked wet season
56% of Delta Junction'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 2.3", on a wide 62.5°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, June, July, taking 56% of the annual total between them.
- Driest month: April at 0.3".
- Winter share: 10% 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.
Delta Junction is dry, and what does fall arrives gently
Only about 82 days a year record measurable precipitation here, 23% of the calendar, and they carry 11.8" between them. At roughly 0.14 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 July at about 14 wet days; the driest is March 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 Delta Junction
Delta Junction averages 42.2 inches of snowfall a year, with October the snowiest month on the normals, spread across roughly 34 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: 42.2 inches of depth.
- Days recording measurable snow: about 34 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 36% 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
August 21
50% probability date
Last Spring Freeze
June 5
50% probability date
Growing Season
77 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
13,718
Higher = more heating needed
Cooling Degree Days
13
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside AK closest to Delta Junction 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 (27°F here).
- Cooke City, MT 34°F · 6.9°F off
- Crested Butte, CO 34°F · 6.9°F off
- Silver Gate, MT 34°F · 7.0°F off
- Stanley, ID 34°F · 7.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (11.8" here), excluding temperature-peer places.
- Flaming Gorge, UT 11.8" · 0.0" off
- Benson, AZ 11.8" · 0.0" off
- Hawthorne, CA 11.8" · 0.0" off
- Hemet, CA 11.8" · 0.0" off
Snow and freeze rhythm
When cold and snow define Delta Junction
heating led · dry · high swing
Winter and seasonal range jointly define this record. Delta Junction logs 13,718 heating degree days, more than twice its 13 cooling total, while the typical coldest-to-warmest-month gap reaches 62.5°F. The annual mean therefore compresses two materially different seasons.
Only about 77 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. Delta Junction coldest normal
January
Averaging -4°F (-20°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Delta Junction typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Delta Junction snow peak
October
Delta Junction averages 42.2 inches of snow a year, with October the snowiest month on the normals.
Questions about Delta Junction'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 Delta Junction's primary station: DELTA JUNCTION 20 SE (USC00502352). 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 an incorporated place (GEOID 0218620). Match rule for Delta Junction: 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 Delta Junction 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.