Delta (6 mi N), Alaska climate: Climate normals at a NOAA weather station
Delta (6 mi N)'s normal year runs from −16°F January nights to 70°F July afternoons, with 12.6 inches of precipitation and 43 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of −3.4°C, January lows of −27°C, July highs of 21°C, 321 mm of precipitation a year.
- NOAA stationDelta (6 mi N)
- Station IDUSC00502339
- Location64.12°N 145.75°W
- Elevation1,059 ft (323 m)
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Delta (6 mi N).
- Jan 3° -16°
- Feb 13° -9°
- Mar 24° -6°
- Apr 44° 17°
- May 60° 32°
- Jun 69° 43°
- Jul 70° 46°
- Aug 64° 41°
- Sep 53° 29°
- Oct 32° 14°
- Nov 12° -5°
- Dec 6° -12°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Delta (6 mi N) each month?
July is the warmest month, with normal highs of 70°F; January the coldest, with normal lows of −16°F. The most precipitation falls in July (2.81 in), the least in April (0.28 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 3°F | −16°F | -6.5°F | 0.41 | 6.2 | 7 | <1 | 31 | 5 h 20 min |
| February | 13°F | −9°F | 1.8°F | 0.33 | 4.7 | 6 | <1 | 28 | 8 h 30 min |
| March | 24°F | −6°F | 8.9°F | 0.32 | 3.6 | 5 | <1 | 31 | 11 h 40 min |
| April | 44°F | 17°F | 30.5°F | 0.28 | 2.5 | 4 | <1 | 29 | 15 h |
| May | 60°F | 32°F | 45.6°F | 0.99 | 1.2 | 8 | <1 | 18 | 18 h 20 min |
| June | 69°F | 43°F | 55.7°F | 2.35 | 0.0 | 13 | <1 | 3 | 21 h |
| July | 70°F | 46°F | 58.1°F | 2.81 | 0.0 | 15 | <1 | 1 | 19 h 50 min |
| August | 64°F | 41°F | 52.3°F | 2.12 | 0.0 | 15 | <1 | 6 | 16 h 30 min |
| September | 53°F | 29°F | 41.0°F | 1.25 | 1.5 | 10 | <1 | 19 | 13 h 10 min |
| October | 32°F | 14°F | 23.0°F | 0.72 | 7.4 | 9 | <1 | 29 | 10 h |
| November | 12°F | −5°F | 3.4°F | 0.58 | 8.9 | 8 | <1 | 30 | 6 h 40 min |
| December | 6°F | −12°F | -3.3°F | 0.46 | 6.8 | 7 | <1 | 31 | 4 h 20 min |
| Year (annual) | 37°F | 14°F | 25.9°F | 12.62 | 42.8 | 107 | <1 | 256 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −16°C | −27°C | −21.4°C | 10 mm | 16 cm |
| February | −11°C | −23°C | −16.8°C | 8 mm | 12 cm |
| March | −5°C | −21°C | −12.8°C | 8 mm | 9 cm |
| April | 7°C | −8°C | −0.8°C | 7 mm | 6 cm |
| May | 15°C | 0°C | 7.6°C | 25 mm | 3 cm |
| June | 20°C | 6°C | 13.2°C | 60 mm | 0 cm |
| July | 21°C | 8°C | 14.5°C | 71 mm | 0 cm |
| August | 18°C | 5°C | 11.3°C | 54 mm | 0 cm |
| September | 12°C | −2°C | 5.0°C | 32 mm | 4 cm |
| October | 0°C | −10°C | −5.0°C | 18 mm | 19 cm |
| November | −11°C | −21°C | −15.9°C | 15 mm | 23 cm |
| December | −15°C | −24°C | −19.6°C | 12 mm | 17 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00502339; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
Which months are mildest at Delta (6 mi N)?
Normal highs sit between 65°F and 85°F in June and July. Of those, June has the fewest days with rain (13).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00502339.
How hot and how cold does it get at Delta (6 mi N)?
In a normal year in Delta (6 mi N), a 90°F day is rare, 256 nights fall to 32°F or colder and 107 days bring measurable precipitation.
- Days at 90°F or more
- fewer than 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 256a normal year
- Days that stay below freezing
- 153high of 32°F or less
- Days with 0.01 inch of precipitation
- 107a normal year
- Days with 1 inch of snow or more
- 16a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00502339.
How sunny is it at Delta (6 mi N)?
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds at Delta (6 mi N), 2.5 kWh per square metre a day. March is the sunniest month (85%) and October the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 0.2 |
| February | 77% | 0.9 |
| March | 85% | 2.6 |
| April | 83% | 4.5 |
| May | 70% | 5.0 |
| June | 65% | 5.2 |
| July | 63% | 4.6 |
| August | 65% | 3.6 |
| September | 66% | 2.3 |
| October | 62% | 1.0 |
| November | 65% | 0.3 |
| December | 81% | 0.1 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How many heating and cooling degree days does Delta (6 mi N) record?
A normal year at Delta (6 mi N) brings 14,253 heating degree days, 2.7 times the median U.S. place (5,373), and 15 cooling degree days, 98% fewer than the median (908). Ten months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 609 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 2,215 | 0 |
| February | 1,771 | 0 |
| March | 1,739 | 0 |
| April | 1,035 | 0 |
| May | 602 | 0 |
| June | 286 | 7 |
| July | 222 | 6 |
| August | 395 | 1 |
| September | 722 | 0 |
| October | 1,302 | 0 |
| November | 1,848 | 0 |
| December | 2,117 | 0 |
| Year (annual) | 14,253 | 15 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00502339. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Have recent years at Delta (6 mi N) been warmer than normal?
2023 averaged 26.8°F, 0.9°F above the 1991-2020 normal of 25.9°F. 1 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 24.4°F | −1.5°F | 16.51 | 91.6 |
| 2023 | 26.8°F | +0.9°F | 11.23 | 60.0 |
Source: observed years: ACIS, station USC00502339. A year counts only with all twelve months complete.
How does Delta (6 mi N)'s climate compare?
Delta (6 mi N) is warmer than 14 of the 85 places with their own NOAA record in Alaska, and wetter than 14. Across the 7,247 U.S. stations with normals, its annual mean of 25.9°F is warmer than 0%.
In the Köppen classification computed from these normals, Delta (6 mi N) is Dfc: continental, no dry season, cool summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Delta (6 mi N) share this climate record?
Big Delta has no NOAA station with 1991-2020 normals of its own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Big Delta, AK646 people · 3 mi N
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Delta (6 mi N)'s climate
What is the coldest month at Delta (6 mi N)?
January, with a normal high of 3°F and a normal low of −16°F. The warmest is July (70°F by day, 46°F at night).
Does it snow at Delta (6 mi N)?
Yes: 43 inches in a normal year, falling on 48 days with 0.1 inch or more, the most in November (8.9 inches).
What is the rainiest month at Delta (6 mi N)?
July, with 2.81 in of precipitation in a normal year; the driest is April with 0.28 in.
Nearby and next
- Alaska climateThe statewide normals and every place in the state
- Delta (5 mi NE), AK5 miles from this station, 27.4°F a year
- Whitestone, AK5 miles from this station, 29.6°F a year
- Delta Junction, AK9 miles from this station, 30.0°F a year
- Dry Creek, AK47 miles from this station, 27.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made