Eklutna Water Treatment Plant, Alaska climate: Climate normals at a NOAA weather station
Eklutna Water Treatment Plant's normal year runs from 8°F January nights to 71°F July afternoons, with 16.6 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 2.8°C, January lows of −14°C, July highs of 21°C, 421 mm of precipitation a year.
- NOAA stationEklutna Water Treatment Plant
- Station IDUSC00502737
- Location61.45°N 149.32°W
- Elevation640 ft (195 m)
On October 23, the normal high in Eklutna Water Treatment Plant is 40°F and the normal low 23°F, and the chance of measurable rain or snow is 30%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Eklutna Water Treatment Plant.
- Jan 21° 8°
- Feb 29° 12°
- Mar 36° 15°
- Apr 50° 28°
- May 62° 36°
- Jun 69° 44°
- Jul 71° 50°
- Aug 68° 47°
- Sep 58° 39°
- Oct 44° 27°
- Nov 28° 15°
- Dec 24° 10°
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 Eklutna Water Treatment Plant each month?
July is the warmest month, with normal highs of 71°F; January the coldest, with normal lows of 8°F. The most precipitation falls in August (2.80 in), the least in April (0.47 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 21°F | 8°F | 14.3°F | 1.04 | 7 | <1 | 30 | 6 h 20 min |
| February | 29°F | 12°F | 20.5°F | 0.92 | 7 | <1 | 27 | 9 h |
| March | 36°F | 15°F | 25.3°F | 0.73 | 6 | <1 | 30 | 11 h 40 min |
| April | 50°F | 28°F | 38.8°F | 0.47 | 3 | <1 | 24 | 14 h 40 min |
| May | 62°F | 36°F | 49.0°F | 0.78 | 7 | <1 | 8 | 17 h 30 min |
| June | 69°F | 44°F | 56.6°F | 1.45 | 10 | <1 | <1 | 19 h 20 min |
| July | 71°F | 50°F | 60.0°F | 1.78 | 12 | <1 | <1 | 18 h 40 min |
| August | 68°F | 47°F | 57.5°F | 2.80 | 15 | <1 | <1 | 16 h |
| September | 58°F | 39°F | 48.5°F | 2.30 | 16 | <1 | 5 | 13 h |
| October | 44°F | 27°F | 35.3°F | 1.56 | 10 | <1 | 22 | 10 h 10 min |
| November | 28°F | 15°F | 21.2°F | 1.13 | 7 | <1 | 29 | 7 h 20 min |
| December | 24°F | 10°F | 17.2°F | 1.60 | 10 | <1 | 30 | 5 h 30 min |
| Year (annual) | 47°F | 28°F | 37.0°F | 16.56 | 111 | 1 | 205 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −6°C | −14°C | −9.8°C | 26 mm |
| February | −2°C | −11°C | −6.4°C | 23 mm |
| March | 2°C | −10°C | −3.7°C | 19 mm |
| April | 10°C | −2°C | 3.8°C | 12 mm |
| May | 17°C | 2°C | 9.4°C | 20 mm |
| June | 20°C | 7°C | 13.7°C | 37 mm |
| July | 21°C | 10°C | 15.6°C | 45 mm |
| August | 20°C | 8°C | 14.2°C | 71 mm |
| September | 14°C | 4°C | 9.2°C | 58 mm |
| October | 7°C | −3°C | 1.8°C | 40 mm |
| November | −2°C | −10°C | −6.0°C | 29 mm |
| December | −5°C | −12°C | −8.2°C | 41 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Matanuska Experiment Farm (8 miles away), gets 50 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00502737; 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 Eklutna Water Treatment Plant?
Normal highs sit between 65°F and 85°F in June, July and August. Of those, June has the fewest days with rain (10).
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 USC00502737.
When is the last frost at Eklutna Water Treatment Plant?
In Eklutna Water Treatment Plant, the last spring frost (32°F) comes after May 18 in half of years and after May 30 in one year in ten; the first autumn frost comes before September 20 in half of years and before September 4 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 181 year in 10 after May 30; 9 in 10 after May 6
- First autumn frost, half of years before
- September 201 year in 10 before September 4; 9 in 10 before October 4
NOAA puts the median frost-free season at 124 days, and the season without a hard freeze (28°F) at 150 days.
A hard freeze (28°F) comes after May 3 in half of springs and before September 30 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Eklutna Water Treatment Plant in zone 5a in ZIP code 99654, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 5a: the coldest night of a typical year reaches −16°F (16 complete years).
Frost dates for every NOAA station in Alaska · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00502737; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get at Eklutna Water Treatment Plant?
In a normal year in Eklutna Water Treatment Plant, 1 day a year reaches 90°F, 205 nights fall to 32°F or colder and 111 days bring measurable precipitation.
- Days at 90°F or more
- 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 205a normal year
- Days that stay below freezing
- 101high of 32°F or less
- Days with 0.01 inch of precipitation
- 111a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00502737.
How sunny is it at Eklutna Water Treatment Plant?
Over a year 64% of the sunlight that would reach the ground under clear skies gets through the clouds at Eklutna Water Treatment Plant, 2.5 kWh per square metre a day. April is the sunniest month (70%) and October the cloudiest (55%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 57% | 0.3 |
| February | 59% | 0.9 |
| March | 68% | 2.4 |
| April | 70% | 4.0 |
| May | 66% | 5.0 |
| June | 65% | 5.3 |
| July | 63% | 4.8 |
| August | 63% | 3.8 |
| September | 61% | 2.4 |
| October | 55% | 1.1 |
| November | 55% | 0.4 |
| December | 56% | 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 Eklutna Water Treatment Plant record?
A normal year at Eklutna Water Treatment Plant brings 10,206 heating degree days, 90% more than the median U.S. place (5,373), and 25 cooling degree days, 97% fewer than the median (908). Nine months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 847 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,572 | 0 |
| February | 1,246 | 0 |
| March | 1,229 | 0 |
| April | 786 | 0 |
| May | 496 | 0 |
| June | 258 | 6 |
| July | 169 | 14 |
| August | 237 | 5 |
| September | 497 | 0 |
| October | 919 | 0 |
| November | 1,314 | 0 |
| December | 1,483 | 0 |
| Year (annual) | 10,206 | 25 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00502737. 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 Eklutna Water Treatment Plant been warmer than normal?
2023 averaged 35.9°F, 1.1°F below the 1991-2020 normal of 37.0°F. 1 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 33.9°F | −3.1°F | 18.39 |
| 2022 | 37.2°F | +0.2°F | – |
| 2023 | 35.9°F | −1.1°F | 21.31 |
Source: observed years: ACIS, station USC00502737. A year counts only with all twelve months complete.
How does Eklutna Water Treatment Plant's climate compare?
Eklutna Water Treatment Plant is warmer than 52 of the 85 places with their own NOAA record in Alaska, and wetter than 29. Across the 7,247 U.S. stations with normals, its annual mean of 37.0°F is warmer than 2%.
In the Köppen classification computed from these normals, Eklutna Water Treatment Plant is Dsc: continental, dry-summer, 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 Eklutna Water Treatment Plant share this climate record?
Knik-Fairview 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.
- Knik-Fairview, AK18,921 people · 11 mi W
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 Eklutna Water Treatment Plant's climate
What is the coldest month at Eklutna Water Treatment Plant?
January, with a normal high of 21°F and a normal low of 8°F. The warmest is July (71°F by day, 50°F at night).
Does it snow at Eklutna Water Treatment Plant?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Matanuska Experiment Farm (8 miles away), records 50 inches of snow in a normal year.
What is the rainiest month at Eklutna Water Treatment Plant?
August, with 2.80 in of precipitation in a normal year; the driest is April with 0.47 in.
What plant hardiness zone is Eklutna Water Treatment Plant in?
The USDA's 2023 map puts Eklutna Water Treatment Plant in zone 5a in ZIP code 99654, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −16°F (16 years, 1991-2020): zone 5a.
How late can frost come at Eklutna Water Treatment Plant?
In half of years the last 32°F night comes after May 18; in one year in ten it comes after May 30. Waiting until May 30 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Alaska climateThe statewide normals and every place in the state
- Matanuska Experiment Farm, AK9 miles from this station, 36.7°F a year
- Ben's Farm, AK10 miles from this station, 36.9°F a year
- Eagle River (5 mi SE), AK11 miles from this station, 36.7°F a year
- Eagle River Gakona Circle, AK12 miles from this station, 36.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made