Hidden Falls Hatchery, Alaska climate: Climate normals at a NOAA weather station
Hidden Falls Hatchery's normal year runs from 28°F January nights to 60°F July afternoons, with 128.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.7°C, January lows of −2°C, July highs of 16°C, 3,253 mm of precipitation a year.
- NOAA stationHidden Falls Hatchery
- Station IDUSC00503605
- Location57.22°N 134.88°W
- Elevation22 ft (7 m)
On October 23, the normal high in Hidden Falls Hatchery is 45°F and the normal low 37°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hidden Falls Hatchery.
- Jan 35° 28°
- Feb 36° 28°
- Mar 39° 29°
- Apr 46° 34°
- May 53° 40°
- Jun 58° 47°
- Jul 60° 50°
- Aug 60° 50°
- Sep 55° 46°
- Oct 47° 39°
- Nov 39° 32°
- Dec 36° 30°
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 Hidden Falls Hatchery each month?
July is the warmest month, with normal highs of 60°F; January the coldest, with normal lows of 28°F. The most precipitation falls in November (18.98 in), the least in June (4.03 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 35°F | 28°F | 31.3°F | 13.57 | – | <1 | 22 | 7 h 20 min |
| February | 36°F | 28°F | 32.0°F | 9.27 | – | <1 | 21 | 9 h 30 min |
| March | 39°F | 29°F | 34.0°F | 10.66 | – | <1 | 23 | 11 h 40 min |
| April | 46°F | 34°F | 39.6°F | 8.11 | – | <1 | 13 | 14 h 10 min |
| May | 53°F | 40°F | 46.8°F | 4.77 | – | <1 | 1 | 16 h 30 min |
| June | 58°F | 47°F | 52.3°F | 4.03 | – | <1 | <1 | 17 h 50 min |
| July | 60°F | 50°F | 55.0°F | 5.06 | – | <1 | <1 | 17 h 20 min |
| August | 60°F | 50°F | 55.0°F | 6.90 | – | <1 | <1 | 15 h 20 min |
| September | 55°F | 46°F | 50.5°F | 12.94 | – | <1 | <1 | 12 h 50 min |
| October | 47°F | 39°F | 43.1°F | 15.96 | – | <1 | 3 | 10 h 30 min |
| November | 39°F | 32°F | 35.6°F | 18.98 | – | <1 | 15 | 8 h 10 min |
| December | 36°F | 30°F | 32.9°F | 17.83 | – | <1 | 22 | 6 h 40 min |
| Year (annual) | 47°F | 38°F | 42.3°F | 128.08 | – | <1 | 120 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 2°C | −2°C | −0.4°C | 345 mm |
| February | 2°C | −2°C | 0.0°C | 235 mm |
| March | 4°C | −1°C | 1.1°C | 271 mm |
| April | 8°C | 1°C | 4.2°C | 206 mm |
| May | 12°C | 5°C | 8.2°C | 121 mm |
| June | 14°C | 8°C | 11.3°C | 102 mm |
| July | 16°C | 10°C | 12.8°C | 129 mm |
| August | 15°C | 10°C | 12.8°C | 175 mm |
| September | 13°C | 8°C | 10.3°C | 329 mm |
| October | 8°C | 4°C | 6.2°C | 405 mm |
| November | 4°C | 0°C | 2.0°C | 482 mm |
| December | 2°C | −1°C | 0.5°C | 453 mm |
NOAA publishes no 1991-2020 snowfall normal for this station, and no record within 25 miles keeps one, so snow is left out here rather than estimated.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00503605; 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 Hidden Falls Hatchery?
No month's normal high reaches 65°F in Hidden Falls Hatchery: the warmest is July at 60°F.
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 USC00503605.
When is the last frost at Hidden Falls Hatchery?
In Hidden Falls Hatchery, the last spring frost (32°F) comes after April 29 in half of years and after May 15 in one year in ten; the first autumn frost comes before October 25 in half of years and before October 7 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
- April 291 year in 10 after May 15; 9 in 10 after April 15
- First autumn frost, half of years before
- October 251 year in 10 before October 7; 9 in 10 before November 10
NOAA puts the median frost-free season at 176 days, and the season without a hard freeze (28°F) at 212 days.
A hard freeze (28°F) comes after April 10 in half of springs and before November 9 in half of autumns.
Frost dates for every NOAA station in Alaska · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00503605. 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 Hidden Falls Hatchery?
In a normal year in Hidden Falls Hatchery, a 90°F day is rare and 120 nights fall to 32°F or colder.
- 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
- 120a normal year
- Days that stay below freezing
- 29high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00503605.
How sunny is it at Hidden Falls Hatchery?
Over a year 55% of the sunlight that would reach the ground under clear skies gets through the clouds at Hidden Falls Hatchery, 2.3 kWh per square metre a day. April is the sunniest month (61%) and December the cloudiest (45%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 46% | 0.4 |
| February | 55% | 1.1 |
| March | 58% | 2.2 |
| April | 61% | 3.6 |
| May | 60% | 4.5 |
| June | 55% | 4.5 |
| July | 51% | 3.9 |
| August | 54% | 3.3 |
| September | 52% | 2.2 |
| October | 49% | 1.2 |
| November | 46% | 0.5 |
| December | 45% | 0.3 |
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 Hidden Falls Hatchery record?
A normal year at Hidden Falls Hatchery brings 8,252 heating degree days, 54% more than the median U.S. place (5,373), and 0 cooling degree days, 100% fewer than the median (908). Twelve months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 461 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,046 | 0 |
| February | 925 | 0 |
| March | 963 | 0 |
| April | 762 | 0 |
| May | 564 | 0 |
| June | 383 | 0 |
| July | 309 | 0 |
| August | 310 | 0 |
| September | 435 | 0 |
| October | 679 | 0 |
| November | 882 | 0 |
| December | 995 | 0 |
| Year (annual) | 8,252 | 0 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00503605. 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.
How does Hidden Falls Hatchery's climate compare?
Hidden Falls Hatchery is warmer than 70 of the 85 places with their own NOAA record in Alaska, and wetter than 69. Across the 7,247 U.S. stations with normals, its annual mean of 42.3°F is warmer than 10%.
In the Köppen classification computed from these normals, Hidden Falls Hatchery is Dfb: continental, no dry season, warm 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 Hidden Falls Hatchery share this climate record?
Angoon 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.
- Angoon, AK341 people · 21 mi NE
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 Hidden Falls Hatchery's climate
What is the coldest month at Hidden Falls Hatchery?
January, with a normal high of 35°F and a normal low of 28°F. The warmest is July (60°F by day, 50°F at night).
What is the rainiest month at Hidden Falls Hatchery?
November, with 18.98 in of precipitation in a normal year; the driest is June with 4.03 in.
How late can frost come at Hidden Falls Hatchery?
In half of years the last 32°F night comes after April 29; in one year in ten it comes after May 15. Waiting until May 15 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Alaska climateThe statewide normals and every place in the state
- Sitka, AK22 miles from this station, 45.4°F a year
- Little Port Walter, AK58 miles from this station, 44.1°F a year
- Hoonah, AK65 miles from this station, 43.1°F a year
- Port Alexander, AK68 miles from this station, 45.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made