Dworshak Fish Hatchery, Idaho climate: Climate normals at a NOAA weather station
Dworshak Fish Hatchery's normal year runs from 28°F December nights to 90°F July afternoons, with 26.1 inches of precipitation and 18 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.9°C, December lows of −2°C, July highs of 32°C, 663 mm of precipitation a year.
- NOAA stationDworshak Fish Hatchery
- Station IDUSC00102845
- Location46.50°N 116.32°W
- Elevation995 ft (303 m)
On October 22, the normal high in Dworshak Fish Hatchery is 59°F and the normal low 37°F, and the chance of measurable rain or snow is 40%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Dworshak Fish Hatchery.
- Jan 40° 28°
- Feb 46° 29°
- Mar 55° 33°
- Apr 63° 38°
- May 72° 45°
- Jun 78° 51°
- Jul 90° 55°
- Aug 90° 54°
- Sep 80° 48°
- Oct 63° 39°
- Nov 48° 33°
- Dec 39° 28°
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 Dworshak Fish Hatchery each month?
July is the warmest month, with normal highs of 90°F; December the coldest, with normal lows of 28°F. The most precipitation falls in November (3.23 in), the least in August (0.68 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 40°F | 28°F | 33.8°F | 3.12 | 6.3 | 17 | <1 | 22 | 9 h |
| February | 46°F | 29°F | 37.5°F | 2.57 | 1.7 | 14 | <1 | 20 | 10 h 20 min |
| March | 55°F | 33°F | 43.7°F | 2.69 | 0.7 | 15 | <1 | 14 | 11 h 50 min |
| April | 63°F | 38°F | 50.3°F | 2.64 | 0.0 | 14 | <1 | 5 | 13 h 30 min |
| May | 72°F | 45°F | 58.2°F | 2.38 | 0.0 | 12 | 1 | <1 | 15 h |
| June | 78°F | 51°F | 64.3°F | 1.91 | 0.0 | 11 | 4 | <1 | 15 h 50 min |
| July | 90°F | 55°F | 72.2°F | 0.73 | 0.0 | 4 | 17 | <1 | 15 h 30 min |
| August | 90°F | 54°F | 72.0°F | 0.68 | 0.0 | 4 | 18 | <1 | 14 h 20 min |
| September | 80°F | 48°F | 63.7°F | 0.87 | 0.0 | 6 | 6 | <1 | 12 h 40 min |
| October | 63°F | 39°F | 51.0°F | 2.10 | 0.0 | 12 | <1 | 4 | 11 h |
| November | 48°F | 33°F | 40.0°F | 3.23 | 0.7 | 16 | <1 | 13 | 9 h 30 min |
| December | 39°F | 28°F | 33.3°F | 3.18 | 8.1 | 16 | <1 | 23 | 8 h 40 min |
| Year (annual) | 64°F | 40°F | 51.7°F | 26.10 | 17.5 | 140 | 47 | 101 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 4°C | −2°C | 1.0°C | 79 mm | 16 cm |
| February | 8°C | −2°C | 3.1°C | 65 mm | 4 cm |
| March | 13°C | 0°C | 6.5°C | 68 mm | 2 cm |
| April | 17°C | 3°C | 10.2°C | 67 mm | 0 cm |
| May | 22°C | 7°C | 14.6°C | 60 mm | 0 cm |
| June | 25°C | 10°C | 17.9°C | 49 mm | 0 cm |
| July | 32°C | 13°C | 22.3°C | 19 mm | 0 cm |
| August | 32°C | 12°C | 22.2°C | 17 mm | 0 cm |
| September | 27°C | 9°C | 17.6°C | 22 mm | 0 cm |
| October | 17°C | 4°C | 10.6°C | 53 mm | 0 cm |
| November | 9°C | 0°C | 4.4°C | 82 mm | 2 cm |
| December | 4°C | −2°C | 0.7°C | 81 mm | 21 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00102845; 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 Dworshak Fish Hatchery?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (6).
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 USC00102845.
When is the last frost at Dworshak Fish Hatchery?
In Dworshak Fish Hatchery, the last spring frost (32°F) comes after April 20 in half of years and after May 5 in one year in ten; the first autumn frost comes before October 20 in half of years and before September 30 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 201 year in 10 after May 5; 9 in 10 after April 1
- First autumn frost, half of years before
- October 201 year in 10 before September 30; 9 in 10 before November 7
NOAA puts the median frost-free season at 182 days, and the season without a hard freeze (28°F) at 219 days.
A hard freeze (28°F) comes after March 28 in half of springs and before November 2 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Dworshak Fish Hatchery in zone 7a in ZIP code 83520, 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 7b: the coldest night of a typical year reaches 8°F (27 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Idaho · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00102845; 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 Dworshak Fish Hatchery?
In a normal year in Dworshak Fish Hatchery, 47 days a year reach 90°F (8 of them 100°F or more), 101 nights fall to 32°F or colder and 140 days bring measurable precipitation.
- Days at 90°F or more
- 47a normal year
- Days at 100°F or more
- 8a normal year
- Nights at 32°F or colder
- 101a normal year
- Days that stay below freezing
- 8high of 32°F or less
- Days with 0.01 inch of precipitation
- 140a normal year
- Days with 1 inch of snow or more
- 6a normal year
The highest temperature in this station's record (since 1966) is 112°F, on June 29, 2021; the lowest is −15°F, on December 31, 1968.
The wettest calendar year on that record is 1996, with 36.55 in; the snowiest season is 1968–69, with 44.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00102845; records: ACIS (NOAA Regional Climate Centers), station USC00102845. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Dworshak Fish Hatchery?
Over a year 76% of the sunlight that would reach the ground under clear skies gets through the clouds at Dworshak Fish Hatchery, 4.0 kWh per square metre a day. July is the sunniest month (91%) and December the cloudiest (55%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 59% | 1.3 |
| February | 64% | 2.2 |
| March | 64% | 3.3 |
| April | 70% | 4.8 |
| May | 75% | 6.0 |
| June | 78% | 6.8 |
| July | 91% | 7.5 |
| August | 88% | 6.2 |
| September | 83% | 4.5 |
| October | 73% | 2.8 |
| November | 61% | 1.5 |
| December | 55% | 1.0 |
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 Dworshak Fish Hatchery record?
A normal year at Dworshak Fish Hatchery brings 5,459 heating degree days, 2% more than the median U.S. place (5,373), and 625 cooling degree days, 31% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,671 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 966 | 0 |
| February | 771 | 0 |
| March | 659 | 0 |
| April | 444 | 1 |
| May | 230 | 21 |
| June | 91 | 70 |
| July | 11 | 234 |
| August | 13 | 230 |
| September | 107 | 69 |
| October | 437 | 1 |
| November | 750 | 0 |
| December | 983 | 0 |
| Year (annual) | 5,459 | 625 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00102845. 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 Dworshak Fish Hatchery been warmer than normal?
2024 averaged 53.9°F, 2.2°F above the 1991-2020 normal of 51.7°F.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2024 | 53.9°F | +2.2°F | 23.53 | 11.3 |
Over 100 complete years from 1907 to 2024, the station's annual mean temperature rose at a fitted 0.3°F per century (+0.01°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00102845; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Dworshak Fish Hatchery's climate compare?
Dworshak Fish Hatchery is warmer than 74 of the 85 places with their own NOAA record in Idaho, and wetter than 69. Across the 7,247 U.S. stations with normals, its annual mean of 51.7°F is warmer than 48%.
In the Köppen classification computed from these normals, Dworshak Fish Hatchery is Csa: temperate, dry-summer, hot 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 Dworshak Fish Hatchery share this climate record?
2 places have no NOAA station with 1991-2020 normals of their 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.
- Orofino, ID3,285 people · 3 mi E
- Peck, ID172 people · 5 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 Dworshak Fish Hatchery's climate
What is the coldest month at Dworshak Fish Hatchery?
December, with a normal high of 39°F and a normal low of 28°F. The warmest is July (90°F by day, 55°F at night).
Does it snow at Dworshak Fish Hatchery?
Yes: 18 inches in a normal year, falling on 9 days with 0.1 inch or more, the most in December (8.1 inches).
What is the rainiest month at Dworshak Fish Hatchery?
November, with 3.23 in of precipitation in a normal year; the driest is August with 0.68 in.
What plant hardiness zone is Dworshak Fish Hatchery in?
The USDA's 2023 map puts Dworshak Fish Hatchery in zone 7a in ZIP code 83520, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 8°F (27 years, 1991-2020): zone 7b.
How late can frost come at Dworshak Fish Hatchery?
In half of years the last 32°F night comes after April 20; in one year in ten it comes after May 5. Waiting until May 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Idaho climateThe statewide normals and every place in the state
- Nezperce, ID19 miles from this station, 44.9°F a year
- Elk River, ID21 miles from this station, 44.8°F a year
- Winchester, ID23 miles from this station, 44.6°F a year
- Kamiah, ID23 miles from this station, 50.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made