Trinity River Hatchery, California climate: Climate normals at a NOAA weather station
Trinity River Hatchery's normal year runs from 32°F December nights to 96°F July afternoons, with 32.4 inches of precipitation and 6 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.4°C, December lows of 0°C, July highs of 35°C, 823 mm of precipitation a year.
- NOAA stationTrinity River Hatchery
- Station IDUSC00049026
- Location40.73°N 122.79°W
- Elevation1,861 ft (567 m)
On October 23, the normal high in Trinity River Hatchery is 72°F and the normal low 37°F, and the chance of measurable rain or snow is 21%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Trinity River Hatchery.
- Jan 50° 33°
- Feb 56° 33°
- Mar 62° 35°
- Apr 68° 38°
- May 77° 44°
- Jun 87° 49°
- Jul 96° 54°
- Aug 94° 52°
- Sep 89° 46°
- Oct 76° 39°
- Nov 58° 36°
- Dec 48° 32°
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 Trinity River Hatchery each month?
July is the warmest month, with normal highs of 96°F; December the coldest, with normal lows of 32°F. The most precipitation falls in December (6.45 in), the least in August (0.14 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 50°F | 33°F | 41.4°F | 5.95 | 1.2 | 15 | <1 | 15 | 9 h 30 min |
| February | 56°F | 33°F | 44.5°F | 4.71 | 1.6 | 12 | <1 | 13 | 10 h 40 min |
| March | 62°F | 35°F | 48.4°F | 4.07 | 0.3 | 13 | <1 | 11 | 11 h 50 min |
| April | 68°F | 38°F | 52.7°F | 2.57 | 0.0 | 10 | <1 | 6 | 13 h 20 min |
| May | 77°F | 44°F | 60.6°F | 1.69 | 0.0 | 8 | 4 | 1 | 14 h 30 min |
| June | 87°F | 49°F | 67.6°F | 0.86 | 0.0 | 3 | 11 | <1 | 15 h |
| July | 96°F | 54°F | 74.8°F | 0.19 | 0.0 | 1 | 24 | <1 | 14 h 50 min |
| August | 94°F | 52°F | 73.1°F | 0.14 | 0.0 | 1 | 23 | <1 | 13 h 50 min |
| September | 89°F | 46°F | 67.2°F | 0.33 | 0.0 | 2 | 15 | <1 | 12 h 30 min |
| October | 76°F | 39°F | 57.1°F | 1.94 | 0.0 | 5 | 2 | 5 | 11 h 10 min |
| November | 58°F | 36°F | 47.0°F | 3.50 | 0.6 | 11 | <1 | 10 | 10 h |
| December | 48°F | 32°F | 40.2°F | 6.45 | 2.7 | 15 | <1 | 17 | 9 h 20 min |
| Year (annual) | 72°F | 41°F | 56.2°F | 32.40 | 6.4 | 95 | 78 | 78 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 10°C | 0°C | 5.2°C | 151 mm | 3 cm |
| February | 13°C | 0°C | 6.9°C | 120 mm | 4 cm |
| March | 16°C | 2°C | 9.1°C | 103 mm | 1 cm |
| April | 20°C | 3°C | 11.5°C | 65 mm | 0 cm |
| May | 25°C | 7°C | 15.9°C | 43 mm | 0 cm |
| June | 30°C | 9°C | 19.8°C | 22 mm | 0 cm |
| July | 35°C | 12°C | 23.8°C | 5 mm | 0 cm |
| August | 35°C | 11°C | 22.8°C | 4 mm | 0 cm |
| September | 32°C | 8°C | 19.6°C | 8 mm | 0 cm |
| October | 24°C | 4°C | 13.9°C | 49 mm | 0 cm |
| November | 15°C | 2°C | 8.3°C | 89 mm | 2 cm |
| December | 9°C | 0°C | 4.6°C | 164 mm | 7 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00049026; 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 Trinity River Hatchery?
Normal highs sit between 65°F and 85°F in April, May and October. Of those, October has the fewest days with rain (5).
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 USC00049026.
When is the last frost at Trinity River Hatchery?
In Trinity River Hatchery, the last spring frost (32°F) comes after April 23 in half of years and after May 11 in one year in ten; the first autumn frost comes before October 22 in half of years and before October 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
- April 231 year in 10 after May 11; 9 in 10 after April 3
- First autumn frost, half of years before
- October 221 year in 10 before October 4; 9 in 10 before November 13
NOAA puts the median frost-free season at 178 days, and the season without a hard freeze (28°F) at 227 days.
A hard freeze (28°F) comes after March 28 in half of springs and before November 6 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Trinity River Hatchery in zone 8b in ZIP code 96052, 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 8b: the coldest night of a typical year reaches 19°F (29 complete years).
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00049026; 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 Trinity River Hatchery?
In a normal year in Trinity River Hatchery, 78 days a year reach 90°F (17 of them 100°F or more), 78 nights fall to 32°F or colder and 95 days bring measurable precipitation.
- Days at 90°F or more
- 78a normal year
- Days at 100°F or more
- 17a normal year
- Nights at 32°F or colder
- 78a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 95a normal year
- Days with 1 inch of snow or more
- 2a normal year
The highest temperature in this station's record (since 1974) is 116°F, on July 29, 2022; the lowest is 4°F, on December 22, 1990.
The wettest calendar year on that record is 1983, with 60.66 in; the snowiest season is 2007–08, with 29.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00049026; records: ACIS (NOAA Regional Climate Centers), station USC00049026. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Trinity River Hatchery?
Over a year 85% of the sunlight that would reach the ground under clear skies gets through the clouds at Trinity River Hatchery, 5.0 kWh per square metre a day. July is the sunniest month (96%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 2.0 |
| February | 73% | 3.0 |
| March | 73% | 4.2 |
| April | 80% | 5.8 |
| May | 85% | 7.1 |
| June | 92% | 8.1 |
| July | 96% | 8.2 |
| August | 96% | 7.2 |
| September | 94% | 5.8 |
| October | 87% | 4.0 |
| November | 76% | 2.4 |
| December | 66% | 1.7 |
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 Trinity River Hatchery record?
A normal year at Trinity River Hatchery brings 4,034 heating degree days, 25% fewer than the median U.S. place (5,373), and 856 cooling degree days, 6% fewer than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,336 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 733 | 0 |
| February | 575 | 0 |
| March | 513 | 0 |
| April | 371 | 2 |
| May | 175 | 40 |
| June | 51 | 128 |
| July | 3 | 307 |
| August | 4 | 256 |
| September | 45 | 111 |
| October | 257 | 12 |
| November | 540 | 0 |
| December | 767 | 0 |
| Year (annual) | 4,034 | 856 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00049026. 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 Trinity River Hatchery been warmer than normal?
2025 averaged 58.9°F, 2.7°F above the 1991-2020 normal of 56.2°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 58.0°F | +1.8°F | 25.07 | 16.6 |
| 2022 | 57.9°F | +1.7°F | 20.14 | 2.0 |
| 2023 | 56.4°F | +0.2°F | 36.69 | 17.4 |
| 2024 | 57.8°F | +1.6°F | 44.58 | 3.2 |
| 2025 | 58.9°F | +2.7°F | 35.64 | 1.3 |
Over 43 complete years from 1975 to 2025, the station's annual mean temperature rose at a fitted 5.2°F per century (+0.29°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00049026; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Trinity River Hatchery's climate compare?
Trinity River Hatchery is warmer than 47 of the 219 places with their own NOAA record in California, and wetter than 171. Across the 7,247 U.S. stations with normals, its annual mean of 56.2°F is warmer than 64%.
In the Köppen classification computed from these normals, Trinity River 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 Trinity River Hatchery share this climate record?
4 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.
- Lewiston, CA2,434 people · 2 mi SW
- Trinity Center, CA301 people · 18 mi N
- French Gulch, CA221 people · 9 mi E
- Platina, CA27 people · 26 mi S
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 Trinity River Hatchery's climate
What is the coldest month at Trinity River Hatchery?
December, with a normal high of 48°F and a normal low of 32°F. The warmest is July (96°F by day, 54°F at night).
Does it snow at Trinity River Hatchery?
Yes: 6 inches in a normal year, falling on 4 days with 0.1 inch or more, the most in December (2.7 inches).
What is the rainiest month at Trinity River Hatchery?
December, with 6.45 in of precipitation in a normal year; the driest is August with 0.14 in.
What plant hardiness zone is Trinity River Hatchery in?
The USDA's 2023 map puts Trinity River Hatchery in zone 8b in ZIP code 96052, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 19°F (29 years, 1991-2020): zone 8b.
How late can frost come at Trinity River Hatchery?
In half of years the last 32°F night comes after April 23; in one year in ten it comes after May 11. Waiting until May 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Weaverville, CA7 miles from this station, 55.0°F a year
- Whiskeytown Reservoir, CA16 miles from this station, 62.9°F a year
- Shasta, CA20 miles from this station, 63.5°F a year
- Big Bar (4 mi E), CA22 miles from this station, 56.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made