Grizzly Creek State Park, California climate: Climate normals at a NOAA weather station
Grizzly Creek State Park's normal year runs from 38°F December nights to 73°F August afternoons, with 52.3 inches of precipitation and less than an inch of snow (0.7 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.6°C, December lows of 3°C, August highs of 23°C, 1,327 mm of precipitation a year.
- NOAA stationGrizzly Creek State Park
- Station IDUSC00043647
- Location40.49°N 123.91°W
- Elevation413 ft (126 m)
On October 23, the normal high in Grizzly Creek State Park is 60°F and the normal low 44°F, and the chance of measurable rain or snow is 25%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Grizzly Creek State Park.
- Jan 50° 38°
- Feb 52° 39°
- Mar 55° 41°
- Apr 60° 43°
- May 65° 48°
- Jun 69° 50°
- Jul 73° 53°
- Aug 73° 53°
- Sep 72° 49°
- Oct 63° 45°
- Nov 54° 40°
- Dec 49° 38°
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 Grizzly Creek State Park each month?
August is the warmest month, with normal highs of 73°F; December the coldest, with normal lows of 38°F. The most precipitation falls in December (10.72 in), the least in July (0.09 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 50°F | 38°F | 43.9°F | 8.57 | 16 | <1 | 6 | 9 h 30 min |
| February | 52°F | 39°F | 45.5°F | 8.87 | 14 | <1 | 4 | 10 h 40 min |
| March | 55°F | 41°F | 47.9°F | 6.64 | 15 | <1 | 1 | 11 h 50 min |
| April | 60°F | 43°F | 51.2°F | 4.91 | 13 | <1 | 1 | 13 h 10 min |
| May | 65°F | 48°F | 56.3°F | 2.11 | 9 | <1 | <1 | 14 h 20 min |
| June | 69°F | 50°F | 59.5°F | 0.73 | 5 | <1 | <1 | 15 h |
| July | 73°F | 53°F | 62.8°F | 0.09 | 2 | <1 | <1 | 14 h 50 min |
| August | 73°F | 53°F | 63.2°F | 0.09 | 2 | <1 | <1 | 13 h 50 min |
| September | 72°F | 49°F | 60.7°F | 0.51 | 2 | <1 | <1 | 12 h 30 min |
| October | 63°F | 45°F | 53.9°F | 2.63 | 6 | <1 | <1 | 11 h 10 min |
| November | 54°F | 40°F | 47.0°F | 6.38 | 13 | <1 | 5 | 10 h |
| December | 49°F | 38°F | 43.0°F | 10.72 | 15 | <1 | 7 | 9 h 20 min |
| Year (annual) | 61°F | 45°F | 52.9°F | 52.25 | 112 | <1 | 23 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 10°C | 3°C | 6.6°C | 218 mm |
| February | 11°C | 4°C | 7.5°C | 225 mm |
| March | 13°C | 5°C | 8.8°C | 169 mm |
| April | 15°C | 6°C | 10.7°C | 125 mm |
| May | 18°C | 9°C | 13.5°C | 54 mm |
| June | 20°C | 10°C | 15.3°C | 19 mm |
| July | 23°C | 11°C | 17.1°C | 2 mm |
| August | 23°C | 12°C | 17.3°C | 2 mm |
| September | 22°C | 10°C | 15.9°C | 13 mm |
| October | 17°C | 7°C | 12.2°C | 67 mm |
| November | 12°C | 5°C | 8.3°C | 162 mm |
| December | 9°C | 3°C | 6.1°C | 272 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00043647; 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 Grizzly Creek State Park?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, August has the fewest days with rain (2).
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 USC00043647.
When is the last frost at Grizzly Creek State Park?
In Grizzly Creek State Park, the last spring frost (32°F) comes after March 4 in half of years and after April 8 in one year in ten; the first autumn frost comes before November 22 in half of years and before November 1 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
- March 41 year in 10 after April 8; 9 in 10 after January 27
- First autumn frost, half of years before
- November 221 year in 10 before November 1; 9 in 10 before December 15
NOAA puts the median frost-free season at 264 days, and the season without a hard freeze (28°F) at 330 days.
A hard freeze (28°F) comes after January 19 in half of springs and before December 8 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Grizzly Creek State Park in zone 9b in ZIP code 95528, the nearest ZIP area.
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00043647; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Grizzly Creek State Park?
In a normal year in Grizzly Creek State Park, a 90°F day is rare, 23 nights fall to 32°F or colder and 112 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
- 23a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 112a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00043647.
How sunny is it at Grizzly Creek State Park?
Over a year 83% of the sunlight that would reach the ground under clear skies gets through the clouds at Grizzly Creek State Park, 4.9 kWh per square metre a day. July is the sunniest month (95%) and December the cloudiest (63%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 68% | 2.0 |
| February | 70% | 2.9 |
| March | 70% | 4.1 |
| April | 76% | 5.5 |
| May | 82% | 6.9 |
| June | 89% | 7.9 |
| July | 95% | 8.1 |
| August | 95% | 7.2 |
| September | 92% | 5.7 |
| October | 85% | 3.9 |
| November | 73% | 2.4 |
| December | 63% | 1.6 |
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 Grizzly Creek State Park record?
A normal year at Grizzly Creek State Park brings 4,430 heating degree days, 18% fewer than the median U.S. place (5,373), and 34 cooling degree days, 96% 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 1,908 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 653 | 0 |
| February | 545 | 0 |
| March | 532 | 0 |
| April | 414 | 0 |
| May | 274 | 3 |
| June | 167 | 4 |
| July | 77 | 10 |
| August | 70 | 13 |
| September | 135 | 4 |
| October | 346 | 0 |
| November | 539 | 0 |
| December | 680 | 0 |
| Year (annual) | 4,430 | 34 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00043647. 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 Grizzly Creek State Park's climate compare?
Grizzly Creek State Park is warmer than 32 of the 219 places with their own NOAA record in California, and wetter than 204. Across the 7,247 U.S. stations with normals, its annual mean of 52.9°F is warmer than 53%.
In the Köppen classification computed from these normals, Grizzly Creek State Park is Csb: temperate, dry-summer, 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 Grizzly Creek State Park 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.
- Mad River, CA544 people · 22 mi E
- Myers Flat, CA189 people · 15 mi S
- Weott, CA84 people · 11 mi S
- Redcrest, CA15 people · 6 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 Grizzly Creek State Park's climate
What is the coldest month at Grizzly Creek State Park?
December, with a normal high of 49°F and a normal low of 38°F. The warmest is August (73°F by day, 53°F at night).
Does it snow at Grizzly Creek State Park?
Rarely: NOAA's normal is 0.7 inch a year.
What is the rainiest month at Grizzly Creek State Park?
December, with 10.72 in of precipitation in a normal year; the driest is July with 0.09 in.
What plant hardiness zone is Grizzly Creek State Park in?
The USDA's 2023 map puts Grizzly Creek State Park in zone 9b in ZIP code 95528, the nearest ZIP area.
How late can frost come at Grizzly Creek State Park?
In half of years the last 32°F night comes after March 4; in one year in ten it comes after April 8. Waiting until April 8 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Scotia, CA10 miles from this station, 55.6°F a year
- Eureka, CA26 miles from this station, 52.6°F a year
- Richardson Grove State Park, CA32 miles from this station, 56.1°F a year
- Shelter Cove, CA32 miles from this station, 56.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made