Callahan, California climate: Climate normals at a NOAA weather station
Callahan's normal year runs from 28°F December nights to 90°F July afternoons, with 20.8 inches of precipitation and 4 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.3°C, December lows of −2°C, July highs of 32°C, 528 mm of precipitation a year.
- NOAA stationCallahan
- Station IDUSC00041316
- Location41.34°N 122.82°W
- Elevation3,085 ft (940 m)
On October 23, the normal high in Callahan is 66°F and the normal low 35°F, and the chance of measurable rain or snow is 22%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Callahan.
- Jan 48° 28°
- Feb 53° 30°
- Mar 59° 32°
- Apr 65° 35°
- May 73° 40°
- Jun 81° 45°
- Jul 90° 51°
- Aug 89° 49°
- Sep 83° 43°
- Oct 70° 36°
- Nov 54° 31°
- Dec 46° 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 Callahan 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 December (3.75 in), the least in August (0.29 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 48°F | 28°F | 37.7°F | 3.48 | 0.4 | 13 | <1 | 25 | 9 h 30 min |
| February | 53°F | 30°F | 41.2°F | 2.80 | 0.0 | 11 | <1 | 21 | 10 h 40 min |
| March | 59°F | 32°F | 45.4°F | 2.38 | 1.1 | 13 | <1 | 20 | 11 h 50 min |
| April | 65°F | 35°F | 49.8°F | 1.37 | 0.3 | 10 | <1 | 14 | 13 h 20 min |
| May | 73°F | 40°F | 56.6°F | 1.55 | 0.0 | 8 | 1 | 6 | 14 h 30 min |
| June | 81°F | 45°F | 63.0°F | 0.69 | 0.0 | 4 | 3 | 1 | 15 h 10 min |
| July | 90°F | 51°F | 70.4°F | 0.47 | 0.0 | 3 | 15 | <1 | 14 h 50 min |
| August | 89°F | 49°F | 69.0°F | 0.29 | 0.0 | 2 | 11 | <1 | 13 h 50 min |
| September | 83°F | 43°F | 63.0°F | 0.38 | 0.0 | 2 | 4 | 1 | 12 h 30 min |
| October | 70°F | 36°F | 53.0°F | 1.34 | 0.0 | 6 | <1 | 13 | 11 h 10 min |
| November | 54°F | 31°F | 42.7°F | 2.27 | 1.1 | 11 | <1 | 21 | 9 h 50 min |
| December | 46°F | 28°F | 36.8°F | 3.75 | 1.5 | 13 | <1 | 25 | 9 h 10 min |
| Year (annual) | 67°F | 37°F | 52.4°F | 20.77 | 4.4 | 96 | 33 | 148 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 9°C | −2°C | 3.2°C | 88 mm | 1 cm |
| February | 12°C | −1°C | 5.1°C | 71 mm | 0 cm |
| March | 15°C | 0°C | 7.4°C | 60 mm | 3 cm |
| April | 18°C | 2°C | 9.9°C | 35 mm | 1 cm |
| May | 23°C | 5°C | 13.7°C | 39 mm | 0 cm |
| June | 27°C | 7°C | 17.2°C | 18 mm | 0 cm |
| July | 32°C | 10°C | 21.3°C | 12 mm | 0 cm |
| August | 32°C | 9°C | 20.6°C | 7 mm | 0 cm |
| September | 28°C | 6°C | 17.2°C | 10 mm | 0 cm |
| October | 21°C | 2°C | 11.7°C | 34 mm | 0 cm |
| November | 12°C | 0°C | 5.9°C | 58 mm | 3 cm |
| December | 8°C | −2°C | 2.7°C | 95 mm | 4 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00041316; 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 Callahan?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September 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 USC00041316.
When is the last frost at Callahan?
In Callahan, the last spring frost (32°F) comes after May 20 in half of years and after June 12 in one year in ten; the first autumn frost comes before October 5 in half of years and before September 20 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 201 year in 10 after June 12; 9 in 10 after May 2
- First autumn frost, half of years before
- October 51 year in 10 before September 20; 9 in 10 before October 22
NOAA puts the median frost-free season at 135 days, and the season without a hard freeze (28°F) at 176 days.
A hard freeze (28°F) comes after April 28 in half of springs and before October 22 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Callahan in zone 8a in ZIP code 96014, 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 9°F (26 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 California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00041316; 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 Callahan?
In a normal year in Callahan, 33 days a year reach 90°F (1 of them 100°F or more), 148 nights fall to 32°F or colder and 96 days bring measurable precipitation.
- Days at 90°F or more
- 33a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 148a normal year
- Days that stay below freezing
- 2high of 32°F or less
- Days with 0.01 inch of precipitation
- 96a normal year
- Days with 1 inch of snow or more
- 1a normal year
The highest temperature in this station's record (since 1953) is 106°F, on July 16, 1959; the lowest is −9°F, on December 9, 1972.
The wettest calendar year on that record is 1998, with 38.05 in; the snowiest season is 1951–52, with 82.2 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00041316; records: ACIS (NOAA Regional Climate Centers), station USC00041316. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Callahan?
Over a year 83% of the sunlight that would reach the ground under clear skies gets through the clouds at Callahan, 4.8 kWh per square metre a day. July is the sunniest month (94%) and December the cloudiest (64%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 1.9 |
| February | 71% | 2.9 |
| March | 71% | 4.0 |
| April | 76% | 5.6 |
| May | 81% | 6.9 |
| June | 89% | 8.0 |
| July | 94% | 8.1 |
| August | 94% | 7.1 |
| September | 92% | 5.7 |
| October | 85% | 3.8 |
| November | 72% | 2.3 |
| December | 64% | 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 Callahan record?
A normal year at Callahan brings 5,006 heating degree days, 7% fewer than the median U.S. place (5,373), and 423 cooling degree days, 53% 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 2,478 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 848 | 0 |
| February | 666 | 0 |
| March | 608 | 0 |
| April | 456 | 0 |
| May | 270 | 11 |
| June | 109 | 49 |
| July | 15 | 180 |
| August | 16 | 140 |
| September | 102 | 40 |
| October | 376 | 2 |
| November | 668 | 0 |
| December | 874 | 0 |
| Year (annual) | 5,006 | 423 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00041316. 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 Callahan been warmer than normal?
Over 58 complete years from 1954 to 2017, the station's annual mean temperature rose at a fitted 2.4°F per century (+0.14°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Callahan's climate compare?
Callahan is warmer than 28 of the 219 places with their own NOAA record in California, and wetter than 141. Across the 7,247 U.S. stations with normals, its annual mean of 52.4°F is warmer than 51%.
In the Köppen classification computed from these normals, Callahan 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 Callahan share this climate record?
3 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.
- Etna, CA643 people · 9 mi NW
- Coffee Creek, CA285 people · 19 mi S
- Greenview, CA46 people · 15 mi N
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 Callahan's climate
What is the coldest month at Callahan?
December, with a normal high of 46°F and a normal low of 28°F. The warmest is July (90°F by day, 51°F at night).
Does it snow at Callahan?
Yes: 4 inches in a normal year, falling on 1 days with 0.1 inch or more, the most in December (1.5 inches).
What is the rainiest month at Callahan?
December, with 3.75 in of precipitation in a normal year; the driest is August with 0.29 in.
What plant hardiness zone is Callahan in?
The USDA's 2023 map puts Callahan in zone 8a in ZIP code 96014, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 9°F (26 years, 1991-2020): zone 7b.
How late can frost come at Callahan?
In half of years the last 32°F night comes after May 20; in one year in ten it comes after June 12. Waiting until June 12 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Cecilville, CA21 miles from this station, 53.9°F a year
- Mount Shasta, CA25 miles from this station, 50.3°F a year
- Yreka, CA27 miles from this station, 53.5°F a year
- Dunsmuir, CA30 miles from this station, 53.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made