Blythe, California climate: Normal weather by month, frost dates and records
Blythe's normal year runs from 42°F December nights to 109°F July afternoons, with 3.6 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 23.6°C, December lows of 5°C, July highs of 43°C, 90 mm of precipitation a year.
- NOAA stationBlythe Airport
- Station IDUSW00023158
- Location33.62°N 114.71°W
- Elevation395 ft (120 m)
- Population17,320
On October 23, the normal high in Blythe is 87°F and the normal low 58°F, and the chance of measurable rain or snow is 4%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Blythe.
- Jan 68° 43°
- Feb 72° 46°
- Mar 80° 52°
- Apr 87° 57°
- May 96° 65°
- Jun 105° 73°
- Jul 109° 82°
- Aug 108° 82°
- Sep 102° 74°
- Oct 90° 61°
- Nov 77° 49°
- Dec 66° 42°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Blythe each month?
July is the warmest month, with normal highs of 109°F; December the coldest, with normal lows of 42°F. The most precipitation falls in February (0.62 in), the least in June (0.01 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 68°F | 43°F | 55.7°F | 0.53 | 3 | <1 | 1 | 10 h 10 min |
| February | 72°F | 46°F | 59.3°F | 0.62 | 3 | <1 | 1 | 11 h |
| March | 80°F | 52°F | 65.6°F | 0.48 | 2 | 4 | <1 | 12 h |
| April | 87°F | 57°F | 72.1°F | 0.09 | 1 | 12 | <1 | 13 h |
| May | 96°F | 65°F | 80.3°F | 0.05 | 1 | 24 | <1 | 13 h 50 min |
| June | 105°F | 73°F | 89.2°F | 0.01 | <1 | 29 | <1 | 14 h 20 min |
| July | 109°F | 82°F | 95.0°F | 0.26 | 2 | 31 | <1 | 14 h 10 min |
| August | 108°F | 82°F | 94.7°F | 0.40 | 2 | 31 | <1 | 13 h 30 min |
| September | 102°F | 74°F | 88.0°F | 0.32 | 2 | 29 | <1 | 12 h 30 min |
| October | 90°F | 61°F | 75.4°F | 0.16 | 1 | 18 | <1 | 11 h 20 min |
| November | 77°F | 49°F | 62.9°F | 0.21 | 1 | 1 | <1 | 10 h 30 min |
| December | 66°F | 42°F | 54.0°F | 0.43 | 2 | <1 | 1 | 10 h |
| Year (annual) | 88°F | 61°F | 74.4°F | 3.56 | 18 | 179 | 3 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 20°C | 6°C | 13.2°C | 13 mm |
| February | 22°C | 8°C | 15.2°C | 16 mm |
| March | 26°C | 11°C | 18.7°C | 12 mm |
| April | 31°C | 14°C | 22.3°C | 2 mm |
| May | 35°C | 18°C | 26.8°C | 1 mm |
| June | 41°C | 23°C | 31.8°C | 0 mm |
| July | 43°C | 28°C | 35.0°C | 7 mm |
| August | 42°C | 28°C | 34.8°C | 10 mm |
| September | 39°C | 23°C | 31.1°C | 8 mm |
| October | 32°C | 16°C | 24.1°C | 4 mm |
| November | 25°C | 10°C | 17.2°C | 5 mm |
| December | 19°C | 5°C | 12.2°C | 11 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00023158; 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.
When is the best weather to visit Blythe?
Normal highs sit between 65°F and 85°F in January, February, March, November and December. Of those, November has the fewest days with rain (1).
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 USW00023158.
When is the last frost in Blythe?
In Blythe, the last spring frost (32°F) comes after January 5 in half of years and after February 18 in one year in ten; the first autumn frost comes before December 21 in half of years and before December 2 in one year in ten. A night at 32°F or colder comes at all in 80% of years here (NOAA).
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- January 51 year in 10 after February 18; 9 in 10 after December 15
- First autumn frost, half of years before
- December 211 year in 10 before December 2; 9 in 10 before January 18
NOAA puts the median frost-free season at 347 days, and the season without a hard freeze (28°F) at 365 days.
A hard freeze (28°F) comes after December 31 in half of springs and before December 30 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Blythe in zone 9b in ZIP code 92225, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Blythe's NOAA station is in zone 9b: the coldest night of a typical year reaches 30°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 USW00023158; 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 in Blythe?
In a normal year in Blythe, 179 days a year reach 90°F (122 of them 100°F or more), 3 nights fall to 32°F or colder and 18 days bring measurable precipitation.
- Days at 90°F or more
- 179a normal year
- Days at 100°F or more
- 122a normal year
- Nights at 32°F or colder
- 3a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 18a normal year
The highest temperature in this station's record (since 1948) is 124°F, on June 20, 2016; the lowest is 20°F, on January 8, 1971.
The wettest calendar year on that record is 1992, with 9.16 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00023158; records: ACIS (NOAA Regional Climate Centers), station USW00023158. Records use complete months only; a month missing more than three days is left out.
How humid and windy is Blythe, and how clear are its skies?
The summer (June-August) dew point averages 53°F. The muggiest month is August, with an average dew point of 57°F; the driest air comes in December (26°F). June is the windiest month (9.2 mph on average), and September has the most clear or nearly clear hours (95%).
| Month | Dew point | Humidity | Afternoon humidity | Wind | Clear or few clouds | Overcast |
|---|---|---|---|---|---|---|
| January | 30°F | 37% | 22% | 6.5 mph | 81% | 9% |
| February | 32°F | 35% | 20% | 7.2 mph | 79% | 9% |
| March | 31°F | 26% | 15% | 8.4 mph | 87% | 5% |
| April | 33°F | 21% | 12% | 9.0 mph | 91% | 2% |
| May | 39°F | 20% | 11% | 8.9 mph | 92% | 2% |
| June | 46°F | 20% | 12% | 9.2 mph | 93% | 1% |
| July | 56°F | 27% | 18% | 9.2 mph | 87% | 3% |
| August | 57°F | 31% | 19% | 7.8 mph | 88% | 3% |
| September | 42°F | 24% | 15% | 6.6 mph | 95% | 1% |
| October | 33°F | 27% | 17% | 6.4 mph | 91% | 3% |
| November | 26°F | 32% | 21% | 6.5 mph | 86% | 6% |
| December | 26°F | 37% | 24% | 6.2 mph | 80% | 10% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023158. Monthly averages of all hours; afternoon humidity at 3 p.m. local standard time; sky as the share of hours NOAA's observations rate clear or few clouds (a dash where NOAA publishes no sky value).
How sunny is Blythe?
Over a year 94% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Blythe, 5.9 kWh per square metre a day. June is the sunniest month (97%) and December the cloudiest (87%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 89% | 3.5 |
| February | 89% | 4.5 |
| March | 92% | 5.9 |
| April | 94% | 7.3 |
| May | 96% | 8.2 |
| June | 97% | 8.5 |
| July | 93% | 7.6 |
| August | 94% | 7.1 |
| September | 95% | 6.2 |
| October | 94% | 5.0 |
| November | 92% | 3.8 |
| December | 87% | 3.1 |
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 much heating and cooling does Blythe need?
A normal year in Blythe brings 1,011 heating degree days, 81% fewer than the median U.S. place (5,373), and 4,460 cooling degree days, 4.9 times the median (908). One month needs 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 8,958 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 290 | 1 |
| February | 173 | 12 |
| March | 71 | 90 |
| April | 14 | 229 |
| May | 1 | 477 |
| June | 0 | 726 |
| July | 0 | 930 |
| August | 0 | 921 |
| September | 0 | 690 |
| October | 7 | 331 |
| November | 116 | 54 |
| December | 340 | 1 |
| Year (annual) | 1,011 | 4,460 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00023158. 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.
Has Blythe been warmer than normal lately?
2024 averaged 75.9°F, 1.5°F above the 1991-2020 normal of 74.4°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 75.6°F | +1.2°F | 1.48 |
| 2022 | 75.2°F | +0.8°F | 3.56 |
| 2023 | 74.0°F | −0.4°F | 2.40 |
| 2024 | 75.9°F | +1.5°F | 2.44 |
Over 65 complete years from 1949 to 2025, the station's annual mean temperature rose at a fitted 4.2°F per century (+0.23°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USW00023158; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Blythe's climate compare?
Blythe is warmer than 214 of the other 218 places with their own NOAA record in California, and wetter than 5. Across the 7,247 U.S. stations with normals, its annual mean of 74.4°F is warmer than 98%.
In the Köppen classification computed from these normals, Blythe is BWh: hot desert. 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 Blythe 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.
- Mesa Verde, CA1,025 people · 2 mi SW
- Cibola, AZ213 people · 17 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.
What do Blythe's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Blythe. This page uses Blythe Airport; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Blythe station USC00040924 | 7 mi E | 268 ft | 73.4°F | 40°F | 110°F | 3.6 | 0 | January 25 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Blythe's climate
What is the coldest month in Blythe?
December, with a normal high of 66°F and a normal low of 42°F. The warmest is July (109°F by day, 82°F at night).
Does it snow in Blythe?
Rarely. NOAA publishes no 1991-2020 snowfall normal for Blythe's NOAA station; Blythe's own co-op station Blythe station records 0 inches of snow in a normal year.
What is the rainiest month in Blythe?
February, with 0.62 in of precipitation in a normal year; the driest is June with 0.01 in.
What plant hardiness zone is Blythe in?
The USDA's 2023 map puts Blythe in zone 9b in ZIP code 92225, the nearest ZIP area. By the same method at Blythe's NOAA station, the coldest night of a typical year reaches 30°F (29 years, 1991-2020): zone 9b.
How late can frost come in Blythe?
In half of years the last 32°F night comes after January 5; in one year in ten it comes after February 18. Waiting until February 18 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Blythe in OctoberThis month day by day, its records and recent years
- California climateThe statewide normals and every place in the state
- Ehrenberg, AZ14 miles from this station, 73.9°F a year
- Quartzsite, AZ28 miles from this station, 73.7°F a year
- Iron Mountain, CA43 miles from this station, 75.2°F a year
- Parker, AZ44 miles from this station, 74.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made