Chiriaco Summit, CA Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Chiriaco Summit's primary NOAA station, CHIRIACO SUMMIT.
The climate verdict for Chiriaco Summit
Chiriaco Summit, California is cooling-led and dry. Its 4.6 inches of annual precipitation pairs with an annual average of 69°F. It scores 76/100 for climate comfort (good), putting it in the top third of station-mapped location scores and exceeding 69% of them.
- 69°F
- average temperature, NOAA 1991-2020 normal
- 76/100
- comfort score, above 69% of station-mapped location scores
- 4.6"
- precipitation, annual total
- 315 days
- growing season, frost-free days
Chiriaco Summit: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00041738 · Chiriaco Summit, CA 69°F mean · 4.6" precip
TEMP-MILD · RANK-WARM · PHOTO-FINISH · PRCP-ARID · SWING-MID · COMF-TOP · LOAD-COOL · STN-1 · BOOK-FULL
- TEMP-MILD 69°F
- RANK-WARM #6,449
- PHOTO-FINISH ≈ Candelaria
- PRCP-ARID 4.6"
- SWING-MID 37°F
- COMF-TOP 76/100
- LOAD-COOL 3,158 CDD
- STN-1 USC00041738
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Candelaria, TX (+ 0.1 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every CA station list.
- Hot Pinnacle Peak, AZ 70°F
- Near Candelaria, TX 70°F
- Near Amistad Dam, TX 70°F
- Chiriaco Summit (this station) 69°F
- Cold Tohono Chul, AZ 69°F
Climate Living Index · Chiriaco Summit
Chiriaco Summit: 62/100 · grade C
Chiriaco Summit publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Chiriaco Summit, not an official NOAA rating. Rankings still use Comfort Score 76/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 315 days/year | 100/100 · A |
| Annual temperature balance | 69.4°F · 1.9° from 67.5°F | 93/100 · A |
| Normal heat + freeze calendar | 139 calendar days | 53/100 · D |
| Precipitation balance | 4.6 in · 30.4 from 35 in | 0/100 · F |
Chiriaco Summit · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Chiriaco Summit's normals sit in a dry climate class: BWh
Annual precipitation falls well below the aridity threshold for this temperature regime, so the normals classify as hot desert (BWh). Class BWh is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: dry (arid or semi-arid), specifically hot desert.
- Köppen code
- BWh
- Group
- Dry (arid or semi-arid)
- Warmest month
- 88.4°F
- Coldest month
- 51.8°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · cooling-led station
Where Chiriaco Summit sits across the climate record
Three NOAA fields for Chiriaco Summit's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 6% warmest
- Among 6,861 stations, Chiriaco Summit sits in the warmer third of annual means.
- Annual precipitation
- Drier than 99%
- Chiriaco Summit's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 78%
- Warmest-to-coldest month gap for Chiriaco Summit is compact versus 6,861 complete station-years.
How Chiriaco Summit compares across U.S. station-mapped locations
Chiriaco Summit's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
76 Top 31% score exceeds 69% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). This entry sits in this band.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 66°F (19°C) | 40°F (4°C) | 53°F (12°C) | 0.8" | 2.6 | 0.0 |
| February | 67°F (20°C) | 42°F (5°C) | 55°F (13°C) | 0.9" | 2.8 | 0.1 |
| March | 75°F (24°C) | 46°F (8°C) | 60°F (16°C) | 0.5" | 0.2 | 1.5 |
| April | 83°F (28°C) | 51°F (11°C) | 67°F (19°C) | 0.2" | 0.0 | 6.2 |
| May | 89°F (32°C) | 58°F (15°C) | 74°F (23°C) | 0.1" | 0.0 | 16.0 |
| June | 99°F (37°C) | 66°F (19°C) | 82°F (28°C) | 0.0" | 0.0 | 27.4 |
| July | 103°F (39°C) | 74°F (23°C) | 88°F (31°C) | 0.3" | 0.0 | 30.9 |
| August | 102°F (39°C) | 75°F (24°C) | 88°F (31°C) | 0.3" | 0.0 | 30.3 |
| September | 96°F (36°C) | 68°F (20°C) | 82°F (28°C) | 0.5" | 0.0 | 26.7 |
| October | 86°F (30°C) | 56°F (13°C) | 71°F (22°C) | 0.2" | 0.0 | 12.2 |
| November | 74°F (24°C) | 46°F (8°C) | 60°F (16°C) | 0.3" | 0.7 | 0.8 |
| December | 64°F (18°C) | 40°F (4°C) | 52°F (11°C) | 0.6" | 3.1 | 0.0 |
The year, day by day
The year in Chiriaco Summit runs from a mild 39°F around December 20 to 103°F at the peak near July 10, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from May 19 through October 4, covering 139 dates. The broader mild season, normal highs of 70°F or more, runs March 2 to November 24.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 39°F around December 20.
The widest day
June 9 carries the biggest normal gap between afternoon and dawn, 33°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Chiriaco Summit.
Where Chiriaco Summit Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 139 days a year the normal daily high itself reaches 90°F — a count fewer than one station in ten exceeds.
Aridity defines the water calendar: about 5 inches in a normal year lands this among the driest tenth of ranked stations.
Chiriaco Summit earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
Chiriaco Summit's wet season runs through the cold months
December, January and February carry 49% of the year's precipitation here, while June through August contribute 14%. That is the cool-season-dominant pattern of the West Coast and the higher inland West, where storm tracks swing south in winter and summer turns dry; the thermometer meanwhile shows a 36.6°F seasonal spread.
- Wettest month
- February, 0.9"
- Driest month
- June, 0.0"
- Wettest three months
- February, January, December (49% of the year)
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A cool-season label means the December-February share reaches 35%. Where snow falls, the monthly figures above report liquid-equivalent precipitation, so a wet winter month is not necessarily a rainy one.
Frost Dates & Growing Season
First Fall Freeze
December 17
50% probability date
Last Spring Freeze
February 5
50% probability date
Growing Season
315 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,514
Higher = more heating needed
Cooling Degree Days
3,158
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside CA closest to Chiriaco Summit on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (69°F here).
- Galliano, LA 69°F · 0.0°F off
- Luling, TX 69°F · 0.0°F off
- Panama City, FL 69°F · 0.0°F off
- Sealy, TX 69°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (4.6" here), excluding temperature-peer places.
- Quartzsite, AZ 4.6" · 0.0" off
- Yerington, NV 4.6" · 0.0" off
- Parker, AZ 4.6" · 0.0" off
- Las Vegas, NV 4.8" · 0.2" off
Scarce-water calendar
Where Chiriaco Summit's limited precipitation lands
cooling led · dry · mid swing
Air-conditioning demand is the clearest thermal signal here. Chiriaco Summit accumulates 3,158 cooling degree days, more than twice its 1,514 heating total; the monthly table shows when that imbalance builds rather than treating it as a year-round condition.
Heat demand sits beside limited local precipitation: Chiriaco Summit receives 4.6 inches in a normal year, inside PlainClimate's dry range. Snowfall is not added to the interpretation because its annual value is missing. Month-level precipitation is the useful check on when that small annual total arrives.
July and December mark the typical warm and cold ends of the calendar in Chiriaco Summit's middle-range seasonal profile. The measured spread is 36.6°F. The annual average is 69°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Chiriaco Summit has a long frost-free window of roughly 315 days, but the dry annual profile is a separate constraint. Growing-season length says when freezes are unlikely, not whether rainfall is sufficient.
Chiriaco Summit wettest normal
February
February concentrates the scarce annual total (4.6 inches).
Chiriaco Summit driest normal
June
June is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Chiriaco Summit's climate
How dry is Chiriaco Summit? ▼
How many days above 90°F does Chiriaco Summit get? ▼
How much energy does heating and cooling require in Chiriaco Summit? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Chiriaco Summit's primary station: CHIRIACO SUMMIT (USC00041738). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Chiriaco Summit; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Chiriaco Summit comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.