San Francisco Dwtn, CA Climate: Temperature & Rain by Month
Pulled from NOAA NCEI 1991–2020 normals →: climate measurements used in PlainClimate's documented score
30-year climate normals (1991-2020) from San Francisco Dwtn's primary NOAA station, SAN FRANCISCO DWTN.
The climate verdict for San Francisco Dwtn
A compact 10.7°F seasonal swing gives San Francisco Dwtn, California a steadier-than-extreme annual shape. NOAA reports an annual average of 58°F. September is the warmest month at 63°F and January the coldest at 52°F.
- 58°F
- annual average temperature (NOAA normal)
- 22.9"
- precipitation, annual total
San Francisco Dwtn: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00023272 · San Francisco Dwtn, CA 58°F mean · 22.9" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-DRY · SWING-NARROW · COMF-UNK · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-MILD 58°F
- RANK-UPPER #4,665
- PHOTO-FINISH ≈ Salinas
- PRCP-DRY 22.9"
- SWING-NARROW 11°F
- COMF-UNK Comfort n/a
- LOAD-HEAT 2,781 HDD
- STN-1 USW00023272
- BOOK-FULL 5/6 fields
Nearest mean-temperature peer: Salinas, CA (+ 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.
- San Francisco D… (this station) 58°F
- Hot Salinas, CA 58°F
- Near Watsonville Wtr…, CA 58°F
- Cold Monterey Penins…, CA 57°F
- Near Pacifica, CA 57°F
Climate Living Index · San Francisco Dwtn
San Francisco Dwtn: 78/100 · grade B
San Francisco Dwtn publishes 3 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 3 missing weights rescale to 100.
PlainClimate-derived for San Francisco Dwtn, not an official NOAA rating. Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 0 calendar days | 100/100 · A |
| Annual temperature balance | 57.7°F · 9.8° from 67.5°F | 69/100 · C |
| Precipitation balance | 22.9 in · 12.1 from 35 in | 57/100 · C |
San Francisco Dwtn · 2026-08-04 · NOAA NCEI Climate Normals · method .
San Francisco Dwtn is a temperate Köppen climate: Csb
Coldest-month mean 52.2°F and warmest-month mean 62.9°F place this station in temperate, dry-summer, warm summer climates (Csb). Class Csb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, dry-summer, warm summer.
- Köppen code
- Csb
- Group
- Temperate
- Warmest month
- 62.9°F
- Coldest month
- 52.2°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 · heating-led station
Where San Francisco Dwtn sits across the climate record
Three NOAA fields for San Francisco Dwtn's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 68th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 32nd percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 99%
- Warmest-to-coldest month gap for San Francisco Dwtn is compact versus 6,861 complete station-years.
San Francisco Dwtn's measured station temperature trend
MethodologyAcross 94 complete annual observations from 1921 to 2022, SAN FRANCISCO DWTN warmed at a fitted rate of 0.18°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- San Francisco Dwtn primary station fitted change +0.18 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 58°F (14°C) | 47°F (8°C) | 52°F (11°C) | 4.4" | 0.0 | 0.0 |
| February | 60°F (16°C) | 48°F (9°C) | 54°F (12°C) | 4.4" | 0.0 | 0.0 |
| March | 62°F (17°C) | 49°F (9°C) | 56°F (13°C) | 3.1" | 0.0 | 0.0 |
| April | 63°F (17°C) | 50°F (10°C) | 56°F (14°C) | 1.6" | 0.0 | 0.2 |
| May | 64°F (18°C) | 51°F (11°C) | 58°F (14°C) | 0.7" | 0.0 | 0.2 |
| June | 67°F (19°C) | 53°F (12°C) | 60°F (15°C) | 0.2" | 0.0 | 0.3 |
| July | 66°F (19°C) | 54°F (12°C) | 60°F (16°C) | 0.0" | 0.0 | 0.1 |
| August | 68°F (20°C) | 56°F (13°C) | 62°F (17°C) | 0.1" | 0.0 | 0.3 |
| September | 70°F (21°C) | 56°F (13°C) | 63°F (17°C) | 0.1" | 0.0 | 1.3 |
| October | 70°F (21°C) | 54°F (12°C) | 62°F (17°C) | 0.9" | 0.0 | 0.9 |
| November | 64°F (18°C) | 51°F (10°C) | 57°F (14°C) | 2.6" | 0.0 | 0.0 |
| December | 58°F (14°C) | 47°F (8°C) | 53°F (11°C) | 4.8" | 0.0 | 0.0 |
The year, day by day
The calendar barely moves in San Francisco Dwtn: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 46°F near January 1 and 71°F near September 25.
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 46°F around January 1.
Where the wet dates fall
The likeliest wet date is February 25, when 39% of years recorded at least a hundredth of an inch. The driest is August 22 at 3%. Summed across the calendar, that is about 71 wet dates a year.
The widest day
October 12 carries the biggest normal gap between afternoon and dawn, 16°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for San Francisco Dwtn.
Where San Francisco Dwtn Stands Nationally
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 16°F.
San Francisco Dwtn earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
11.2 days with precipitation
10.8 days with precipitation
10.8 days with precipitation
6.8 days with precipitation
4.0 days with precipitation
1.6 days with precipitation
0.7 days with precipitation
1.1 days with precipitation
1.2 days with precipitation
3.5 days with precipitation
7.9 days with precipitation
11.6 days with precipitation
San Francisco Dwtn's wet season runs through the cold months
December, January and February carry 59% of the year's precipitation here, while June through August contribute 1%. 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 an unusually narrow 10.7°F seasonal spread.
- Wettest month
- December, 4.8"
- Driest month
- July, 0.0"
- Wettest three months
- December, January, February (59% 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.
How San Francisco Dwtn's precipitation splits across the calendar
About 71 days a year record measurable precipitation here, carrying 22.9" between them, or roughly 0.32 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Frost Dates & Growing Season
First Fall Freeze
N/A
50% probability date
Last Spring Freeze
N/A
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
2,781
Higher = more heating needed
Cooling Degree Days
121
Higher = more cooling needed
Warmest Month
September
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside CA closest to San Francisco Dwtn 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 (58°F here).
- Follett, TX 58°F · 0.0°F off
- Wichita, KS 58°F · 0.0°F off
- Williamson, WV 58°F · 0.0°F off
- Clayton, GA 58°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (22.9" here), excluding temperature-peer places.
- Argyle, MN 22.9" · 0.0" off
- Mellette, SD 23.0" · 0.1" off
- Perryton, TX 22.8" · 0.1" off
- Matador, TX 23.0" · 0.1" off
Data-derived climate profile
How San Francisco Dwtn's climate pattern fits together
heating led · moderate · low swing
Heating is the larger measured load in San Francisco Dwtn, at 2,781 degree days versus 121 for cooling. Unlike a strongly continental record, however, its 10.7°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
A frost-free growing-season length is not available for San Francisco Dwtn. That missing field is kept separate from the observed temperature and precipitation record rather than filled from a regional estimate.
Temperature varies within a narrow 10.7°F band across the normal year. September and January mark the typical warm and cold ends of the calendar. The annual average is 58°F. Monthly rows still matter, but they refine a steady profile rather than reveal two climatic extremes.
San Francisco Dwtn's 22.9 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from San Francisco Dwtn's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for San Francisco Dwtn, not an official NOAA class or a year-ahead forecast.
Questions about San Francisco Dwtn's climate
How much rain does San Francisco Dwtn get? ▼
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Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from San Francisco Dwtn's primary station: SAN FRANCISCO DWTN (USW00023272). 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 San Francisco Dwtn; 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 San Francisco Dwtn 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.