San Diego Brown Fld, CA Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from San Diego Brown Fld's primary NOAA station, SAN DIEGO BROWN FLD.
The climate verdict for San Diego Brown Fld
Dryness leads the climate profile for San Diego Brown Fld, California, with 10.2 inches of precipitation a year. NOAA records an annual average of 63°F. It scores 88/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 89% of them.
- 63°F
- average temperature, NOAA 1991-2020 normal
- 88/100
- comfort score, above 89% of station-mapped location scores
- 10.2"
- annual precipitation
- 359 days
- frost-free days per growing season
San Diego Brown Fld: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00003178 · San Diego Brown Fld, CA 63°F mean · 10.2" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-ARID · SWING-NARROW · COMF-TOP · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-MILD 63°F
- RANK-UPPER #5,626
- PHOTO-FINISH ≈ Vista
- PRCP-ARID 10.2"
- SWING-NARROW 17°F
- COMF-TOP 88/100
- LOAD-HEAT 1,598 HDD
- STN-1 USW00003178
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Vista, 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 Diego Brown… (this station) 63°F
- Hot Vista, CA 63°F
- Near Camarillo, CA 63°F
- Near Carlsbad Palomar, CA 63°F
- Cold Camp Pendleton…, CA 62°F
Climate Living Index · San Diego Brown Fld
San Diego Brown Fld: 78/100 · grade B
San Diego Brown Fld publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for San Diego Brown Fld, not an official NOAA rating. Rankings still use Comfort Score 88/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 359 days/year | 100/100 · A |
| Normal heat + freeze calendar | 0 calendar days | 100/100 · A |
| Annual temperature balance | 62.6°F · 4.9° from 67.5°F | 85/100 · A |
| Precipitation balance | 10.2 in · 24.8 from 35 in | 13/100 · F |
San Diego Brown Fld · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
San Diego Brown Fld's normals sit in a dry climate class: BSk
Precipitation is low relative to temperature but above true desert thresholds: cold semi-arid steppe (BSk). Class BSk is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: dry (arid or semi-arid), specifically cold semi-arid steppe.
- Köppen code
- BSk
- Group
- Dry (arid or semi-arid)
- Warmest month
- 71.8°F
- Coldest month
- 55.3°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 Diego Brown Fld sits across the climate record
Three NOAA fields for San Diego Brown Fld's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 18% warmest
- Among 6,861 stations, San Diego Brown Fld sits in the warmer third of annual means.
- Annual precipitation
- Drier than 93%
- San Diego Brown Fld's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 98%
- Warmest-to-coldest month gap for San Diego Brown Fld is compact versus 6,861 complete station-years.
How San Diego Brown Fld compares across U.S. station-mapped locations
San Diego Brown Fld's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
88 Top 11% score exceeds 89% 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%). Below this entry.
- 80–90: 921 station-mapped locations (15%). This entry sits in this band.
- 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 | 67°F (19°C) | 44°F (7°C) | 56°F (13°C) | 1.8" | 0.4 | 0.0 |
| February | 66°F (19°C) | 45°F (7°C) | 56°F (13°C) | 2.4" | 0.1 | 0.1 |
| March | 68°F (20°C) | 47°F (8°C) | 57°F (14°C) | 1.5" | 0.0 | 0.5 |
| April | 70°F (21°C) | 50°F (10°C) | 60°F (16°C) | 0.8" | 0.0 | 0.4 |
| May | 71°F (22°C) | 54°F (12°C) | 63°F (17°C) | 0.3" | 0.0 | 0.7 |
| June | 74°F (24°C) | 58°F (14°C) | 66°F (19°C) | 0.1" | 0.0 | 0.5 |
| July | 78°F (26°C) | 62°F (16°C) | 70°F (21°C) | 0.0" | 0.0 | 0.8 |
| August | 81°F (27°C) | 63°F (17°C) | 72°F (22°C) | 0.0" | 0.0 | 2.0 |
| September | 80°F (27°C) | 61°F (16°C) | 70°F (21°C) | 0.2" | 0.0 | 3.1 |
| October | 77°F (25°C) | 55°F (13°C) | 66°F (19°C) | 0.4" | 0.0 | 3.1 |
| November | 72°F (22°C) | 49°F (9°C) | 60°F (16°C) | 0.8" | 0.0 | 1.2 |
| December | 67°F (19°C) | 44°F (7°C) | 55°F (13°C) | 1.8" | 0.2 | 0.0 |
The year, day by day
The calendar barely moves in San Diego Brown Fld: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 43°F near December 16 and 81°F near August 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 43°F around December 16.
Where the wet dates fall
The likeliest wet date is February 28, when 28% of years recorded at least a hundredth of an inch. The driest is August 15 at 3%. Summed across the calendar, that is about 52 wet dates a year.
The widest day
November 8 carries the biggest normal gap between afternoon and dawn, 23°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for San Diego Brown Fld.
Where San Diego Brown Fld Stands Nationally
Aridity defines the water calendar: about 10 inches in a normal year lands this among the driest tenth of ranked stations.
San Diego Brown Fld 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
6.6 days with precipitation
7.5 days with precipitation
7.2 days with precipitation
6.0 days with precipitation
3.2 days with precipitation
1.4 days with precipitation
1.3 days with precipitation
0.9 days with precipitation
2.0 days with precipitation
3.5 days with precipitation
5.1 days with precipitation
6.9 days with precipitation
San Diego Brown Fld'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 16.5°F seasonal spread.
- Wettest month
- February, 2.4"
- Driest month
- August, 0.0"
- Wettest three months
- February, January, December (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.
San Diego Brown Fld is dry, and what does fall arrives gently
Only about 52 days a year record measurable precipitation here, 14% of the calendar, and they carry 10.2" between them. At roughly 0.20 inches on an average wet day, this is not the damp drizzle of a marine climate; it is an arid record in which precipitation is both uncommon and light when it appears.
The wettest month by count is February at about 8 wet days; the driest is August at about 1.
A low per-event average in a dry record is a statement about typical days only. Arid regions can still take a large share of a year's total from a single convective storm, which a normal cannot show.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, not the extremes within it.
Frost Dates & Growing Season
First Fall Freeze
December 31
50% probability date
Last Spring Freeze
January 6
50% probability date
Growing Season
359 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,598
Higher = more heating needed
Cooling Degree Days
734
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside CA closest to San Diego Brown Fld 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 (63°F here).
- Athens, AL 63°F · 0.0°F off
- Benton, AR 63°F · 0.0°F off
- Bishopville, SC 63°F · 0.0°F off
- Magnolia, AR 63°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (10.2" here), excluding temperature-peer places.
- Milford, UT 10.2" · 0.0" off
- Orovada, NV 10.2" · 0.0" off
- Las Cruces, NM 10.3" · 0.0" off
- Fort Thomas, AZ 10.2" · 0.0" off
Scarce-water calendar
Where San Diego Brown Fld's limited precipitation lands
heating led · dry · low swing
Heating is the larger measured load in San Diego Brown Fld, at 1,598 degree days versus 734 for cooling. Unlike a strongly continental record, however, its 16.5°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
San Diego Brown Fld has a long frost-free window of roughly 359 days, but the dry annual profile is a separate constraint. Growing-season length says when freezes are unlikely, not whether rainfall is sufficient.
The calendar stays thermally compact and dry. August and December mark the typical warm and cold ends of the calendar, only 16.5°F apart, while the annual precipitation total remains below PlainClimate's dry threshold. The annual average is 63°F. The monthly rows show whether that limited precipitation is spread through the year or concentrated in a shorter interval.
San Diego Brown Fld's cold-season load does not imply a wet climate. Annual precipitation is 10.2 inches, which places the station in PlainClimate's dry range. Snowfall is not added to the interpretation because its annual value is missing. The snowfall and rainfall fields should be read separately rather than inferred from temperature.
San Diego Brown Fld wettest normal
February
February concentrates the scarce annual total (10.2 inches).
San Diego Brown Fld driest normal
August
August is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about San Diego Brown Fld's climate
How dry is San Diego Brown Fld? ▼
How much energy does heating and cooling require in San Diego Brown Fld? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from San Diego Brown Fld's primary station: SAN DIEGO BROWN FLD (USW00003178). 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 Diego Brown Fld; 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 Diego Brown Fld 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.