Brentwood in Winter
In winter (December, January and February), Brentwood sees average daytime highs around 59°F and overnight lows near 43°F, with 10.6 in of rain over about 26 wet days across the season. It is the coldest season of the year and the wettest season of the year.
Across winter, daytime highs hold fairly steady around 59°F. The sky is clear or mostly clear about 32% of the time across winter, and the air most often feels dry.
Winter is Brentwood's weakest season of the year to visit on our travel score. For the whole year in context, see Brentwood's year-round climate.
- Avg daytime high
- 59°F
- coldest season of the year
- Avg overnight low
- 43°F
- Rainfall
- 10.6 in
- 26 wet days
- Avg wind
- 5 mph
- Travel score
- 4.6
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Brentwood in Winter
Across winter, daytime highs hold fairly steady around 59°F.
A typical winter day in Brentwood reaches about 59°F and drops to 43°F overnight. The warmest of the three months is February, the coolest January.
Brentwood weather by month
How the three winter months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 57° / 43° | 3.7 | 9 | 9.7 | 4.2 |
| Feb | 61° / 45° | 3.5 | 8.8 | 10.5 | 5.2 |
| Mar | 66° / 48° | 2.7 | 8.3 | 11.7 | 6.4 |
| Apr | 70° / 50° | 1.2 | 4.7 | 13 | 7.6 |
| May | 76° / 54° | 0.6 | 3 | 14 | 8.5 |
| Jun | 82° / 57° | 0.1 | 0.7 | 14.6 | 8.3 |
| Jul | 84° / 59° | 0.0 | 0.2 | 14.4 | 7.7 |
| Aug | 84° / 59° | 0.1 | 0.2 | 13.5 | 7.7 |
| Sep | 82° / 58° | 0.0 | 0.3 | 12.3 | 8.3 |
| Oct | 76° / 54° | 0.9 | 2.8 | 11 | 8.6 |
| Nov | 65° / 47° | 1.8 | 5.4 | 10 | 6.6 |
| Dec | 57° / 43° | 3.4 | 8.4 | 9.4 | 4.3 |
Cloud cover in Winter
The sky is clear or mostly clear about 32% of the time across winter.
Chance of precipitation in Winter
Brentwood gets around 10.6 in of rain over 26 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 5 mph across winter.
Sunrise & sunset in Winter
Daylight runs from about 9 h 36 min in early December to 11 hours by late February. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 2.6 kWh/m².
Is winter a good time to visit Brentwood?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a reasonable time to visit Brentwood for sightseeing.
What to pack for Brentwood in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Brentwood sees daytime highs around 59°F and nights near 43°F. Worth packing: a warm layer and rain gear. About 26 days see rain.
UV index in Brentwood in Winter
Clear-sky midday UV across winter averages around 3. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Brentwood peaks around June 22 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 4 | 4 | 6 | 8 | 10 | 10 | 10 | 6 | 5 | 2 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | High | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 4 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 10 | Very high |
| Jul | 10 | Very high |
| Aug | 10 | Very high |
| Sep | 6 | High |
| Oct | 5 | High |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
Air quality in Brentwood in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter falls, not just the annual average.
Air quality in Brentwood is worst in August — around 27 µg/m³ PM2.5 (moderate), about 3.6× the cleanest month (June, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 15 | 14 | 15 | 12 | 9 | 8 | 11 | 27 | 23 | 17 | 19 | 14 |
| Level | Moderate | Moderate | Moderate | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 15 | Moderate |
| Feb | 14 | Moderate |
| Mar | 15 | Moderate |
| Apr | 12 | Good |
| May | 9 | Good |
| Jun | 8 | Good |
| Jul | 11 | Good |
| Aug | 27 | Moderate |
| Sep | 23 | Moderate |
| Oct | 17 | Moderate |
| Nov | 19 | Moderate |
| Dec | 14 | Moderate |
Where is Brentwood?
Brentwood sits at 37.9°N, 121.7°W, 79 ft above sea level, in United States. The nearest listed city is Oakley, 4.3 mi away.
Topography around Brentwood
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Brentwood.
Within 2 miles, the terrain around Brentwood has only modest variations in elevation — a maximum elevation change of 125 ft around an average of 75 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,490 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,452 ft.
The land around Brentwood is covered by artificial surfaces (44%) and cropland (33%) within 2 miles, grassland (40%) and cropland (25%) within 10 miles, and grassland (35%) and trees (22%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Brentwood (37.9319°, -121.6958°, elevation 79 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.