Granite Bay in Winter
In winter (December, January and February), Granite Bay sees average daytime highs around 58°F and overnight lows near 41°F, with 16.5 in of precipitation over about 30 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 58°F. The sky is clear or mostly clear about 35% of the time across winter, and the air most often feels dry.
Winter is Granite Bay's weakest season of the year to visit on our travel score. For the whole year in context, see Granite Bay's year-round climate.
- Avg daytime high
- 58°F
- coldest season of the year
- Avg overnight low
- 41°F
- Precipitation
- 16.5 in
- 30 wet days
- Avg wind
- 5 mph
- Travel score
- 4.4
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Granite Bay in Winter
Across winter, daytime highs hold fairly steady around 58°F.
A typical winter day in Granite Bay reaches about 58°F and drops to 41°F overnight. The warmest of the three months is February, the coolest December.
How winter really feels in Granite Bay
Once humidity and wind are folded in, winter brings about 0 days that feel above 90°F and 0 that feel at or below 32°F.
winter sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Granite Bay 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° / 40° | 5.6 | 10.1 | 9.6 | 4.1 |
| Feb | 61° / 43° | 5.3 | 9.7 | 10.5 | 5.1 |
| Mar | 66° / 46° | 4.7 | 9.6 | 11.7 | 6.2 |
| Apr | 72° / 49° | 2.2 | 6.4 | 13 | 7.4 |
| May | 80° / 55° | 1.3 | 4.5 | 14.1 | 7.7 |
| Jun | 88° / 60° | 0.3 | 1.2 | 14.7 | 5.7 |
| Jul | 93° / 63° | 0.0 | 0.1 | 14.4 | 4.3 |
| Aug | 92° / 62° | 0.0 | 0.1 | 13.5 | 4.6 |
| Sep | 88° / 59° | 0.2 | 0.8 | 12.3 | 6.1 |
| Oct | 78° / 52° | 1.6 | 3.3 | 11 | 8.3 |
| Nov | 65° / 44° | 3.0 | 6.9 | 9.9 | 6.4 |
| Dec | 57° / 40° | 5.6 | 10.4 | 9.3 | 4.0 |
Cloud cover in Winter
The sky is clear or mostly clear about 35% of the time across winter.
Chance of precipitation in Winter
Granite Bay gets around 16.5 in of rain and snow over 30 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 30 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 2.5 kWh/m².
Hazard calendar for Granite Bay
In winter, Granite Bay overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Granite Bay's rainy season runs November–March, when most of the year's rain falls.
Is winter a good time to visit Granite Bay?
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 Granite Bay for sightseeing.
What to pack for Granite Bay in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Granite Bay sees daytime highs around 58°F and nights near 41°F. Worth packing: a warm layer and rain gear. About 30 days see rain.
UV index in Granite Bay in Winter
Clear-sky midday UV across winter averages around 2. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Granite Bay peaks around June 21 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 2 (low).
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 | 3 | 4 | 6 | 8 | 10 | 10 | 9 | 6 | 5 | 2 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 3 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 10 | Very high |
| Jul | 10 | Very high |
| Aug | 9 | Very high |
| Sep | 6 | High |
| Oct | 5 | Moderate |
| Nov | 2 | Low |
| Dec | 2 | Low |
Air quality in Granite Bay 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 Granite Bay is worst in September — around 41 µg/m³ PM2.5 (poor), about 3.8× the cleanest month (June, 11 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) | 13 | 15 | 18 | 15 | 11 | 11 | 21 | 37 | 41 | 21 | 31 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Good | Moderate | Poor | Poor | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 15 | Moderate |
| Mar | 18 | Moderate |
| Apr | 15 | Moderate |
| May | 11 | Good |
| Jun | 11 | Good |
| Jul | 21 | Moderate |
| Aug | 37 | Poor |
| Sep | 41 | Poor |
| Oct | 21 | Moderate |
| Nov | 31 | Moderate |
| Dec | 13 | Moderate |
Where is Granite Bay?
Granite Bay sits at 38.8°N, 121.2°W, 427 ft above sea level, in United States. The nearest listed city is Rocklin, 4.3 mi away.
Topography around Granite Bay
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Granite Bay.
Within 2 miles, the terrain around Granite Bay has only modest variations in elevation — a maximum elevation change of 348 ft around an average of 436 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,965 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 7,989 ft.
The land around Granite Bay is covered by trees (66%) within 2 miles, trees (48%), grassland (23%) and artificial surfaces (23%) within 10 miles, and trees (48%) and grassland (25%) 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 Granite Bay (38.7632°, -121.1638°, elevation 427 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.