Rocklin in Winter
In winter (December, January and February), Rocklin 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 Rocklin's weakest season of the year to visit on our travel score. For the whole year in context, see Rocklin'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 Rocklin in Winter
Across winter, daytime highs hold fairly steady around 58°F.
A typical winter day in Rocklin 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 Rocklin
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.
Rocklin 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
Rocklin 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 Rocklin
In winter, Rocklin overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Rocklin's rainy season runs November–March, when most of the year's rain falls.
Is winter a good time to visit Rocklin?
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 Rocklin for sightseeing.
What to pack for Rocklin in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Rocklin 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 Rocklin 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 Rocklin 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 Rocklin 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 Rocklin 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 Rocklin?
Rocklin sits at 38.8°N, 121.2°W, 259 ft above sea level, in United States. The nearest listed city is Roseville, 3.7 mi away.
Topography around Rocklin
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Rocklin.
Within 2 miles, the terrain around Rocklin has only modest variations in elevation — a maximum elevation change of 377 ft around an average of 299 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,444 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,480 ft.
The land around Rocklin is covered by artificial surfaces (51%) and trees (33%) within 2 miles, trees (36%), grassland (28%) and artificial surfaces (25%) within 10 miles, and trees (46%), grassland (27%) and cropland (20%) 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 Rocklin (38.7907°, -121.2358°, elevation 259 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.