Rocklin weather in January

In January, Rocklin sees average daytime highs of 57°F and overnight lows near 40°F, with 5.6 in of precipitation across 10.1 wet days and about 9.6 hours of daylight. It is the 11th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 56°F in the first days to 59°F by the end. The sky is clear or mostly clear about 34% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 18 min at the start of January to 10 hours by month's end. Set against the rest of the year, January is Rocklin's 12th-clearest and 9th-windiest month. For the whole year in context, see Rocklin's year-round climate.

Daytime high: 57°; 11th warmest
Overnight low: 40°; 2nd coldest
Precipitation: 5.6 in; 10.1 wet days
Daylight: 9 h 36 min; 7:27 AM – 5:01 PM
Cloud cover: 59%; 12th clearest
Wind: 5 mph; 9th windiest
Solar energy: 2.25 kWh/m²
Travel score: 4.1; out of 10

Rocklin is city in Placer County, California, United States.

Density: 1,206/km²; people per km²
Founded: 1893

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← December Rocklin year-round climate February →Best places to visit in January

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 56°F in the first days to 59°F by the end.

A typical January day in Rocklin reaches about 57°F in the afternoon and slips back to 40°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 51°F and 64°F. Set against its neighbours, January runs on par with December and about 4°F cooler than February.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°F)	56	56	56	56	56	56	56	56	56	56	56	56	57	57	57	57	57	57	57	58	58	58	58	58	58	58	59	59	59	59	60
Avg low (°F)	39	39	39	39	39	40	40	40	40	40	40	40	40	40	40	40	40	40	41	41	41	41	41	41	41	41	41	41	41	41	42

	Avg high (°F)	Avg low (°F)
1	56	39
2	56	39
3	56	39
4	56	39
5	56	39
6	56	40
7	56	40
8	56	40
9	56	40
10	56	40
11	56	40
12	56	40
13	57	40
14	57	40
15	57	40
16	57	40
17	57	40
18	57	40
19	57	41
20	58	41
21	58	41
22	58	41
23	58	41
24	58	41
25	58	41
26	58	41
27	59	41
28	59	41
29	59	41
30	59	41
31	60	42

How January really feels in Rocklin

Once humidity and wind are folded in, January averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F

heat index over the day's high

Days feeling ≤ 32°F

wind chill below the day's low

January 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 January compares with the rest of the year at a glance. January is the 11th-warmest and 2nd-wettest month here — the current month is highlighted below.

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 January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of January, with mostly cloudy or overcast conditions the remaining 54%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	46	45	46	45	45	45	46	46	45	46	45	46	46	47	46	47	47	47	47	47	46	46	46	45	45	45	45	44	44	44	45
Cloudier (%)	54	55	54	55	55	55	54	54	55	54	55	54	54	53	54	53	53	53	53	53	54	54	54	55	55	55	55	56	56	56	55

	Clearer (%)	Cloudier (%)
1	46	54
2	45	55
3	46	54
4	45	55
5	45	55
6	45	55
7	46	54
8	46	54
9	45	55
10	46	54
11	45	55
12	46	54
13	46	54
14	47	53
15	46	54
16	47	53
17	47	53
18	47	53
19	47	53
20	47	53
21	46	54
22	46	54
23	46	54
24	45	55
25	45	55
26	45	55
27	45	55
28	44	56
29	44	56
30	44	56
31	45	55

Chance of precipitation in January

Any precipitation

Rocklin gets around 5.6 in of rain and snow over 10.1 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 33% and peaks near 34% on the wettest days, and about 0 day brings snow.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	32	32	33	33	33	33	32	32	32	32	32	32	32	33	33	33	33	34	34	34	34	34	34	34	34	33	33	33	32	32	32

	Rain chance (%)
1	32
2	32
3	33
4	33
5	33
6	33
7	32
8	32
9	32
10	32
11	32
12	32
13	32
14	33
15	33
16	33
17	33
18	34
19	34
20	34
21	34
22	34
23	34
24	34
25	34
26	33
27	33
28	33
29	32
30	32
31	32

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	99	99	99	99	99	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	99	99	99	99
Comfortable (%)	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	99	1
29	99	1
30	99	1
31	99	1

Wind in January

Winds average 5 mph in January.

Across January, daily wind ranges from about 5 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (mph)	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (mph)	Feels
1	5	calm
2	5	calm
3	5	calm
4	5	calm
5	5	calm
6	5	calm
7	5	calm
8	5	calm
9	5	calm
10	5	calm
11	5	calm
12	5	calm
13	5	calm
14	5	calm
15	5	calm
16	5	calm
17	5	calm
18	5	calm
19	5	calm
20	5	calm
21	5	calm
22	5	calm
23	5	calm
24	5	calm
25	5	calm
26	5	calm
27	5	calm
28	5	calm
29	5	calm
30	5	calm
31	5	calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 h 18 min at the start of January to 10 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over January. Sunrise moves from 7:28 AM to 7:19 AM, and sunset from 4:48 PM to 5:17 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	9.3	9.3	9.3	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.5	9.5	9.5	9.5	9.5	9.6	9.6	9.6	9.6	9.7	9.7	9.7	9.7	9.8	9.8	9.8	9.8	9.9	9.9	9.9	10.0
Sunrise (AM)	7:28	7:28	7:29	7:29	7:29	7:29	7:29	7:29	7:29	7:29	7:28	7:28	7:28	7:28	7:28	7:27	7:27	7:27	7:26	7:26	7:25	7:25	7:24	7:24	7:23	7:23	7:22	7:21	7:21	7:20	7:19
Sunset (PM)	4:48	4:49	4:49	4:50	4:51	4:52	4:53	4:54	4:54	4:55	4:56	4:57	4:58	4:59	5:00	5:01	5:02	5:03	5:04	5:05	5:06	5:07	5:08	5:10	5:11	5:12	5:13	5:14	5:15	5:16	5:17

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	9.3	7:28	4:48
2	9.3	7:28	4:49
3	9.3	7:29	4:49
4	9.4	7:29	4:50
5	9.4	7:29	4:51
6	9.4	7:29	4:52
7	9.4	7:29	4:53
8	9.4	7:29	4:54
9	9.4	7:29	4:54
10	9.4	7:29	4:55
11	9.5	7:28	4:56
12	9.5	7:28	4:57
13	9.5	7:28	4:58
14	9.5	7:28	4:59
15	9.5	7:28	5:00
16	9.6	7:27	5:01
17	9.6	7:27	5:02
18	9.6	7:27	5:03
19	9.6	7:26	5:04
20	9.7	7:26	5:05
21	9.7	7:25	5:06
22	9.7	7:25	5:07
23	9.7	7:24	5:08
24	9.8	7:24	5:10
25	9.8	7:23	5:11
26	9.8	7:23	5:12
27	9.8	7:22	5:13
28	9.9	7:21	5:14
29	9.9	7:21	5:15
30	9.9	7:20	5:16
31	10.0	7:19	5:17

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.25 kWh/m².

For context, solar energy here swings from a low near 2.07 kWh/m² to a high of 8.22 kWh/m² in July across the year — January's 2.25 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	2.1	2.1	2.1	2.1	2.1	2.1	2.1	2.1	2.1	2.1	2.1	2.2	2.2	2.2	2.2	2.2	2.3	2.3	2.3	2.3	2.4	2.4	2.4	2.4	2.5	2.5	2.5	2.6	2.6	2.6	2.7
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	2.1	Moderate
2	2.1	Moderate
3	2.1	Moderate
4	2.1	Moderate
5	2.1	Moderate
6	2.1	Moderate
7	2.1	Moderate
8	2.1	Moderate
9	2.1	Moderate
10	2.1	Moderate
11	2.1	Moderate
12	2.2	Moderate
13	2.2	Moderate
14	2.2	Moderate
15	2.2	Moderate
16	2.2	Moderate
17	2.3	Moderate
18	2.3	Moderate
19	2.3	Moderate
20	2.3	Moderate
21	2.4	Moderate
22	2.4	Moderate
23	2.4	Moderate
24	2.4	Moderate
25	2.5	Moderate
26	2.5	Moderate
27	2.5	Moderate
28	2.6	Moderate
29	2.6	Moderate
30	2.6	Moderate
31	2.7	Moderate

Planning a trip in January

Hazard calendar for Rocklin

In seasonPeak

In January, Rocklin sits inside 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.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is January a good time to visit Rocklin?

Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.1

Sightseeing

11th-best month of the year

0.0

Beach & pool

11th-best month of the year

January is a reasonable time to visit Rocklin for sightseeing.

What to pack for Rocklin in January

From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In January, Rocklin sees daytime highs around 57°F and nights near 40°F. Worth packing: a warm layer and rain gear. About 10 days see rain.

a warm layerrain gear

UV index in Rocklin in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks 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 January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January 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

Location & terrain

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.

2 miles

377 ft

artificial surfaces 51%

10 miles

1,444 ft

trees 36%

50 miles

7,480 ft

trees 46%

treesgrasslandcroplandartificial surfacesbare terrainwater

← December Rocklin year-round climate February →Best places to visit in January

January weather nearby: Roseville 3.7 mi · Granite Bay 4.3 mi · Citrus Heights 6.2 mi · Lincoln 7.5 mi · Antelope 7.5 mi · Orangevale 8.1 mi · Folsom 8.7 mi · Foothill Farms 9.9 mi

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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°F)	Avg low (°F)
1	56	39
2	56	39
3	56	39
4	56	39
5	56	39
6	56	40
7	56	40
8	56	40
9	56	40
10	56	40
11	56	40
12	56	40
13	57	40
14	57	40
15	57	40
16	57	40
17	57	40
18	57	40
19	57	41
20	58	41
21	58	41
22	58	41
23	58	41
24	58	41
25	58	41
26	58	41
27	59	41
28	59	41
29	59	41
30	59	41
31	60	42

	Clearer (%)	Cloudier (%)
1	46	54
2	45	55
3	46	54
4	45	55
5	45	55
6	45	55
7	46	54
8	46	54
9	45	55
10	46	54
11	45	55
12	46	54
13	46	54
14	47	53
15	46	54
16	47	53
17	47	53
18	47	53
19	47	53
20	47	53
21	46	54
22	46	54
23	46	54
24	45	55
25	45	55
26	45	55
27	45	55
28	44	56
29	44	56
30	44	56
31	45	55

	Rain chance (%)
1	32
2	32
3	33
4	33
5	33
6	33
7	32
8	32
9	32
10	32
11	32
12	32
13	32
14	33
15	33
16	33
17	33
18	34
19	34
20	34
21	34
22	34
23	34
24	34
25	34
26	33
27	33
28	33
29	32
30	32
31	32

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	99	1
29	99	1
30	99	1
31	99	1

	Avg high (°F)	Avg low (°F)
1	56	39
2	56	39
3	56	39
4	56	39
5	56	39
6	56	40
7	56	40
8	56	40
9	56	40
10	56	40
11	56	40
12	56	40
13	57	40
14	57	40
15	57	40
16	57	40
17	57	40
18	57	40
19	57	41
20	58	41
21	58	41
22	58	41
23	58	41
24	58	41
25	58	41
26	58	41
27	59	41
28	59	41
29	59	41
30	59	41
31	60	42

	Clearer (%)	Cloudier (%)
1	46	54
2	45	55
3	46	54
4	45	55
5	45	55
6	45	55
7	46	54
8	46	54
9	45	55
10	46	54
11	45	55
12	46	54
13	46	54
14	47	53
15	46	54
16	47	53
17	47	53
18	47	53
19	47	53
20	47	53
21	46	54
22	46	54
23	46	54
24	45	55
25	45	55
26	45	55
27	45	55
28	44	56
29	44	56
30	44	56
31	45	55

	Rain chance (%)
1	32
2	32
3	33
4	33
5	33
6	33
7	32
8	32
9	32
10	32
11	32
12	32
13	32
14	33
15	33
16	33
17	33
18	34
19	34
20	34
21	34
22	34
23	34
24	34
25	34
26	33
27	33
28	33
29	32
30	32
31	32

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	99	1
29	99	1
30	99	1
31	99	1

	Avg high (°F)	Avg low (°F)
1	56	39
2	56	39
3	56	39
4	56	39
5	56	39
6	56	40
7	56	40
8	56	40
9	56	40
10	56	40
11	56	40
12	56	40
13	57	40
14	57	40
15	57	40
16	57	40
17	57	40
18	57	40
19	57	41
20	58	41
21	58	41
22	58	41
23	58	41
24	58	41
25	58	41
26	58	41
27	59	41
28	59	41
29	59	41
30	59	41
31	60	42

	Clearer (%)	Cloudier (%)
1	46	54
2	45	55
3	46	54
4	45	55
5	45	55
6	45	55
7	46	54
8	46	54
9	45	55
10	46	54
11	45	55
12	46	54
13	46	54
14	47	53
15	46	54
16	47	53
17	47	53
18	47	53
19	47	53
20	47	53
21	46	54
22	46	54
23	46	54
24	45	55
25	45	55
26	45	55
27	45	55
28	44	56
29	44	56
30	44	56
31	45	55

	Rain chance (%)
1	32
2	32
3	33
4	33
5	33
6	33
7	32
8	32
9	32
10	32
11	32
12	32
13	32
14	33
15	33
16	33
17	33
18	34
19	34
20	34
21	34
22	34
23	34
24	34
25	34
26	33
27	33
28	33
29	32
30	32
31	32

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	99	1
29	99	1
30	99	1
31	99	1