Granite Bay weather in December

In December, Granite Bay sees average daytime highs of 57°F and overnight lows near 40°F, with 5.6 in of precipitation across 10.4 wet days and about 9.3 hours of daylight. It is the 12th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 59°F in the first days to 56°F by the end. The sky is clear or mostly clear about 37% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 30 min at the start of December to 9 h 18 min by month's end. Set against the rest of the year, December is Granite Bay's 10th-clearest and 7th-windiest month. For the whole year in context, see Granite Bay's year-round climate.

Daytime high: 57°; 12th warmest
Overnight low: 40°; 1st coldest
Precipitation: 5.6 in; 10.4 wet days
Daylight: 9 h 18 min; 7:22 AM – 4:40 PM
Cloud cover: 56%; 10th clearest
Wind: 5 mph; 7th windiest
Solar energy: 2.07 kWh/m²
Travel score: 4.0; out of 10

Granite Bay is census-designated place in Placer County, California, United States.

Density: 365/km²; people per km²

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

← November Granite Bay year-round climate January →Best places to visit in December

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

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

A typical December day in Granite Bay 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 63°F. Set against its neighbours, December runs about 8°F cooler than November and on par with January.

	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)	59	59	59	58	58	58	58	58	57	57	57	57	57	56	56	56	56	56	56	56	56	56	56	56	56	56	56	56	56	56	56
Avg low (°F)	41	41	41	41	41	41	41	41	41	40	40	40	40	40	40	40	40	39	39	39	39	39	39	39	39	39	39	39	39	39	39

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

How December really feels in Granite Bay

Once humidity and wind are folded in, December 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

December 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 December compares with the rest of the year at a glance. December is the 12th-warmest and 1st-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 December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 52%.

	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 (%)	53	52	52	51	50	49	49	48	47	47	46	47	47	47	47	48	48	48	48	48	49	49	49	49	49	49	49	48	48	47	46
Cloudier (%)	47	48	48	49	50	51	51	52	53	53	54	53	53	53	53	52	52	52	52	52	51	51	51	51	51	51	51	52	52	53	54

	Clearer (%)	Cloudier (%)
1	53	47
2	52	48
3	52	48
4	51	49
5	50	50
6	49	51
7	49	51
8	48	52
9	47	53
10	47	53
11	46	54
12	47	53
13	47	53
14	47	53
15	47	53
16	48	52
17	48	52
18	48	52
19	48	52
20	48	52
21	49	51
22	49	51
23	49	51
24	49	51
25	49	51
26	49	51
27	49	51
28	48	52
29	48	52
30	47	53
31	46	54

Chance of precipitation in December

Any precipitation

Granite Bay gets around 5.6 in of rain and snow over 10.4 wet days in December, the wettest month. 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 37% 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 (%)	31	32	33	34	34	35	36	36	37	37	37	37	37	36	36	35	34	33	33	32	31	31	31	30	30	30	30	30	30	31	31

	Rain chance (%)
1	31
2	32
3	33
4	34
5	34
6	35
7	36
8	36
9	37
10	37
11	37
12	37
13	37
14	36
15	36
16	35
17	34
18	33
19	33
20	32
21	31
22	31
23	31
24	30
25	30
26	30
27	30
28	30
29	30
30	31
31	31

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 99% 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	98	98	98	98	98	98	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99
Comfortable (%)	1	1	1	2	2	2	2	2	2	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	98	2
5	98	2
6	98	2
7	98	2
8	98	2
9	98	2
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	99	1
22	99	1
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1
31	99	1

Wind in December

Winds average 5 mph in December.

Across December, 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 December

DaylightNight

Daylight runs from about 9 h 30 min at the start of December to 9 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:10 AM to 7:28 AM, and sunset from 4:39 PM to 4:47 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)	9.5	9.5	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3	9.3
Sunrise (AM)	7:10	7:11	7:12	7:13	7:13	7:14	7:15	7:16	7:17	7:18	7:18	7:19	7:20	7:20	7:21	7:22	7:22	7:23	7:24	7:24	7:25	7:25	7:26	7:26	7:26	7:27	7:27	7:27	7:28	7:28	7:28
Sunset (PM)	4:39	4:39	4:39	4:39	4:38	4:38	4:38	4:38	4:39	4:39	4:39	4:39	4:39	4:39	4:40	4:40	4:40	4:40	4:41	4:41	4:42	4:42	4:43	4:43	4:44	4:44	4:45	4:45	4:46	4:47	4:47

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	9.5	7:10	4:39
2	9.5	7:11	4:39
3	9.4	7:12	4:39
4	9.4	7:13	4:39
5	9.4	7:13	4:38
6	9.4	7:14	4:38
7	9.4	7:15	4:38
8	9.4	7:16	4:38
9	9.4	7:17	4:39
10	9.4	7:18	4:39
11	9.3	7:18	4:39
12	9.3	7:19	4:39
13	9.3	7:20	4:39
14	9.3	7:20	4:39
15	9.3	7:21	4:40
16	9.3	7:22	4:40
17	9.3	7:22	4:40
18	9.3	7:23	4:40
19	9.3	7:24	4:41
20	9.3	7:24	4:41
21	9.3	7:25	4:42
22	9.3	7:25	4:42
23	9.3	7:26	4:43
24	9.3	7:26	4:43
25	9.3	7:26	4:44
26	9.3	7:27	4:44
27	9.3	7:27	4:45
28	9.3	7:27	4:45
29	9.3	7:28	4:46
30	9.3	7:28	4:47
31	9.3	7:28	4:47

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.07 kWh/m² — the year's lowest.

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 — December's 2.07 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)	2.2	2.2	2.1	2.1	2.1	2.1	2.1	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.1	2.1	2.1	2.1	2.1	2.1	2.1	2.1
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	2.2	Moderate
2	2.2	Moderate
3	2.1	Moderate
4	2.1	Moderate
5	2.1	Moderate
6	2.1	Moderate
7	2.1	Moderate
8	2.0	Moderate
9	2.0	Moderate
10	2.0	Moderate
11	2.0	Moderate
12	2.0	Moderate
13	2.0	Moderate
14	2.0	Moderate
15	2.0	Moderate
16	2.0	Moderate
17	2.0	Moderate
18	2.0	Moderate
19	2.0	Moderate
20	2.0	Moderate
21	2.0	Moderate
22	2.0	Moderate
23	2.0	Moderate
24	2.1	Moderate
25	2.1	Moderate
26	2.1	Moderate
27	2.1	Moderate
28	2.1	Moderate
29	2.1	Moderate
30	2.1	Moderate
31	2.1	Moderate

Planning a trip in December

Hazard calendar for Granite Bay

In seasonPeak

In December, Granite Bay sits inside 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.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is December a good time to visit Granite Bay?

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

4.0

Sightseeing

12th-best month of the year

0.0

Beach & pool

12th-best month of the year

December is a reasonable time to visit Granite Bay for sightseeing.

What to pack for Granite Bay in December

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

In December, Granite Bay 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 Granite Bay in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks 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 December

GoodModeratePoorUnhealthyVery unhealthy

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

Location & terrain

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.

2 miles

348 ft

trees 66%

10 miles

1,965 ft

trees 48%

50 miles

7,989 ft

trees 48%

treesgrasslandcroplandartificial surfacesbare terrainwater

← November Granite Bay year-round climate January →Best places to visit in December

December weather nearby: Rocklin 4.3 mi · Folsom 6.2 mi · Roseville 6.8 mi · Orangevale 6.8 mi · El Dorado Hills 6.8 mi · Citrus Heights 7.5 mi · Antelope 9.9 mi · Fair Oaks 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 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. 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	59	41
2	59	41
3	59	41
4	58	41
5	58	41
6	58	41
7	58	41
8	58	41
9	57	41
10	57	40
11	57	40
12	57	40
13	57	40
14	56	40
15	56	40
16	56	40
17	56	40
18	56	39
19	56	39
20	56	39
21	56	39
22	56	39
23	56	39
24	56	39
25	56	39
26	56	39
27	56	39
28	56	39
29	56	39
30	56	39
31	56	39

	Clearer (%)	Cloudier (%)
1	53	47
2	52	48
3	52	48
4	51	49
5	50	50
6	49	51
7	49	51
8	48	52
9	47	53
10	47	53
11	46	54
12	47	53
13	47	53
14	47	53
15	47	53
16	48	52
17	48	52
18	48	52
19	48	52
20	48	52
21	49	51
22	49	51
23	49	51
24	49	51
25	49	51
26	49	51
27	49	51
28	48	52
29	48	52
30	47	53
31	46	54

	Rain chance (%)
1	31
2	32
3	33
4	34
5	34
6	35
7	36
8	36
9	37
10	37
11	37
12	37
13	37
14	36
15	36
16	35
17	34
18	33
19	33
20	32
21	31
22	31
23	31
24	30
25	30
26	30
27	30
28	30
29	30
30	31
31	31

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	98	2
5	98	2
6	98	2
7	98	2
8	98	2
9	98	2
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	99	1
22	99	1
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1
31	99	1

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

	Clearer (%)	Cloudier (%)
1	53	47
2	52	48
3	52	48
4	51	49
5	50	50
6	49	51
7	49	51
8	48	52
9	47	53
10	47	53
11	46	54
12	47	53
13	47	53
14	47	53
15	47	53
16	48	52
17	48	52
18	48	52
19	48	52
20	48	52
21	49	51
22	49	51
23	49	51
24	49	51
25	49	51
26	49	51
27	49	51
28	48	52
29	48	52
30	47	53
31	46	54

	Rain chance (%)
1	31
2	32
3	33
4	34
5	34
6	35
7	36
8	36
9	37
10	37
11	37
12	37
13	37
14	36
15	36
16	35
17	34
18	33
19	33
20	32
21	31
22	31
23	31
24	30
25	30
26	30
27	30
28	30
29	30
30	31
31	31

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	98	2
5	98	2
6	98	2
7	98	2
8	98	2
9	98	2
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	99	1
22	99	1
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1
31	99	1

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

	Clearer (%)	Cloudier (%)
1	53	47
2	52	48
3	52	48
4	51	49
5	50	50
6	49	51
7	49	51
8	48	52
9	47	53
10	47	53
11	46	54
12	47	53
13	47	53
14	47	53
15	47	53
16	48	52
17	48	52
18	48	52
19	48	52
20	48	52
21	49	51
22	49	51
23	49	51
24	49	51
25	49	51
26	49	51
27	49	51
28	48	52
29	48	52
30	47	53
31	46	54

	Rain chance (%)
1	31
2	32
3	33
4	34
5	34
6	35
7	36
8	36
9	37
10	37
11	37
12	37
13	37
14	36
15	36
16	35
17	34
18	33
19	33
20	32
21	31
22	31
23	31
24	30
25	30
26	30
27	30
28	30
29	30
30	31
31	31

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	98	2
5	98	2
6	98	2
7	98	2
8	98	2
9	98	2
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	99	1
22	99	1
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1
31	99	1