Morgan Hill weather in December

In December, Morgan Hill sees average daytime highs of 56°F and overnight lows near 40°F, with 3.9 in of rain across 8.8 wet days and about 9.5 hours of daylight. It is the 12th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 56°F through the month. 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 36 min at the start of December to 9 h 30 min by month's end. Set against the rest of the year, December is Morgan Hill's 9th-clearest and 5th-windiest month. For the whole year in context, see Morgan Hill's year-round climate.

Daytime high
56°
12th warmest
Overnight low
40°
1st coldest
Rainfall
3.9 in
8.8 wet days
Daylight
9 h 30 min
7:19 AM – 4:47 PM
Cloud cover
55%
9th clearest
Wind
4 mph
5th windiest
Solar energy
2.36 kWh/m²
Travel score
4.0
out of 10

Morgan Hill is city in Santa Clara County, California, United States.

Density
1,287/km²
people per km²
Founded
1906

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 56°F through the month.

A typical December day in Morgan Hill reaches about 56°F in the afternoon and slips back to 40°F overnight — a 16°F spread between the day's warmth and the night's chill. On most days the high lands between 49°F and 64°F. Set against its neighbours, December runs about 7°F cooler than November and on par with January.

30°40°50°60°70°151015202531
Avg high (°F)Avg low (°F)
15841
25841
35841
45841
55841
65741
75741
85741
95740
105740
115640
125640
135640
145640
155640
165640
175640
185640
195639
205639
215539
225539
235539
245539
255539
265539
275539
285539
295539
305539
315539

Morgan Hill weather by month

How December compares with the rest of the year at a glance. December is the 12th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan56° / 40°4.49.19.74.1
Feb58° / 42°4.49.210.64.4
Mar61° / 44°3.39.211.75.4
Apr65° / 45°1.65.712.96.7
May71° / 49°0.83.4148.1
Jun77° / 53°0.20.814.59.1
Jul82° / 57°0.10.214.38.8
Aug82° / 57°0.00.313.48.8
Sep80° / 56°0.10.612.38.9
Oct73° / 51°1.02.8118.6
Nov63° / 44°1.95.7106.2
Dec56° / 40°3.98.89.54.0

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 13% of December, with mostly cloudy or overcast conditions the remaining 49%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25347
35248
45149
55050
65050
74951
85050
95050
105050
114951
124951
135050
145050
155149
165149
175149
185248
195248
205248
215248
225248
235248
245149
255149
265050
275050
285050
294951
304852
314753

Chance of precipitation in December

Any precipitation

Morgan Hill gets around 3.9 in of rain over 8.8 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 28% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
127
227
328
429
529
629
730
830
930
1030
1130
1230
1330
1430
1529
1629
1728
1828
1927
2027
2127
2227
2327
2427
2527
2627
2727
2828
2928
3028
3129

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.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
10991
11991
121000
131000
141000
151000
161000
171000
181000
191000
20991
21991
22991
23991
24991
25991
26991
27991
28991
29991
30991
31991

Wind in December

Winds average 4 mph in December.

Across December, daily wind ranges from about 4 mph on the calmest days to 4 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 36 min at the start of December to 9 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 7:07 AM to 7:25 AM, and sunset from 4:45 PM to 4:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.67:074:45
29.67:084:45
39.67:094:45
49.67:104:45
59.67:114:45
69.67:124:45
79.57:124:45
89.57:134:45
99.57:144:45
109.57:154:45
119.57:164:45
129.57:164:46
139.57:174:46
149.57:184:46
159.57:184:46
169.57:194:47
179.57:204:47
189.57:204:47
199.47:214:48
209.47:214:48
219.47:224:48
229.47:224:49
239.47:234:49
249.47:234:50
259.47:244:50
269.57:244:51
279.57:244:52
289.57:254:52
299.57:254:53
309.57:254:54
319.57:254:54

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.36 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.36 kWh/m² to a high of 7.99 kWh/m² in June across the year — December's 2.36 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.5Moderate
22.5Moderate
32.4Moderate
42.4Moderate
52.4Moderate
62.4Moderate
72.4Moderate
82.3Moderate
92.3Moderate
102.3Moderate
112.3Moderate
122.3Moderate
132.3Moderate
142.3Moderate
152.3Moderate
162.3Moderate
172.3Moderate
182.3Moderate
192.3Moderate
202.3Moderate
212.3Moderate
222.3Moderate
232.3Moderate
242.4Moderate
252.4Moderate
262.4Moderate
272.4Moderate
282.4Moderate
292.4Moderate
302.4Moderate
312.4Moderate
Planning a trip in December

Hazard calendar for Morgan Hill

In seasonPeak

In December, Morgan Hill sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Morgan Hill's rainy season runs December–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 Morgan Hill?

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
11th-best month of the year

December is a reasonable time to visit Morgan Hill for sightseeing.

What to pack for Morgan Hill in December

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

In December, Morgan Hill sees daytime highs around 56°F and nights near 40°F. Worth packing: a warm layer and rain gear. About 9 days see rain.

a warm layerrain gear

Sea temperature near Morgan Hill in December

The nearest coast averages about 55°F in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 22 mi away) is warmest in September at about 58°F and coldest in April near 54°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

52°54°56°58°60°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°F)Comfort
Jan55Bracing
Feb55Bracing
Mar55Bracing
Apr54Bracing
May54Bracing
Jun55Bracing
Jul57Bracing
Aug58Bracing
Sep58Bracing
Oct58Bracing
Nov56Bracing
Dec55Bracing

UV index in Morgan Hill 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 Morgan Hill peaks around June 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 22UV 10Dec 14UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun11Extreme
Jul10Extreme
Aug10Very high
Sep7High
Oct5High
Nov2Moderate
Dec2Moderate

Air quality in Morgan Hill 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 Morgan Hill is worst in August — around 34 µg/m³ PM2.5 (moderate), about 4.9× the cleanest month (June, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateAug 1832 µg/m³Jun 157 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar13Moderate
Apr10Good
May8Good
Jun7Good
Jul9Good
Aug34Moderate
Sep16Moderate
Oct14Moderate
Nov15Moderate
Dec12Good
Location & terrain

Where is Morgan Hill?

Morgan Hill sits at 37.1°N, 121.7°W, 354 ft above sea level, in United States. The nearest listed city is Gilroy, 9.9 mi away.

Topography around Morgan Hill

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Morgan Hill.

Within 2 miles, the terrain around Morgan Hill has significant variations in elevation — a maximum elevation change of 1,073 ft around an average of 436 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,360 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,298 ft.

The land around Morgan Hill is covered by artificial surfaces (45%), grassland (26%) and trees (20%) within 2 miles, trees (53%) and grassland (33%) within 10 miles, and grassland (37%) and trees (26%) within 50 miles.

2 miles
1,073 ft
10 miles
3,360 ft
50 miles
4,298 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Gilroy 9.9 mi · Watsonville 16 mi · Los Gatos 19 mi · Alum Rock 19 mi · Campbell 19 mi · San Jose 20 mi · Live Oak 21 mi · Saratoga 22 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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Morgan Hill (37.1305°, -121.6544°, elevation 354 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).