Altamonte Springs weather in December

In December, Altamonte Springs sees average daytime highs of 71°F and overnight lows near 53°F, with 2.0 in of rain across 5.3 wet days and about 10.2 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 73°F in the first days to 70°F by the end. The sky is clear or mostly clear about 36% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 18 min at the start of December to 10 h 12 min by month's end. Set against the rest of the year, December is Altamonte Springs's 8th-clearest and 6th-windiest month. For the whole year in context, see Altamonte Springs's year-round climate.

Daytime high
71°
11th warmest
Overnight low
53°
3rd coldest
Rainfall
2.0 in
5.3 wet days
Daylight
10 h 12 min
7:16 AM – 5:27 PM
Cloud cover
54%
8th clearest
Wind
6 mph
6th windiest
Solar energy
2.92 kWh/m²
Travel score
7.4
out of 10

Altamonte Springs is city in Seminole County, Florida, United States.

Density
1,723/km²
people per km²
Founded
1920

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 73°F in the first days to 70°F by the end.

A typical December day in Altamonte Springs reaches about 71°F in the afternoon and slips back to 53°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 61°F and 80°F. Set against its neighbours, December runs about 5°F cooler than November and about 2°F warmer than January.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
17456
27355
37355
47355
57355
67355
77355
87355
97254
107254
117254
127254
137254
147254
157153
167153
177153
187153
197153
207153
217153
227153
237152
247052
257052
267052
277052
287052
297052
307052
317052

How December really feels in Altamonte Springs

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
0
heat index over the day's high
Days feeling ≤ 32°F
0
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.

Altamonte Springs weather by month

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

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan69° / 50°2.16.410.47.1
Feb72° / 53°2.06.6117.2
Mar76° / 57°2.36.311.87.6
Apr81° / 62°2.17.112.76.9
May86° / 68°2.89.413.45.2
Jun89° / 73°5.819.913.83.3
Jul89° / 75°5.921.913.62.9
Aug89° / 75°6.522.9132.8
Sep87° / 74°5.218.412.23.7
Oct82° / 67°2.710.511.36.1
Nov76° / 59°1.35.410.67.7
Dec71° / 53°2.05.310.27.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 17% of December, with mostly cloudy or overcast conditions the remaining 48%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15941
25941
36040
46040
55941
65842
75842
85743
95743
105743
115545
125545
135446
145347
155347
165248
175149
185050
195050
205050
214951
224951
234753
244753
254753
264753
274654
284654
294753
304753
314753

Chance of precipitation in December

Any precipitation

Altamonte Springs gets around 2.0 in of rain over 5.3 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 18% and peaks near 19% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
116
216
316
416
516
616
717
817
917
1017
1117
1218
1318
1418
1518
1618
1718
1818
1918
2018
2118
2218
2318
2418
2518
2618
2719
2819
2919
3019
3118

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 47% of days. Sticky, muggy-or-worse air turns up on roughly 14% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1421724142
2431724142
3431724142
4431724141
5431725141
6431725141
7431725141
8431724141
9431824141
10431824141
11441823140
12441823140
13451822140
14461922140
15461921140
16471821130
17481820130
18491820130
19491820131
20501819121
21511719121
22511719121
23511719121
24511719121
25511719121
26511719121
27511719121
28511719121
29511719121
30521619121
31521619121

Wind in December

Winds average 6 mph in December.

Across December, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 18 min at the start of December to 10 h 12 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 7:06 AM to 7:23 AM, and sunset from 5:24 PM to 5:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.37:065:24
210.37:075:24
310.37:085:24
410.37:085:25
510.37:095:25
610.37:105:25
710.27:105:25
810.27:115:25
910.27:125:25
1010.27:125:25
1110.27:135:26
1210.27:145:26
1310.27:145:26
1410.27:155:26
1510.27:165:27
1610.27:165:27
1710.27:175:27
1810.27:175:28
1910.27:185:28
2010.27:185:29
2110.27:195:29
2210.27:195:30
2310.27:205:30
2410.27:205:31
2510.27:215:31
2610.27:215:32
2710.27:215:32
2810.27:225:33
2910.27:225:33
3010.27:225:34
3110.27:235:35

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.92 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.92 kWh/m² to a high of 6.19 kWh/m² in May across the year — December's 2.92 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.0Moderate
23.0Moderate
33.0Moderate
43.0Moderate
53.0Moderate
63.0Moderate
73.0Moderate
82.9Moderate
92.9Moderate
102.9Moderate
112.9Moderate
122.9Moderate
132.9Moderate
142.9Moderate
152.9Moderate
162.9Moderate
172.9Moderate
182.9Moderate
192.9Moderate
202.9Moderate
212.9Moderate
222.9Moderate
232.9Moderate
242.9Moderate
252.9Moderate
262.9Moderate
272.9Moderate
282.9Moderate
292.9Moderate
302.9Moderate
313.0Moderate
Planning a trip in December

Hazard calendar for Altamonte Springs

In seasonPeak

None of Altamonte Springs's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Altamonte Springs sits in the Atlantic hurricane belt; the season peaks August–October.

Altamonte Springs's rainy season runs June–September, when most of the year's rain falls.

Atlantic hurricane
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Altamonte Springs?

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

7.4
Sightseeing
3rd-best month of the year
5.1
Beach & pool
8th-best month of the year

December is one of the better times to visit Altamonte Springs for general sightseeing.

What to pack for Altamonte Springs in December

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

In December, Altamonte Springs sees daytime highs around 71°F and nights near 53°F. Little to plan around — just the basics. About 5 days see rain.

Sea temperature near Altamonte Springs in December

The nearest coast averages about 70°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 44 mi away) is warmest in September at about 82°F and coldest in February near 67°F.

It's comfortable for a long swim from Mar 15 to Jan 17 — about 10.2 months when the water holds above 68°F.

65°70°75°80°85°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan68Refreshing
Feb67Cool
Mar68Refreshing
Apr71Refreshing
May76Warm
Jun80Warm
Jul82Warm
Aug82Warm
Sep82Warm
Oct79Warm
Nov74Refreshing
Dec70Refreshing

UV index in Altamonte Springs in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Altamonte Springs peaks around July 15 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 4 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 15UV 11Dec 20UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar8Very high
Apr8Very high
May9Very high
Jun10Extreme
Jul11Extreme
Aug10Very high
Sep9Very high
Oct7High
Nov5High
Dec4Moderate

Air quality in Altamonte Springs 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 Altamonte Springs is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (December, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1019 µg/m³Dec 137 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar15Moderate
Apr13Moderate
May13Moderate
Jun19Moderate
Jul19Moderate
Aug16Moderate
Sep11Good
Oct9Good
Nov8Good
Dec7Good
Location & terrain

Where is Altamonte Springs?

Altamonte Springs sits at 28.7°N, 81.4°W, 85 ft above sea level, in United States. The nearest listed city is Maitland, 2.5 mi away.

Topography around Altamonte Springs

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

Within 2 miles, the terrain around Altamonte Springs has only modest variations in elevation — a maximum elevation change of 112 ft around an average of 92 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 190 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 322 ft.

The land around Altamonte Springs is covered by trees (51%) and artificial surfaces (35%) within 2 miles, trees (58%) and artificial surfaces (26%) within 10 miles, and trees (57%) within 50 miles.

2 miles
112 ft
10 miles
190 ft
50 miles
322 ft
treesgrasslandartificial surfacesbare terrainwaterwetland
December weather nearby: Maitland 2.5 mi · Casselberry 2.5 mi · Winter Springs 4.3 mi · Wekiwa Springs 4.3 mi · Winter Park 4.3 mi · Lake Mary 7.5 mi · Orlando 8.7 mi · Pine Hills 8.7 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 Altamonte Springs (28.6611°, -81.3656°, elevation 85 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).