Zachary weather in December

In December, Zachary sees average daytime highs of 62°F and overnight lows near 44°F, with 4.8 in of precipitation across 9.3 wet days and about 10.1 hours of daylight. It is the 11th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 65°F in the first days to 60°F by the end. The sky is clear or mostly clear about 34% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 12 min at the start of December to 10 hours by month's end. Set against the rest of the year, December is Zachary's 9th-clearest and 5th-windiest month. For the whole year in context, see Zachary's year-round climate.

Daytime high
62°
11th warmest
Overnight low
44°
2nd coldest
Precipitation
4.8 in
9.3 wet days
Daylight
10 hours
7:00 AM – 5:02 PM
Cloud cover
58%
9th clearest
Wind
7 mph
5th windiest
Solar energy
2.6 kWh/m²
Travel score
5.5
out of 10

Zachary is city in East Baton Rouge Parish, Louisiana, United States.

Density
265/km²
people per km²
Founded
1889

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 65°F in the first days to 60°F by the end.

A typical December day in Zachary reaches about 62°F in the afternoon and slips back to 44°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 49°F and 74°F. Set against its neighbours, December runs about 7°F cooler than November and about 2°F warmer than January.

20°40°60°80°151015202531
Avg high (°F)Avg low (°F)
16546
26545
36545
46545
56445
66445
76445
86444
96444
106344
116344
126344
136344
146244
156244
166244
176244
186244
196243
206243
216143
226143
236143
246143
256143
266143
276143
286043
296043
306043
316043

How December really feels in Zachary

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.

Zachary weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan60° / 42°5.19.610.25.0
Feb64° / 45°4.69.410.95.7
Mar71° / 51°4.810.311.86.6
Apr77° / 57°4.59.212.77.0
May84° / 65°4.09.713.55.6
Jun89° / 72°4.613.413.93.8
Jul90° / 74°4.916.613.83.2
Aug91° / 73°5.015.413.13.2
Sep87° / 69°3.89.912.24.7
Oct79° / 59°3.47.211.27.2
Nov69° / 49°3.78.110.46.9
Dec62° / 44°4.89.310.15.5

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% 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 53%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25149
35149
45149
55050
65050
74951
84951
94951
104852
114852
124951
134852
144852
154852
164753
174753
184753
194753
204654
214654
224555
234456
244555
254456
264357
274258
284258
294159
304159
314258

Chance of precipitation in December

Any precipitation

Zachary gets around 4.8 in of rain and snow over 9.3 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 31% and peaks near 33% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)
129
229
329
429
529
629
729
829
929
1029
1129
1229
1330
1430
1530
1630
1731
1831
1931
2032
2132
2232
2332
2432
2532
2633
2732
2832
2932
3032
3132

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 74% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
170111270
271101270
371101270
471101270
572101170
672101170
772101170
873101070
974101060
1074101060
1174101060
127510960
137510960
147411960
157511950
167511950
177611850
187611850
197511851
207511851
217511851
227611841
237611841
247511941
257511941
267610941
277610941
287610941
297610941
307691041
317691041

Wind in December

Winds average 7 mph in December.

Across December, daily wind ranges from about 7 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 12 min at the start of December to 10 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 6:50 AM to 7:07 AM, and sunset from 4:59 PM to 5:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.26:504:59
210.16:504:59
310.16:514:59
410.16:524:59
510.16:534:59
610.16:534:59
710.16:544:59
810.16:555:00
910.16:555:00
1010.16:565:00
1110.16:575:00
1210.06:585:00
1310.06:585:01
1410.06:595:01
1510.06:595:01
1610.07:005:02
1710.07:015:02
1810.07:015:02
1910.07:025:03
2010.07:025:03
2110.07:035:04
2210.07:035:04
2310.07:045:05
2410.07:045:05
2510.07:045:06
2610.07:055:06
2710.07:055:07
2810.07:065:07
2910.07:065:08
3010.07:065:08
3110.07:075:09

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.6 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.6 kWh/m² to a high of 6.16 kWh/m² in May across the year — December's 2.6 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.9Moderate
22.8Moderate
32.8Moderate
42.8Moderate
52.8Moderate
62.7Moderate
72.7Moderate
82.7Moderate
92.7Moderate
102.7Moderate
112.6Moderate
122.6Moderate
132.6Moderate
142.6Moderate
152.6Moderate
162.6Moderate
172.6Moderate
182.5Moderate
192.5Moderate
202.5Moderate
212.5Moderate
222.5Moderate
232.5Moderate
242.5Moderate
252.5Moderate
262.5Moderate
272.5Moderate
282.5Moderate
292.5Moderate
302.5Moderate
312.5Moderate
Planning a trip in December

Is December a good time to visit Zachary?

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

5.5
Sightseeing
7th-best month of the year
1.3
Beach & pool
11th-best month of the year

December is a reasonable time to visit Zachary for sightseeing.

What to pack for Zachary in December

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

In December, Zachary sees daytime highs around 62°F and nights near 44°F. Worth packing: a warm layer and rain gear. About 9 days see rain.

a warm layerrain gear

UV index in Zachary in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Zachary peaks around July 13 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highHighModerateJul 13UV 10Dec 20UV 3
UV index (midday)Level
Jan4Moderate
Feb6High
Mar6High
Apr10Very high
May10Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep8Very high
Oct6High
Nov5Moderate
Dec3Moderate

Air quality in Zachary 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 Zachary is worst in July — around 24 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (January, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1623 µg/m³Jan 249 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb9Good
Mar11Good
Apr11Good
May15Moderate
Jun19Moderate
Jul24Moderate
Aug18Moderate
Sep13Moderate
Oct12Good
Nov10Good
Dec9Good
Location & terrain

Where is Zachary?

Zachary sits at 30.6°N, 91.2°W, 102 ft above sea level, in United States. The nearest listed city is Central, 9.9 mi away.

Topography around Zachary

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

Within 2 miles, the terrain around Zachary has only modest variations in elevation — a maximum elevation change of 95 ft around an average of 108 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 259 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 535 ft.

The land around Zachary is covered by trees (65%) and grassland (23%) within 2 miles, trees (66%) and grassland (25%) within 10 miles, and trees (75%) within 50 miles.

2 miles
95 ft
10 miles
259 ft
50 miles
535 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Central 9.9 mi · Baton Rouge 14 mi · Shenandoah 19 mi · Prairieville 26 mi · Hammond 42 mi · Opelousas 55 mi · Laplace 57 mi · Lafayette 59 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 Zachary (30.6485°, -91.1565°, elevation 102 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).