Den Chai weather in December

In December, Den Chai sees average daytime highs of 29°C and overnight lows near 17°C, with 14 mm of rain across 2 wet days and about 10.9 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 62% of the time in December, and the air most often feels muggy.

Daylight stretches from about 11 hours at the start of December to 10 h 54 min by month's end. Set against the rest of the year, December is Den Chai's 4th-clearest and 8th-windiest month. For the whole year in context, see Den Chai's year-round climate.

Daytime high
29°
12th warmest
Overnight low
17°
2nd coldest
Rainfall
14 mm
2 wet days
Daylight
10 h 54 min
6:48 AM – 5:44 PM
Cloud cover
35%
4th clearest
Wind
5 km/h
8th windiest
Solar energy
4.41 kWh/m²
Travel score
6.6
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical December day in Den Chai reaches about 29°C in the afternoon and slips back to 17°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 32°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13019
23019
33019
43018
53018
63018
73018
83018
93018
103018
113018
123018
132917
142917
152917
162917
172917
182917
192917
202917
212916
222916
232916
242916
252916
262916
272916
282916
292916
302916
312916

How December really feels in Den Chai

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

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

Den Chai weather by month

How December compares with the rest of the year at a glance. December is the 12th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 16°182.1116.2
Feb33° / 18°101.311.44.7
Mar35° / 21°314.111.92.9
Apr36° / 24°629.112.42.0
May34° / 25°20520.612.82.3
Jun32° / 25°23625.113.12.4
Jul31° / 25°27427.1132.5
Aug31° / 24°34128.912.62.5
Sep31° / 24°29526.612.12.6
Oct31° / 23°12615.811.63.9
Nov31° / 20°304.611.25.4
Dec29° / 17°14210.96.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 62% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 18% of December, with mostly cloudy or overcast conditions the remaining 20%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17822
27822
37723
47723
57723
67723
77723
87723
97723
107822
117822
127822
137921
148020
158020
168218
178218
188317
198317
208416
218416
228416
238416
248416
258416
268317
278317
288317
298218
308218
318020

Chance of precipitation in December

Any precipitation

Den Chai gets around 14 mm of rain over 2 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 7% and peaks near 11% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
111
211
310
410
510
69
79
88
98
107
117
126
136
145
155
164
174
184
194
204
215
225
235
245
256
266
276
287
297
308
318

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the muggy band about 36% of days. Sticky, muggy-or-worse air turns up on roughly 48% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1171944253
2282044243
3282143233
4292243222
5292442212
62102541202
72102640202
82112740192
92122839181
102122939161
113133038151
123153038141
133163037130
144173037120
154183137100
16520303690
17521303580
18622303570
19623303470
20724303460
21724303350
22725303350
23825303240
24825313240
25825313140
26825323140
27825333140
28824333140
29724343140
30723353150
31622353150

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 hours at the start of December to 10 h 54 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 6:40 AM to 6:55 AM, and sunset from 5:40 PM to 5:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.06:405:40
211.06:405:40
311.06:415:40
411.06:415:40
511.06:425:40
611.06:435:41
711.06:435:41
811.06:445:41
911.06:445:41
1010.96:455:42
1110.96:455:42
1210.96:465:42
1310.96:475:43
1410.96:475:43
1510.96:485:43
1610.96:485:44
1710.96:495:44
1810.96:495:45
1910.96:505:45
2010.96:505:45
2110.96:515:46
2210.96:515:46
2310.96:525:47
2410.96:525:47
2510.96:525:48
2610.96:535:48
2710.96:535:49
2810.96:545:49
2910.96:545:50
3010.96:555:50
3110.96:555:51

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.41 kWh/m².

For context, solar energy here swings from a low near 3.86 kWh/m² to a high of 6.24 kWh/m² in April across the year — December's 4.41 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.3Bright
114.4Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
174.5Bright
184.5Bright
194.5Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
314.5Bright
Planning a trip in December

Hazard calendar for Den Chai

In seasonPeak

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

Den Chai's monsoon runs May–September, when most of the year's rain falls.

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

Is December a good time to visit Den Chai?

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

6.6
Sightseeing
1st-best month of the year
8.6
Beach & pool
1st-best month of the year

December is a reasonable time to visit Den Chai for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Den Chai in December

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

In December, Den Chai sees daytime highs around 29°C and nights near 17°C. Pack light clothes.

light clothes

UV index in Den Chai in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Den Chai peaks around June 19 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highJun 19UV 13Dec 16UV 7
UV index (midday)Level
Jan8Very high
Feb10Very high
Mar9Very high
Apr10Extreme
May12Extreme
Jun13Extreme
Jul12Extreme
Aug13Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec7Very high

Air quality in Den Chai 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 Den Chai is worst in March — around 63 µg/m³ PM2.5 (unhealthy), about 3.1× the cleanest month (June, 21 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorModeratePoorMar 1862 µg/m³Jun 2321 µg/m³
PM2.5 (µg/m³)Level
Jan43Poor
Feb49Poor
Mar63Unhealthy
Apr53Poor
May31Moderate
Jun21Moderate
Jul21Moderate
Aug22Moderate
Sep26Moderate
Oct31Moderate
Nov33Moderate
Dec36Poor
Location & terrain

Where is Den Chai?

Den Chai sits at 18.0°N, 100.1°E, 159 m above sea level, in Thailand. The nearest listed city is Phrae, 20 km away.

ThoenSukhothaiBan Na

Topography around Den Chai

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Den Chai.

Within 3 km, the terrain around Den Chai has only modest variations in elevation — a maximum elevation change of 159 m around an average of 166 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,034 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,610 m.

The land around Den Chai is covered by trees (46%) and cropland (40%) within 3 km, trees (81%) within 16 km, and trees (76%) within 80 km.

3 km
159 m
16 km
1,034 m
80 km
1,610 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Phrae 20 km · Uttaradit 40 km · Si Satchanalai 60 km · Lampang 68 km · Sawankhalok 78 km · Thoen 98 km · Sukhothai 111 km · Ban Na 113 km

Thailand travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C
230 V · 50 Hz
Prices
≈ 31% of US
price level, 2025
GDP per capita
$8,057
2025
Happiness
6.3 / 10
World Happiness, 2025
Homicide rate
4.8
per 100k, 2011
Road deaths
32.2
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very low
EF EPI 402
Religion
Buddhist 93%Muslim 5%Christian 1%other 1%

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 Den Chai (17.9837°, 100.0522°, elevation 159 m), 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).