Tejar weather in December

In December, Tejar sees average daytime highs of 25°C and overnight lows near 18°C, with 275 mm of rain across 27.7 wet days and about 11.4 hours of daylight. It is the 10th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 22% of the time in December, and the air most often feels muggy.

Daylight stretches from about 11 h 30 min at the start of December to 11 h 24 min by month's end. Set against the rest of the year, December is Tejar's 4th-clearest and 5th-windiest month. For the whole year in context, see Tejar's year-round climate.

Daytime high
25°
10th warmest
Overnight low
18°
3rd coldest
Rainfall
275 mm
27.7 wet days
Daylight
11 h 24 min
5:50 AM – 5:16 PM
Cloud cover
61%
4th clearest
Wind
3 km/h
5th windiest
Solar energy
4.4 kWh/m²
Travel score
4.2
out of 10

Tejar is human settlement in Costa Rica.

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 25°C through the month.

A typical December day in Tejar reaches about 25°C in the afternoon and slips back to 18°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 26°C. Set against its neighbours, December runs on par with November and on par with January.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12519
22519
32519
42519
52519
62519
72518
82518
92518
102518
112518
122518
132518
142518
152518
162518
172518
182518
192518
202518
212518
222518
232518
242518
252518
262518
272518
282518
292518
302518
312518

Tejar weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 18°13622.811.55.1
Feb26° / 18°8118.111.75.5
Mar27° / 19°10321.111.95.1
Apr26° / 19°26327.512.23.9
May26° / 19°66030.912.43.3
Jun25° / 19°7203012.63.3
Jul25° / 19°7433112.53.3
Aug25° / 19°8143112.33.3
Sep25° / 19°7483012.13.3
Oct25° / 19°7503111.83.4
Nov25° / 19°54729.811.63.5
Dec25° / 18°27527.711.44.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 27% of December, with mostly cloudy or overcast conditions the remaining 51%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12872
22971
33070
43169
53169
63466
73466
83664
93664
103763
113862
124159
134357
144456
154654
164951
175149
185347
195545
205743
215941
226139
236238
246436
256436
266535
276535
286535
296535
306535
316535

Chance of precipitation in December

Any precipitation

Tejar gets around 275 mm of rain over 27.7 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 90% and peaks near 97% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202531
Rain chance (%)
197
297
396
496
596
695
795
895
994
1094
1193
1293
1392
1492
1591
1690
1789
1889
1988
2087
2187
2286
2385
2485
2584
2683
2783
2883
2982
3082
3182

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 67% of days. Sticky, muggy-or-worse air turns up on roughly 67% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)
101882
201981
302080
402080
502179
602278
702377
802476
902575
1002773
1102872
1202971
1303070
1403169
1503268
1603466
1703565
1803664
1903763
2003862
2103961
2204060
2314059
2414158
2514158
2614257
2714257
2814356
2914356
3014455
3114455

Wind in December

Winds average 3 km/h in December.

Across December, daily wind ranges from about 3 km/h on the calmest days to 3 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
13calm
23calm
33calm
43calm
53calm
63calm
73calm
83calm
93calm
103calm
113calm
123calm
133calm
143calm
153calm
163calm
173calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm
313calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 30 min at the start of December to 11 h 24 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 5:43 AM to 5:57 AM, and sunset from 5:11 PM to 5:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.55:435:11
211.55:435:11
311.55:445:11
411.55:445:12
511.55:455:12
611.55:455:12
711.55:465:13
811.45:465:13
911.45:475:13
1011.45:475:14
1111.45:485:14
1211.45:485:14
1311.45:495:15
1411.45:495:15
1511.45:505:16
1611.45:505:16
1711.45:515:17
1811.45:515:17
1911.45:525:17
2011.45:525:18
2111.45:535:18
2211.45:535:19
2311.45:535:19
2411.45:545:20
2511.45:545:20
2611.45:555:21
2711.45:555:21
2811.45:565:22
2911.45:565:22
3011.45:575:23
3111.45:575:23

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.4 kWh/m².

For context, solar energy here swings from a low near 3.78 kWh/m² to a high of 6.13 kWh/m² in March across the year — December's 4.4 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.0Bright
24.0Bright
34.0Bright
44.1Bright
54.1Bright
64.1Bright
74.1Bright
84.2Bright
94.2Bright
104.2Bright
114.2Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.4Bright
174.4Bright
184.4Bright
194.5Bright
204.5Bright
214.5Bright
224.5Bright
234.6Bright
244.6Bright
254.6Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
314.8Bright
Planning a trip in December

Hazard calendar for Tejar

In seasonPeak

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

Tejar's rainy season runs May–November, 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 Tejar?

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

4.2
Sightseeing
4th-best month of the year
3.8
Beach & pool
4th-best month of the year

December is a reasonable time to visit Tejar for sightseeing.

What to pack for Tejar in December

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

In December, Tejar sees daytime highs around 25°C and nights near 18°C. Pack rain gear. Worth having: light clothes. About 28 days see rain.

rain gearlight clothes

Sea temperature near Tejar in December

The nearest coast averages about 28°C 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 43 km away) is warmest in March at about 30°C and coldest in November near 28°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar30Tropical
Apr30Tropical
May29Tropical
Jun29Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct28Tropical
Nov28Warm
Dec28Tropical

UV index in Tejar in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tejar peaks around March 16 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highMar 16UV 14Dec 17UV 10
UV index (midday)Level
Jan11Extreme
Feb13Extreme
Mar14Extreme
Apr13Extreme
May12Extreme
Jun13Extreme
Jul11Extreme
Aug12Extreme
Sep12Extreme
Oct11Extreme
Nov11Extreme
Dec9Very high

Air quality in Tejar 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 Tejar is worst in May — around 19 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (January, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodMay 1718 µg/m³Jan 149 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar11Good
Apr17Moderate
May19Moderate
Jun17Moderate
Jul18Moderate
Aug17Moderate
Sep16Moderate
Oct14Moderate
Nov12Good
Dec10Good
Location & terrain

Where is Tejar?

Tejar sits at 9.7°N, 84.2°W, 999 m above sea level, in Costa Rica. The nearest listed city is San Rafael Abajo, 12 km away.

San Juan de DiosSan FelipeSan Rafael ArribaSan RafaelSan MiguelPatarrá

Topography around Tejar

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

Within 3 km, the terrain around Tejar has large variations in elevation — a maximum elevation change of 1,074 m around an average of 900 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,461 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,470 m.

The land around Tejar is covered by trees (54%) and grassland (46%) within 3 km, trees (77%) and grassland (22%) within 16 km, and trees (58%) and water (27%) within 80 km.

3 km
1,074 m
16 km
2,461 m
80 km
3,470 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: San Rafael Abajo 12 km · Aserrí 20 km · San Juan de Dios 22 km · San Felipe 23 km · San Rafael Arriba 23 km · San Rafael 23 km · San Miguel 24 km · Patarrá 26 km

Costa Rica travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 59% of US
price level, 2025
GDP per capita
$19,970
2025
Happiness
7.4 / 10
World Happiness, 2025
Safe drinking water
81%
of population, 2024
Homicide rate
17.7
per 100k, 2023
Road deaths
14.8
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 516
Religion
Roman Catholic 48%none 27%Evangelical and Pentecostal 20%other 3%

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 Tejar (9.743°, -84.2322°, elevation 999 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. 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).