Lethem weather in December

In December, Lethem sees average daytime highs of 31°C and overnight lows near 23°C, with 75 mm of rain across 13.6 wet days and about 11.8 hours of daylight. It is the 5th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 11% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 11 h 48 min at the start of December to 11 h 48 min by month's end. Set against the rest of the year, December is Lethem's 6th-clearest and 4th-windiest month. For the whole year in context, see Lethem's year-round climate.

Daytime high
31°
5th warmest
Overnight low
23°
8th coldest
Rainfall
75 mm
13.6 wet days
Daylight
11 h 48 min
6:01 AM – 5:50 PM
Cloud cover
68%
6th clearest
Wind
11 km/h
4th windiest
Solar energy
4.87 kWh/m²
Travel score
4.1
out of 10

Lethem is Regional Capital of Alto Tcutu-Upper Essequibo, which is controlled by Guyana and claimed by Venezuela.

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 31°C through the month.

A typical December day in Lethem reaches about 31°C in the afternoon and slips back to 23°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 32°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13123
23123
33123
43123
53123
63123
73123
83123
93123
103123
113123
123123
133123
143123
153123
163123
173123
183123
193123
203123
213123
223123
233123
243123
253023
263023
273023
283023
293023
303023
313023

How December really feels in Lethem

Once humidity and wind are folded in, December averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Lethem weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 22°469.311.84.6
Feb31° / 22°478.211.94.5
Mar32° / 23°649.3124.1
Apr31° / 23°18817.112.13.6
May29° / 22°3862712.23.2
Jun29° / 22°36728.412.23.1
Jul29° / 22°36328.912.23.2
Aug30° / 22°26125.412.13.3
Sep31° / 23°15718.8123.5
Oct32° / 23°11516.411.93.5
Nov32° / 23°11415.611.83.5
Dec31° / 23°7513.611.84.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 26% of December, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13862
23862
33664
43763
53664
63763
73763
83763
93763
103763
113763
123763
133763
143763
153763
163763
173664
183664
193763
203763
213664
223664
233664
243664
253664
263664
273763
283763
293763
303862
313862

Chance of precipitation in December

Any precipitation

Lethem gets around 75 mm of rain over 13.6 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 43% and peaks near 47% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
147
247
346
446
546
645
745
845
944
1044
1144
1244
1344
1444
1545
1645
1745
1845
1945
2045
2144
2244
2343
2443
2542
2641
2740
2839
2938
3037
3136

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 55% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)
103169
203169
313267
413267
513366
613465
713564
813564
913663
1013762
1113861
1223860
1323959
1424058
1524157
1624256
1724355
1824454
1924553
2024652
2124751
2224850
2324948
2435047
2535146
2635344
2745343
2845541
2945739
3055738
3155936

Wind in December

Winds average 11 km/h in December.

Across December, daily wind ranges from about 10 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 48 min at the start of December to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over December. Sunrise moves from 5:54 AM to 6:08 AM, and sunset from 5:44 PM to 5:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.85:545:44
211.85:555:44
311.85:555:44
411.85:565:45
511.85:565:45
611.85:575:45
711.85:575:46
811.85:575:46
911.85:585:47
1011.85:585:47
1111.85:595:47
1211.85:595:48
1311.86:005:48
1411.86:005:49
1511.86:015:49
1611.86:015:50
1711.86:025:50
1811.86:025:50
1911.86:035:51
2011.86:035:51
2111.86:045:52
2211.86:045:52
2311.86:045:53
2411.86:055:53
2511.86:055:54
2611.86:065:54
2711.86:065:55
2811.86:075:55
2911.86:075:56
3011.86:085:56
3111.86:085:57

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.87 kWh/m².

For context, solar energy here swings from a low near 3.83 kWh/m² to a high of 5.74 kWh/m² in October across the year — December's 4.87 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.8Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
314.8Bright
Planning a trip in December

Hazard calendar for Lethem

In seasonPeak

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

Lethem's monsoon runs April–August, 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 Lethem?

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

4.1
Sightseeing
3rd-best month of the year
6.0
Beach & pool
4th-best month of the year

December is a reasonable time to visit Lethem for sightseeing.

What to pack for Lethem in December

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

In December, Lethem sees daytime highs around 31°C and nights near 23°C. Pack light clothes. Worth having: rain gear and sun protection. About 14 days see rain.

light clothesrain gearsun protection

UV index in Lethem in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Lethem peaks around March 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 16 at about 11 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 21UV 15Jul 16UV 11
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar15Extreme
Apr15Extreme
May13Extreme
Jun12Extreme
Jul11Extreme
Aug12Extreme
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Lethem 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 Lethem is worst in April — around 20 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (August, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 920 µg/m³Aug 2110 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar20Moderate
Apr20Moderate
May14Moderate
Jun12Moderate
Jul11Good
Aug10Good
Sep11Good
Oct12Good
Nov12Moderate
Dec13Moderate
Location & terrain

Where is Lethem?

Lethem sits at 3.4°N, 59.8°W, 0 m above sea level, in Guyana. The nearest listed city is Boa Vista, 115 km away.

Boa VistaCantáMucajaíPacaraimaAlto AlegreSanta Elena de UairénCaracaraíRorainópolis

Topography around Lethem

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

Within 3 km, the terrain around Lethem has only modest variations in elevation — a maximum elevation change of 23 m around an average of 87 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 832 m; within 80 km, large variations in elevation — a maximum elevation change of 1,000 m.

The land around Lethem is covered by grassland (79%) within 3 km, grassland (85%) within 16 km, and grassland (68%) and trees (30%) within 80 km.

3 km
23 m
16 km
832 m
80 km
1,000 m
treesshrubsgrasslandartificial surfacesbare terrainwaterwetland
December weather nearby: Boa Vista 115 km · Cantá 123 km · Mucajaí 161 km · Pacaraima 190 km · Alto Alegre 196 km · Santa Elena de Uairén 200 km · Caracaraí 227 km · Rorainópolis 278 km

Guyana travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type A / B / D / G
240 V · 60 Hz
Prices
≈ 33% of US
price level, 2025
GDP per capita
$32,414
2025
Happiness
6.0 / 10
World Happiness, 2011
Safe drinking water
67%
of population, 2024
Homicide rate
19.1
per 100k, 2023
Road deaths
22.3
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 35%Hindu 25%other Christian 21%Roman Catholic 7%

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 Lethem (3.3726°, -59.7997°, elevation 0 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).