Mile 91 weather in December

In December, Mile 91 sees average daytime highs of 32°C and overnight lows near 22°C, with 19 mm of rain across 5 wet days and about 11.5 hours of daylight. It is the 5th-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 31°C in the first days to 32°C by the end. The sky is clear or mostly clear about 49% of the time in December, and the air most often feels oppressive.

Daylight stretches from about 11 h 30 min at the start of December to 11 h 30 min by month's end. Set against the rest of the year, December is Mile 91's 3rd-clearest and 10th-windiest month. For the whole year in context, see Mile 91's year-round climate.

Daytime high
32°
5th warmest
Overnight low
22°
1st coldest
Rainfall
19 mm
5 wet days
Daylight
11 h 30 min
7:00 AM – 6:30 PM
Cloud cover
45%
3rd clearest
Wind
5 km/h
10th windiest
Solar energy
4.94 kWh/m²
Travel score
4.8
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 31°C in the first days to 32°C by the end.

A typical December day in Mile 91 reaches about 32°C in the afternoon and slips back to 22°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 33°C. Set against its neighbours, December runs about 1°C warmer than November and about 2°C cooler than January.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13122
23122
33122
43122
53122
63122
73122
83122
93122
103122
113122
123122
133122
143122
153122
163122
173222
183222
193222
203222
213222
223222
233222
243222
253222
263222
273222
283222
293222
303222
313322

How December really feels in Mile 91

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.

Mile 91 weather by month

How December compares with the rest of the year at a glance. December is the 5th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 22°102.811.64.0
Feb35° / 23°112.311.73.0
Mar35° / 24°337.611.92.6
Apr34° / 24°7613.512.22.8
May31° / 24°21225.512.42.7
Jun29° / 23°32128.512.52.8
Jul28° / 23°43229.812.43.1
Aug28° / 22°50729.712.33.3
Sep29° / 23°40329.2122.9
Oct30° / 23°22628.811.82.9
Nov30° / 22°8718.311.63.8
Dec32° / 22°19511.54.8

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 19% of December, with mostly cloudy or overcast conditions the remaining 33%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25842
35842
45941
56040
66139
76139
86238
96337
106436
116436
126535
136634
146733
156832
166832
176931
187030
197129
207228
217228
227327
237327
247426
257426
267327
277327
287426
297426
307426
317426

Chance of precipitation in December

Any precipitation

Mile 91 gets around 19 mm of rain over 5 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 17% and peaks near 36% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
136
234
332
430
529
627
725
824
922
1021
1120
1219
1318
1417
1516
1615
1715
1814
1913
2012
2112
2211
2310
2410
259
268
278
288
297
307
317

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 73% of days. Sticky, muggy-or-worse air turns up on roughly 95% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
100128512
200138511
300138511
400148510
50015859
60016858
70017857
80018856
90029845
1000210835
1100211834
1200213823
1300214822
1400215812
1500216802
1600218791
1700219781
1800220771
1900322741
2001323721
2101325701
2201426681
2312428650
2412530620
2512531610
2612633580
2713635550
2813736530
2923838490
3023840470
3124941440

Wind in December

Winds average 5 km/h in December.

Across December, daily wind ranges from about 4 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
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
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 h 30 min at the start of December to 11 h 30 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 6:52 AM to 7:07 AM, and sunset from 6:25 PM to 6:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.56:526:25
211.56:536:25
311.56:536:25
411.56:546:26
511.56:546:26
611.56:556:26
711.56:556:27
811.56:566:27
911.56:566:27
1011.56:576:28
1111.56:576:28
1211.56:586:29
1311.56:586:29
1411.56:596:29
1511.56:596:30
1611.57:006:30
1711.57:006:31
1811.57:016:31
1911.57:016:32
2011.57:026:32
2111.57:026:33
2211.57:036:33
2311.57:036:34
2411.57:046:34
2511.57:046:34
2611.57:046:35
2711.57:056:35
2811.57:056:36
2911.57:066:36
3011.57:066:37
3111.57:076:37

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.94 kWh/m².

For context, solar energy here swings from a low near 3.25 kWh/m² to a high of 5.77 kWh/m² in February across the year — December's 4.94 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.7Bright
44.7Bright
54.7Bright
64.7Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.1Bright
245.1Bright
255.1Bright
265.1Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in December

Hazard calendar for Mile 91

In seasonPeak

None of Mile 91's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Mile 91's monsoon runs June–September, when most of the year's rain falls.

Mile 91 sees seasonal dust haze (February–April), heaviest in February.

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

Is December a good time to visit Mile 91?

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

4.8
Sightseeing
1st-best month of the year
7.4
Beach & pool
2nd-best month of the year

December is a reasonable time to visit Mile 91 for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Mile 91 in December

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

In December, Mile 91 sees daytime highs around 32°C and nights near 22°C. Pack light clothes. Worth having: sun protection. About 5 days see rain.

light clothessun protection

UV index in Mile 91 in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mile 91 peaks around August 20 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highAug 20UV 13Dec 15UV 8
UV index (midday)Level
Jan9Very high
Feb12Extreme
Mar12Extreme
Apr10Extreme
May12Extreme
Jun12Extreme
Jul11Extreme
Aug13Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in Mile 91 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 Mile 91 is worst in April — around 202 µg/m³ PM2.5 (very unhealthy), about 19.4× the cleanest month (August, 10 µg/m³).

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

0306090120150180210JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyVery unhealthyModerateGoodModeratePoorApr 9200 µg/m³Aug 2011 µg/m³
PM2.5 (µg/m³)Level
Jan70Unhealthy
Feb77Unhealthy
Mar194Very unhealthy
Apr202Very unhealthy
May33Moderate
Jun19Moderate
Jul13Moderate
Aug10Good
Sep11Good
Oct17Moderate
Nov25Moderate
Dec50Poor
Location & terrain

Where is Mile 91?

Mile 91 sits at 8.5°N, 12.2°W, 77 m above sea level, in Sierra Leone. The nearest listed city is Njala, 34 km away.

NjalaLunsarMakeniPort LokoBumpeBoWaterlooFreetown

Topography around Mile 91

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mile 91.

Within 3 km, the terrain around Mile 91 has only modest variations in elevation — a maximum elevation change of 31 m around an average of 73 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 438 m; within 80 km, large variations in elevation — a maximum elevation change of 820 m.

The land around Mile 91 is covered by grassland (62%) within 3 km, grassland (58%) and trees (26%) within 16 km, and trees (57%) and grassland (24%) within 80 km.

3 km
31 m
16 km
438 m
80 km
820 m
treesshrubsgrasslandcroplandartificial surfacesmangroves
December weather nearby: Njala 34 km · Lunsar 43 km · Makeni 50 km · Port Loko 71 km · Bumpe 72 km · Bo 77 km · Waterloo 95 km · Freetown 112 km

Sierra Leone travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type D / G
230 V · 50 Hz
Prices
≈ 24% of US
price level, 2025
GDP per capita
$846
2025
Happiness
3.3 / 10
World Happiness, 2025
Safe drinking water
11%
of population, 2024
Homicide rate
2.2
per 100k, 2020
Road deaths
33
per 100k/yr, 2019
Income group
Low
World Bank
Religion
Muslim 77%Christian 23%

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 Mile 91 (8.466°, -12.2146°, elevation 77 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).