Geiro weather in December

In December, Geiro sees average daytime highs of 26°C and overnight lows near 18°C, with 160 mm of rain across 18.9 wet days and about 12.4 hours of daylight. It is the 2nd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 21% of the time in December, and the air most often feels humid.

Daylight stretches from about 12 h 18 min at the start of December to 12 h 24 min by month's end. Set against the rest of the year, December is Geiro's 8th-clearest and 9th-windiest month. For the whole year in context, see Geiro's year-round climate.

Daytime high
26°
2nd warmest
Overnight low
18°
11th coldest
Rainfall
160 mm
18.9 wet days
Daylight
12 h 24 min
6:18 AM – 6:39 PM
Cloud cover
64%
8th clearest
Wind
8 km/h
9th windiest
Solar energy
6.04 kWh/m²
Travel score
5.3
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 26°C through the month.

A typical December day in Geiro reaches about 26°C in the afternoon and slips back to 18°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 28°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)
12717
22717
32717
42717
52717
62717
72717
82717
92717
102617
112617
122618
132618
142618
152618
162618
172618
182618
192618
202618
212618
222618
232618
242618
252618
262618
272618
282618
292618
302618
312618

Geiro weather by month

How December compares with the rest of the year at a glance. December is the 2nd-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 18°19920.812.35.0
Feb26° / 17°16316.812.25.2
Mar26° / 18°16922.5124.8
Apr24° / 17°11623.711.94.6
May23° / 16°5715.811.76.0
Jun22° / 14°176.711.77.2
Jul22° / 13°124.711.77.4
Aug23° / 13°166.211.87.4
Sep24° / 14°113.9128.0
Oct26° / 15°267.712.17.3
Nov26° / 17°6612.412.36.3
Dec26° / 18°16018.912.45.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 24% of December, with mostly cloudy or overcast conditions the remaining 55%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25545
35545
45446
55446
65347
75347
85347
95248
105149
115050
124951
134852
144654
154654
164456
174357
184159
194159
204159
213961
223961
233961
243763
253763
263664
273664
283664
293763
303763
313664

Chance of precipitation in December

Any precipitation

Geiro gets around 160 mm of rain over 18.9 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 61% and peaks near 68% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
149
250
351
452
552
653
754
855
956
1057
1158
1259
1360
1461
1562
1663
1764
1865
1966
2066
2166
2267
2367
2467
2567
2668
2768
2868
2968
3068
3168

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the humid band about 76% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1227683
2226693
3225694
4124714
5123724
6123724
7122734
8121735
9120745
10119755
11118756
12117766
13016786
14016777
15015787
16014788
17014788
18014788
19013798
20013789
21013789
22012799
23012799
24011809
25011809
260117910
270117910
280108010
290107911
300107911
310107911

Wind in December

Winds average 8 km/h in December.

Across December, daily wind ranges from about 7 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 12 h 18 min at the start of December to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 6 minutes over December. Sunrise moves from 6:12 AM to 6:25 AM, and sunset from 6:32 PM to 6:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:126:32
212.36:136:33
312.36:136:33
412.36:136:34
512.36:146:34
612.36:146:35
712.36:146:35
812.36:156:35
912.36:156:36
1012.36:166:36
1112.36:166:37
1212.46:166:37
1312.46:176:38
1412.46:176:38
1512.46:186:39
1612.46:186:39
1712.46:186:40
1812.46:196:40
1912.46:196:41
2012.46:206:41
2112.46:206:42
2212.46:216:42
2312.46:216:43
2412.46:226:43
2512.46:226:44
2612.46:236:44
2712.46:236:45
2812.46:246:45
2912.46:246:45
3012.46:256:46
3112.46:256:46

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 6.04 kWh/m².

For context, solar energy here swings from a low near 4.93 kWh/m² to a high of 6.66 kWh/m² in October across the year — December's 6.04 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.3Intense
46.3Intense
56.2Intense
66.2Intense
76.2Intense
86.2Intense
96.2Intense
106.1Intense
116.1Intense
126.1Intense
136.1Intense
146.0Intense
156.0Intense
166.0Intense
176.0Bright
186.0Bright
196.0Bright
206.0Bright
215.9Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
275.9Bright
285.9Bright
295.9Bright
305.9Bright
315.9Bright
Planning a trip in December

Hazard calendar for Geiro

In seasonPeak

In December, Geiro sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Geiro's monsoon runs December–April, 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 Geiro?

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

5.3
Sightseeing
8th-best month of the year
5.2
Beach & pool
5th-best month of the year

December is a reasonable time to visit Geiro for sightseeing.

What to pack for Geiro in December

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

In December, Geiro sees daytime highs around 26°C and nights near 18°C. Pack rain gear and sun protection. Worth having: light clothes. About 19 days see rain.

rain gearsun protectionlight clothes

UV index in Geiro in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Geiro peaks around March 11 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 17 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 11UV 16Jun 17UV 10
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar16Extreme
Apr15Extreme
May11Extreme
Jun10Extreme
Jul11Extreme
Aug11Extreme
Sep14Extreme
Oct14Extreme
Nov13Extreme
Dec13Extreme
Location & terrain

Where is Geiro?

Geiro sits at 6.2°S, 36.9°E, 1,284 m above sea level, in Tanzania. The nearest listed city is Kibaigwa, 26 km away.

KilosaKibakwe

Topography around Geiro

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

Within 3 km, the terrain around Geiro has significant variations in elevation — a maximum elevation change of 458 m around an average of 1,295 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 845 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,016 m.

The land around Geiro is covered by cropland (69%) within 3 km, cropland (71%) within 16 km, and cropland (36%), trees (26%) and shrubs (25%) within 80 km.

3 km
458 m
16 km
845 m
80 km
2,016 m
treesshrubsgrasslandcroplandartificial surfaces
December weather nearby: Kibaigwa 26 km · Mpwapwa 48 km · Msowero 56 km · Dumila 59 km · Magole 61 km · Lubata 65 km · Kilosa 77 km · Kibakwe 84 km

Tanzania travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type D / G
230 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$1,319
2025
Happiness
3.9 / 10
World Happiness, 2025
Safe drinking water
31%
of population, 2024
Homicide rate
3.7
per 100k, 2020
Road deaths
31.1
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Low
EF EPI 479
Religion
Christian 63%Muslim 34%folk religion 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 Geiro (-6.15°, 36.8667°, elevation 1,284 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).