Cổ Đô weather in January

In January, Cổ Đô sees average daytime highs of 19°C and overnight lows near 14°C, with 45 mm of rain across 9.1 wet days and about 10.8 hours of daylight. It is the 12th-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 19°C through the month. The sky is clear or mostly clear about 12% of the time in January, and the air most often feels dry.

Daylight stretches from about 10 h 42 min at the start of January to 11 hours by month's end. Set against the rest of the year, January is Cổ Đô's 8th-clearest and 10th-windiest month. For the whole year in context, see Cổ Đô's year-round climate.

Daytime high
19°
12th warmest
Overnight low
14°
1st coldest
Rainfall
45 mm
9.1 wet days
Daylight
10 h 48 min
6:43 AM – 5:33 PM
Cloud cover
76%
8th clearest
Wind
5 km/h
10th windiest
Solar energy
2.16 kWh/m²
Travel score
6.0
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 19°C through the month.

A typical January day in Cổ Đô reaches about 19°C in the afternoon and slips back to 14°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 25°C. Set against its neighbours, January runs about 2°C cooler than December and about 2°C cooler than February.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12014
22014
32014
42014
52014
62014
72014
82014
92014
102014
112014
121914
131914
141914
151914
161914
171914
181914
191914
201914
211914
221914
231914
241914
251914
261914
271914
281914
291914
302014
312014

How January really feels in Cổ Đô

Once humidity and wind are folded in, January 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

January sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Cổ Đô weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan19° / 14°459.110.86.0
Feb21° / 15°348.511.36.3
Mar24° / 18°6111.611.86.3
Apr29° / 22°10312.212.55.2
May31° / 25°23017.9133.4
Jun33° / 26°23819.113.32.6
Jul33° / 26°29120.913.22.6
Aug32° / 26°35422.512.72.7
Sep31° / 25°23018.812.13.5
Oct29° / 22°11911.611.55.6
Nov25° / 19°587.5117.1
Dec21° / 15°387.610.76.8

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 11% of January, with mostly cloudy or overcast conditions the remaining 77%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13268
23169
32971
42872
52773
62773
72674
82575
92575
102476
112476
122377
132278
142179
152179
162179
172179
182179
192179
202179
212179
222179
232179
242179
252179
262179
272179
282179
292179
302278
312377

Chance of precipitation in January

Any precipitation

Cổ Đô gets around 45 mm of rain over 9.1 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 30% and peaks near 32% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
128
228
329
429
530
630
731
831
931
1032
1132
1232
1332
1432
1531
1631
1731
1831
1930
2030
2129
2229
2328
2428
2528
2628
2727
2827
2927
3027
3126

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the dry band about 45% of days. Sticky, muggy-or-worse air turns up on roughly 11% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1402328100
2402328100
3402227110
4402227110
5402226110
6412226120
7412225120
8422224120
9422223130
10422322130
11432321130
12432421130
13432420120
14442519120
15442519120
16442518120
17452618110
18452618110
19462618110
20462518100
21472518100
22472518100
23482418100
24482318100
25492218101
26492219101
27492119111
28492019111
29492019111
30482020111
31481920111

Wind in January

Winds average 5 km/h in January.

Across January, 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
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 January

DaylightNight

Daylight runs from about 10 h 42 min at the start of January to 11 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over January. Sunrise moves from 6:40 AM to 6:41 AM, and sunset from 5:23 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.76:405:23
210.76:405:24
310.76:415:25
410.76:415:25
510.76:415:26
610.86:415:26
710.86:425:27
810.86:425:28
910.86:425:28
1010.86:425:29
1110.86:425:30
1210.86:425:30
1310.86:435:31
1410.86:435:32
1510.86:435:32
1610.86:435:33
1710.86:435:34
1810.96:435:34
1910.96:435:35
2010.96:435:36
2110.96:435:36
2210.96:435:37
2310.96:435:37
2410.96:425:38
2510.96:425:39
2611.06:425:39
2711.06:425:40
2811.06:425:41
2911.06:425:41
3011.06:415:42
3111.06:415:43

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.16 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.16 kWh/m² to a high of 4.77 kWh/m² in June across the year — January's 2.16 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.4Moderate
22.3Moderate
32.3Moderate
42.3Moderate
52.3Moderate
62.2Moderate
72.2Moderate
82.2Moderate
92.2Moderate
102.2Moderate
112.2Moderate
122.1Moderate
132.1Moderate
142.1Moderate
152.1Moderate
162.1Moderate
172.1Moderate
182.1Moderate
192.1Moderate
202.1Moderate
212.2Moderate
222.2Moderate
232.2Moderate
242.2Moderate
252.2Moderate
262.2Moderate
272.2Moderate
282.3Moderate
292.3Moderate
302.3Moderate
312.3Moderate
Planning a trip in January

Hazard calendar for Cổ Đô

In seasonPeak

In January, Cổ Đô sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Cổ Đô sits in the Pacific typhoon belt; the season peaks July–October.

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

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

Is January a good time to visit Cổ Đô?

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

6.0
Sightseeing
5th-best month of the year
2.9
Beach & pool
12th-best month of the year

January is a reasonable time to visit Cổ Đô for sightseeing.

What to pack for Cổ Đô in January

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

In January, Cổ Đô sees daytime highs around 19°C and nights near 14°C. Worth packing: rain gear. About 9 days see rain.

rain gear

UV index in Cổ Đô in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cổ Đô peaks around June 20 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 20 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highHighVery highExtremeHighJun 20UV 12Nov 20UV 5
UV index (midday)Level
Jan6High
Feb7High
Mar8Very high
Apr6High
May8Very high
Jun12Extreme
Jul11Extreme
Aug11Extreme
Sep6High
Oct7Very high
Nov5High
Dec6High

Air quality in Cổ Đô in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Cổ Đô is worst in April — around 98 µg/m³ PM2.5 (unhealthy), about 3.8× the cleanest month (July, 26 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyApr 1494 µg/m³Jul 2026 µg/m³
PM2.5 (µg/m³)Level
Jan76Unhealthy
Feb71Unhealthy
Mar76Unhealthy
Apr98Unhealthy
May57Unhealthy
Jun32Moderate
Jul26Moderate
Aug28Moderate
Sep39Poor
Oct53Poor
Nov66Unhealthy
Dec77Unhealthy
Location & terrain

Where is Cổ Đô?

Cổ Đô sits at 21.3°N, 105.4°E, 17 m above sea level, in Vietnam. The nearest listed city is Việt Trì, 6.0 km away.

Topography around Cổ Đô

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

Within 3 km, the terrain around Cổ Đô has only modest variations in elevation — a maximum elevation change of 22 m around an average of 13 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 333 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,211 m.

The land around Cổ Đô is covered by cropland (39%) within 3 km, trees (42%) and cropland (33%) within 16 km, and trees (72%) within 80 km.

3 km
22 m
16 km
333 m
80 km
2,211 m
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Việt Trì 6.0 km · Phú Thọ 20 km · Sơn Tây 21 km · Ba Vì 22 km · Vĩnh Yên 25 km · Phúc Yên 36 km · Đan Phượng 37 km · Thượng Cát 43 km

Vietnam travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C / F
220 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,066
2025
Happiness
6.4 / 10
World Happiness, 2025
Safe drinking water
59%
of population, 2024
Homicide rate
1.5
per 100k, 2011
Road deaths
30.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 500
Religion
none 86%Catholic 6%Buddhist 6%Protestant 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 Cổ Đô (21.2796°, 105.364°, elevation 17 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).