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December Weather in Hanoi Vietnam

Daily high temperatures decrease by 5°F, from 74°F to 69°F, rarely falling below 59°F or exceeding 82°F.

Daily low temperatures decrease by 5°F, from 62°F to 58°F, rarely falling below 49°F or exceeding 71°F.

For reference, on June 26, the hottest day of the year, temperatures in Hanoi typically range from 80°F to 92°F, while on January 19, the coldest day of the year, they range from 57°F to 67°F.

Average High and Low Temperature in December in Hanoi

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in December in Hanoi

Average Hourly Temperature in December in HanoiDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJanNowNowcoolcoolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Laguna Heights, Texas, United States (8,843 miles away) and St. Petersburg, Florida, United States (9,028 miles) are the far-away foreign places with temperatures most similar to Hanoi (view comparison).

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The month of December in Hanoi experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 33% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 32% on December 18.

The clearest day of the month is December 18, with clear, mostly clear, or partly cloudy conditions 68% of the time.

For reference, on June 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 93%, while on February 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%.

Cloud Cover Categories in December in Hanoi

Cloud Cover Categories in December in HanoiDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanJun 157%Jun 157%Dec 166%Dec 166%Dec 3168%Dec 3168%Dec 1168%Dec 1168%Dec 2168%Dec 2168%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Hanoi, the chance of a wet day over the course of December is essentially constant, remaining around 7% throughout.

For reference, the year's highest daily chance of a wet day is 57% on August 24, and its lowest chance is 5% on January 31.

Probability of Precipitation in December in Hanoi

Probability of Precipitation in December in HanoiDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%2%2%4%4%6%6%8%8%10%10%12%12%14%14%16%16%18%18%20%20%22%22%NovJanDec 18%Dec 18%Dec 317%Dec 317%Dec 117%Dec 117%Dec 216%Dec 216%NowNowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during December in Hanoi is gradually decreasing, starting the month at 0.8 inches, when it rarely exceeds 2.2 inches, and ending the month at 0.6 inches, when it rarely exceeds 1.4 inches.

Average Monthly Rainfall in December in Hanoi

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of December in Hanoi, the length of the day is essentially constant. The shortest day of the month is December 21, with 10 hours, 51 minutes of daylight and the longest day is December 1, with 10 hours, 57 minutes of daylight.

Hours of Daylight and Twilight in December in Hanoi

Hours of Daylight and Twilight in December in HanoiDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 2110 hr, 51 minDec 2110 hr, 51 minnightnightdaydayDec 110 hr, 57 minDec 110 hr, 57 minNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month in Hanoi is 6:17 AM on December 1 and the latest sunrise is 16 minutes later at 6:33 AM on December 31.

The earliest sunset is 5:14 PM on December 1 and the latest sunset is 12 minutes later at 5:26 PM on December 31.

Daylight saving time is not observed in Hanoi during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:15 AM and sets 13 hours, 25 minutes later, at 6:40 PM, while on December 21, the shortest day of the year, it rises at 6:29 AM and sets 10 hours, 51 minutes later, at 5:20 PM.

Sunrise & Sunset with Twilight in December in Hanoi

The solar day over the course of December. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in December in Hanoi

Solar Elevation and Azimuth in December in HanoiDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJan001010202020303040405050000101020203030304040NowNow
northeastsouthwest
Solar elevation and azimuth over the course of December 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for December 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in December in Hanoi

Moon Rise, Set & Phases in December in HanoiDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanNov 17:48 PMNov 17:48 PMNov 164:29 AMNov 164:29 AMDec 11:22 PMDec 11:22 PMDec 154:02 PMDec 154:02 PMDec 315:28 AMDec 315:28 AMJan 145:28 AMJan 145:28 AMJan 297:37 PMJan 297:37 PM5:34 AM5:34 AM5:04 PM5:04 PM4:37 PM4:37 PM6:18 AM6:18 AM6:10 AM6:10 AM5:05 PM5:05 PM5:05 PM5:05 PM7:17 AM7:17 AM6:51 AM6:51 AM5:43 PM5:43 PM4:54 PM4:54 PM6:54 AM6:54 AM6:23 AM6:23 AM5:34 PM5:34 PMNowNow
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Dec 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
0%6:10 AMESE5:05 PMWSW-11:37 AMS246,377 mi
2
1%7:07 AMESE5:57 PMWSW-12:32 PMS244,343 mi
3
4%8:04 AMESE6:53 PMWSW-1:29 PMS242,229 mi
4
10%8:59 AMESE7:53 PMWSW-2:26 PMS240,086 mi
5
17%9:49 AMESE8:54 PMWSW-3:22 PMS237,941 mi
6
26%10:34 AMESE9:55 PMWSW-4:15 PMS235,810 mi
7
37%11:15 AMESE10:54 PMWSW-5:05 PMS233,717 mi
8
50%11:53 AME11:53 PMW-5:53 PMS231,715 mi
9
60%12:30 PME--6:39 PMS229,897 mi
10
71%-12:51 AMW1:06 PME7:27 PMS228,398 mi
11
81%-1:50 AMW1:45 PMENE8:16 PMS227,383 mi
12
90%-2:52 AMWNW2:26 PMENE9:09 PMS227,027 mi
13
96%-3:57 AMWNW3:13 PMENE10:06 PMN227,470 mi
14
99%-5:05 AMWNW4:06 PMENE11:08 PMN228,785 mi
15
100%-6:12 AMWNW5:05 PMENE--
16
100%-7:17 AMWNW6:08 PMENE12:11 AMN230,937 mi
17
98%-8:15 AMWNW7:12 PMENE1:13 AMN233,781 mi
18
93%-9:06 AMWNW8:13 PMENE2:11 AMN237,073 mi
19
86%-9:49 AMWNW9:11 PMENE3:04 AMN240,524 mi
20
78%-10:27 AMWNW10:05 PMENE3:51 AMS243,839 mi
21
69%-11:00 AMW10:55 PME4:34 AMS246,753 mi
22
60%-11:32 AMW11:44 PME5:15 AMS249,054 mi
23
50%-12:01 PMW-5:54 AMS250,593 mi
24
40%12:32 AME12:31 PMW-6:32 AMS251,292 mi
25
31%1:21 AMESE1:03 PMWSW-7:12 AMS251,144 mi
26
22%2:11 AMESE1:37 PMWSW-7:54 AMS250,204 mi
27
15%3:04 AMESE2:15 PMWSW-8:39 AMS248,590 mi
28
8%3:59 AMESE2:58 PMWSW-9:28 AMS246,461 mi
29
3%4:56 AMESE3:48 PMWSW-10:22 AMS244,009 mi
30
1%5:55 AMESE4:43 PMWSW-11:19 AMS241,437 mi
31
0%6:51 AMESE5:43 PMWSW-12:17 PMS238,935 mi

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Hanoi is rapidly decreasing during December, falling from 30% to 16% over the course of the month.

For reference, on August 3, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 21, the least muggy day of the year, there are muggy conditions 15% of the time.

Humidity Comfort Levels in December in Hanoi

Humidity Comfort Levels in December in HanoiDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%NovJanDec 130%Dec 130%Dec 3116%Dec 3116%Dec 1121%Dec 1121%Dec 2118%Dec 2118%NowNowoppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydrymiserablemiserable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Hanoi is essentially constant during December, remaining within 0.1 miles per hour of 6.4 miles per hour throughout.

For reference, on March 10, the windiest day of the year, the daily average wind speed is 7.9 miles per hour, while on August 18, the calmest day of the year, the daily average wind speed is 5.1 miles per hour.

Average Wind Speed in December in Hanoi

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction in Hanoi during December is predominantly out of the north from December 1 to December 17 and the east from December 17 to December 31.

Wind Direction in December in Hanoi

Wind Direction in December in HanoiNEDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%NovJanNowNowsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Hanoi is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Hanoi is decreasing during December, falling by 5°F, from 75°F to 70°F, over the course of the month.

Average Water Temperature in December in Hanoi

Average Water Temperature in December in HanoiDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313164°F64°F66°F66°F68°F68°F70°F70°F72°F72°F74°F74°F76°F76°F78°F78°F80°F80°F82°F82°F84°F84°FNovJanDec 175°FDec 175°FDec 3170°FDec 3170°FDec 1173°FDec 1173°FDec 2171°FDec 2171°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Hanoi are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in December in Hanoi

Time Spent in Various Temperature Bands and the Growing Season in December in HanoiDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJan100%Dec 16100%Dec 16NowNowcoldcoolcomfortablewarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Hanoi are rapidly increasing during December, increasing by 454°F, from 8,618°F to 9,072°F, over the course of the month.

Growing Degree Days in December in Hanoi

The average growing degree days accumulated over the course of December, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Hanoi is essentially constant during December, remaining within 0.1 kWh of 4.0 kWh throughout.

Average Daily Incident Shortwave Solar Energy in December in Hanoi

Average Daily Incident Shortwave Solar Energy in December in HanoiDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWh4.5 kWh4.5 kWh5.0 kWh5.0 kWh5.5 kWh5.5 kWh6.0 kWh6.0 kWhNovJanDec 14.1 kWhDec 14.1 kWhDec 313.9 kWhDec 313.9 kWhDec 114.0 kWhDec 114.0 kWhDec 213.9 kWhDec 213.9 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Hanoi are 21.024 deg latitude, 105.841 deg longitude, and 33 ft elevation.

The topography within 2 miles of Hanoi contains only modest variations in elevation, with a maximum elevation change of 108 feet and an average elevation above sea level of 46 feet. Within 10 miles also contains only modest variations in elevation (217 feet). Within 50 miles contains only modest variations in elevation (5,387 feet).

The area within 2 miles of Hanoi is covered by cropland (43%), artificial surfaces (29%), and water (14%), within 10 miles by cropland (60%) and grassland (12%), and within 50 miles by cropland (49%) and trees (23%).

This report illustrates the typical weather in Hanoi, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There is only a single weather station, Noi Bai International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Hanoi.

At a distance of 22 kilometers from Hanoi, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Hanoi according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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