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Average Weather in Trashigang Bhutan

In Trashigang, the wet season is warm and mostly cloudy and the dry season is cool and mostly clear. Over the course of the year, the temperature typically varies from 45°F to 80°F and is rarely below 40°F or above 86°F.

Based on the tourism score, the best time of year to visit Trashigang for warm-weather activities is from late September to mid November.

Climate Summary

coolcomfortablewarmcomfortablecoolJanFebMarAprMayJunJulAugSepOctNovDecNowNow90%90%14%14%clearovercastprecipitation: 8.9 inprecipitation: 8.9 in0.1 in0.1 inmuggy: 32%muggy: 32%0%0%drydrytourism score: 7.7tourism score: 7.72.52.5
Click on each chart for more information.

Temperature

The warm season lasts for 4.2 months, from June 5 to October 11, with an average daily high temperature above 76°F. The hottest day of the year is August 11, with an average high of 80°F and low of 68°F.

The cool season lasts for 2.4 months, from December 14 to February 25, with an average daily high temperature below 64°F. The coldest day of the year is January 21, with an average low of 45°F and high of 60°F.

Average High and Low Temperature

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 entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in TrashigangJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMNowNowcoldcoldcoldcoldcoolcoolcomfortablewarm
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.

Dieciocho de Julio, Uruguay (10,336 miles away) and Rabat, Morocco (5,631 miles) are the far-away foreign places with temperatures most similar to Trashigang (view comparison).

Clouds

In Trashigang, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in Trashigang begins around September 29 and lasts for 8.2 months, ending around June 3. On January 24, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 90% of the time, and overcast or mostly cloudy 10% of the time.

The cloudier part of the year begins around June 3 and lasts for 3.8 months, ending around September 29. On August 7, the cloudiest day of the year, the sky is overcast or mostly cloudy 87% of the time, and clear, mostly clear, or partly cloudy 14% of the time.

Cloud Cover Categories

Cloud Cover Categories in TrashigangclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jan 2490%Jan 2490%Aug 714%Aug 714%Sep 2951%Sep 2951%Jun 353%Jun 353%NowNowclearmostly clearovercastpartly cloudymostly cloudy
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.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Trashigang varies very significantly throughout the year.

The wetter season lasts 5.6 months, from April 7 to September 25, with a greater than 37% chance of a given day being a wet day. The chance of a wet day peaks at 72% on July 15.

The drier season lasts 6.4 months, from September 25 to April 7. The smallest chance of a wet day is 1% on December 6.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 72% on July 15.

Daily Chance of Precipitation

Daily Chance of Precipitation in TrashigangwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jul 1572%Jul 1572%Dec 61%Dec 61%Apr 737%Apr 737%Sep 2537%Sep 2537%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 months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Trashigang experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.2 months, from March 2 to November 8, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around July 7, with an average total accumulation of 8.9 inches.

The rainless period of the year lasts for 3.8 months, from November 8 to March 2. The least rain falls around December 31, with an average total accumulation of 0.1 inches.

Average Monthly Rainfall

Average Monthly Rainfall in TrashigangrainJanFebMarAprMayJunJulAugSepOctNovDec0 in2 in4 in6 in8 in10 in12 in14 inJul 78.9 inJul 78.9 inDec 310.1 inDec 310.1 inMar 20.5 inMar 20.5 inNov 80.5 inNov 80.5 inNowNow
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 liquid-equivalent snowfall.

Sun

The length of the day in Trashigang varies over the course of the year. In 2020, the shortest day is December 21, with 10 hours, 25 minutes of daylight; the longest day is June 21, with 13 hours, 52 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight in TrashigangJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2013 hr, 52 minJun 2113 hr, 52 minJun 2112 hr, 8 minSep 2212 hr, 8 minSep 2210 hr, 25 minDec 2110 hr, 25 minDec 21nightnightday
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 is at 4:58 AM on June 10, and the latest sunrise is 1 hour, 47 minutes later at 6:45 AM on January 13. The earliest sunset is at 4:59 PM on December 1, and the latest sunset is 1 hour, 54 minutes later at 6:52 PM on July 2.

Daylight saving time (DST) is not observed in Trashigang during 2020.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in TrashigangJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 104:58 AMJun 104:58 AM6:52 PMJul 26:52 PMJul 2Dec 14:59 PMDec 14:59 PM6:45 AMJan 136:45 AMJan 13daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2020. 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.

Humidity

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.

Trashigang experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.7 months, from May 27 to September 17, during which time the comfort level is muggy, oppressive, or miserable at least 8% of the time. The muggiest day of the year is July 13, with muggy conditions 32% of the time.

The least muggy day of the year is February 8, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in TrashigangmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 80%Feb 80%Jul 1332%Jul 1332%May 278%May 278%Sep 178%Sep 178%NowNowmuggymuggyhumidhumiddrydrycomfortablecomfortable
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.

Wind

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 Trashigang experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.8 months, from February 20 to August 13, with average wind speeds of more than 3.5 miles per hour. The windiest day of the year is April 10, with an average hourly wind speed of 4.1 miles per hour.

The calmer time of year lasts for 6.2 months, from August 13 to February 20. The calmest day of the year is December 23, with an average hourly wind speed of 2.9 miles per hour.

Average Wind Speed

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

The predominant average hourly wind direction in Trashigang varies throughout the year.

The wind is most often from the south for 10 months, from January 22 to November 25, with a peak percentage of 78% on July 8. The wind is most often from the north for 1.9 months, from November 25 to January 22, with a peak percentage of 45% on January 1.

Wind Direction

Wind Direction in TrashigangNSNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowsouthnorthwesteast
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).

Best Time of Year to Visit

To characterize how pleasant the weather is in Trashigang throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Trashigang for general outdoor tourist activities is from late September to mid November, with a peak score in the third week of October.

Tourism Score

Tourism Score in TrashigangJanFebMarAprMayJunJulAugSepOctNovDec02468107.77.72.52.56.66.64.14.1NowNow precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best times of year to visit Trashigang for hot-weather activities are for the entire month of June and from late July to early October, with a peak score in the third week of September.

Beach/Pool Score

Beach/Pool Score in Trashigangbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468103.83.80.00.03.63.6NowNow precipitationprecipitationcloudscloudsbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

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 Trashigang 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

Time Spent in Various Temperature Bands and the Growing Season in TrashigangJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%100%Feb 1100%Feb 199%Jan 999%Jan 9Jul 10100%Jul 10100%NowNowcoldcoolcomfortablewarmvery cold
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.

Growing Degree Days

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

Solar Energy

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 experiences some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.8 months, from March 8 to June 3, with an average daily incident shortwave energy per square meter above 6.2 kWh. The brightest day of the year is April 6, with an average of 6.7 kWh.

The darker period of the year lasts for 2.4 months, from November 12 to January 25, with an average daily incident shortwave energy per square meter below 4.7 kWh. The darkest day of the year is December 18, with an average of 4.3 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in TrashigangbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhApr 66.7 kWhApr 66.7 kWhDec 184.3 kWhDec 184.3 kWhJun 36.2 kWhJun 36.2 kWhJan 254.7 kWhJan 254.7 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.

Topography

For the purposes of this report, the geographical coordinates of Trashigang are 27.333 deg latitude, 91.554 deg longitude, and 4,423 ft elevation.

The topography within 2 miles of Trashigang contains extreme variations in elevation, with a maximum elevation change of 5,390 feet and an average elevation above sea level of 4,116 feet. Within 10 miles also contains extreme variations in elevation (11,572 feet). Within 50 miles also contains extreme variations in elevation (20,873 feet).

The area within 2 miles of Trashigang is covered by trees (68%) and cropland (27%), within 10 miles by trees (69%) and cropland (23%), and within 50 miles by trees (66%) and cropland (15%).

Data Sources

This report illustrates the typical weather in Trashigang, 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, Lokpriya Gopinath Bordoloi International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Trashigang.

At a distance of 137 kilometers from Trashigang, 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 Trashigang 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 aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.