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the wet season is hot and mostly cloudy; the dry season is warm, windy, and
mostly clear; and it is oppressive year round. Over the course of the year, the
temperature typically varies from 70°F to 90°F and is rarely
below 68°F or above 93°F.
Based on the beach/pool
score, the best time of year
to visit Tanga for hot-weather activities is from mid June to early
The hot season
lasts for 3.0 months, from December 26 to March 27, with
an average daily high temperature above 88°F. The hottest day of the
year is February 18, with an average high of 90°F and low of 76°F.
The cool season
lasts for 3.2 months, from June 4 to September 9, with an
average daily high temperature below 83°F. The coldest day of the year
is August 25, with an average low of 70°F and high of 82°F.
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.
Maceió, Brazil (5,135 miles away) is the far-away foreign place with temperatures
most similar to Tanga (view comparison
In Tanga, the
average percentage of the sky covered by clouds experiences significant
seasonal variation over the course of the year.
The clearer part of the year in Tanga begins
around May 18 and lasts
for 5.7 months, ending
around November 7. On September 1, the clearest day of the year,
the sky is clear, mostly clear, or partly cloudy 75% of the time, and overcast or mostly cloudy 25% of the time.
The cloudier part of the year begins around November 7 and lasts for 6.3 months, ending around May 18. On March 15, the cloudiest day of the year, the sky is overcast or mostly cloudy 73% of the time, and clear, mostly clear, or partly cloudy 27% of the time.
A wet day is one with
at least 0.04 inches of liquid or liquid-equivalent
precipitation. The chance of wet days in Tanga varies very significantly
throughout the year.
season lasts 6.4 months, from November
13 to May 25, with a greater than 34%
chance of a given day being a wet day. The chance of a wet day peaks at 62%
on April 21.
season lasts 5.6 months, from May
25 to November 13. The smallest chance
of a wet day is 6% on September 11.
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 62% on April
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. Tanga experiences extreme seasonal variation in monthly
The rainy period of
the year lasts for 11 months, from September 11 to August 26, with a sliding 31-day rainfall of
at least 0.5 inches. The most rain falls
during the 31 days centered around April 27, with an
average total accumulation of 6.5 inches.
The rainless period of
the year lasts for 2.3 weeks, from August 26 to September 11. The least rain falls around September 5, with an
average total accumulation of 0.5 inches.
The length of
the day in Tanga does not vary substantially over the course of the year,
staying within 25 minutes of 12 hours throughout. In 2019, the shortest
day is June 21, with 11 hours, 50 minutes of daylight;
the longest day is December 22, with 12 hours, 25 minutes of daylight.
sunrise is at 5:57 AM on November 11, and the latest
sunrise is 36 minutes later at 6:34
AM on July 20. The earliest
sunset is at 6:15 PM on October 24, and the latest
sunset is 31 minutes later at 6:46
PM on February 2.
saving time (DST) is not observed in Tanga during 2019.
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.
humidity level in Tanga, as measured by the percentage of time in which the
humidity comfort level is muggy, oppressive, or miserable,
does not vary significantly over the course of the year, staying within 3%
of 97% throughout.
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.
hourly wind speed in Tanga experiences significant seasonal variation
over the course of the year.
part of the year lasts for 5.2 months, from April
26 to October 1, with average wind
speeds of more than 10.6 miles per hour. The windiest
day of the year is June 25, with an average hourly
wind speed of 13.5 miles per hour.
time of year lasts for 6.8 months, from October
1 to April 26. The calmest
day of the year is March 25, with an average hourly
wind speed of 7.6 miles per hour.
predominant average hourly wind direction in Tanga varies throughout the year.
The wind is
most often from the south for 6.5 months, from April 2 to October 19, with a peak percentage of 100% on June 24. The wind is
most often from the east for 5.4 months, from October 19 to April 2, with a peak percentage of 53% on January 1.
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.
water temperature experiences some seasonal variation over the
course of the year.
The time of
year with warmer water lasts for 2.0
months, from February 27 to April
29, with an average temperature above 83°F. The day of the
year with the warmest water is March 27, with an average
temperature of 84°F.
The time of
year with cooler water lasts for 3.0
months, from July 4 to October 2, with an
average temperature below 79°F. The day of the year with
the coolest water is August 13, with an average temperature
characterize how pleasant the weather is in Tanga throughout the year, we
compute two travel scores.
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 Tanga for general outdoor tourist
activities is from late June to mid
September, with a peak score in the third week of August.
score favors clear, rainless days with perceived temperatures
between 75°F and 90°F. Based on this score,
the best time of year to visit Tanga for hot-weather activities is from mid
June to early October, with a peak score
in the first week of September.
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.
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.
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).
in Tanga 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.
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.
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.
daily incident shortwave solar energy experiences some seasonal
variation over the course of the year.
period of the year lasts for 2.1 months, from September
6 to November 9, with an average daily
incident shortwave energy per square meter above 6.9 kWh. The brightest
day of the year is October 10, with an average of 7.2
period of the year lasts for 3.8 months, from March
19 to July 13, with an average daily incident
shortwave energy per square meter below 5.8 kWh. The darkest
day of the year is April 9, with an average of 5.5
purposes of this report, the geographical coordinates of Tanga are -5.069 deg
latitude, 39.099 deg longitude, and 30 ft elevation.
topography within 2 miles of Tanga contains only modest
variations in elevation, with a maximum elevation change of 184
feet and an average elevation above sea level of 49
feet. Within 10 miles also contains only modest
variations in elevation (469 feet). Within 50
miles contains only modest variations in elevation (6,739
within 2 miles of Tanga is covered by artificial
surfaces (35%), water (22%),
and trees (14%), within 10
miles by water (38%) and shrubs
and within 50 miles by water (43%)
and trees (21%).
illustrates the typical weather in Tanga, based on a statistical analysis of
historical hourly weather reports and model reconstructions from January 1,
1980 to December 31, 2016.
There are 2
weather stations near enough to contribute to our estimation of the temperature
and dew point in Tanga.
station, the records are corrected for the elevation difference between that
station and Tanga according to the International Standard Atmosphere
, and by the relative change present in the MERRA-2 satellite-era
reanalysis between the two locations.
value at Tanga is computed as the weighted average of the individual
contributions from each station, with weights proportional to the inverse of
the distance between Tanga and a given station.
contributing to this reconstruction are: Mombasa Airport (50%, 128 kilometers, northeast) and Abeid Amani Karume International Airport (50%, 129 kilometers, south).
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
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.
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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