Winter Weather at Arusha Airport Tanzania

Daily high temperatures are around 73°F, rarely falling below 68°F or exceeding 78°F. The lowest daily average high temperature is 71°F on July 2.

Daily low temperatures are around 57°F, rarely falling below 52°F or exceeding 61°F. The lowest daily average low temperature is 56°F on July 14.

For reference, on February 17, the hottest day of the year, temperatures at Arusha Airport typically range from 60°F to 83°F, while on July 14, the coldest day of the year, they range from 56°F to 71°F.

The figure below shows you a compact characterization of the hourly average winter temperatures. 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.

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The winter at Arusha Airport experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 49% to 29%.

The clearest day of the winter is August 31, with clear, mostly clear, or partly cloudy conditions 70% of the time.

For reference, on February 2, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on September 1, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Arusha Airport, the chance of a wet day over the course of the winter is very rapidly decreasing, starting the season at 11% and ending it at 1%.

For reference, the year's highest daily chance of a wet day is 45% on April 20, and its lowest chance is 1% on September 7.

Rainfall

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

The average sliding 31-day rainfall during the winter at Arusha Airport is decreasing, starting the season at 0.8 inches, when it rarely exceeds 1.9 inches, and ending the season at 0.1 inches, when it rarely exceeds 0.3 inches or falls below -0.0 inches.

The lowest average 31-day accumulation is 0.1 inches on July 7.

Over the course of the winter at Arusha Airport, the length of the day is essentially constant. The shortest day of the winter is June 22, with 11 hours, 56 minutes of daylight and the longest day is August 31, with 12 hours, 3 minutes of daylight.

The latest sunrise of the winter at Arusha Airport is 6:41 AM on July 22 and the earliest sunrise is 9 minutes earlier at 6:32 AM on August 31.

The earliest sunset is 6:29 PM on June 1 and the latest sunset is 9 minutes later at 6:39 PM on August 1.

Daylight saving time is not observed at Arusha Airport during 2026.

For reference, on December 21, the longest day of the year, the Sun rises at 6:21 AM and sets 12 hours, 19 minutes later, at 6:41 PM, while on June 21, the shortest day of the year, it rises at 6:37 AM and sets 11 hours, 56 minutes later, at 6:33 PM.

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.

The figure below presents a compact representation of key lunar data for the winter of 2026. 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.

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 at Arusha Airport is essentially constant during the winter, remaining within 1% of 1% throughout.

The lowest chance of a muggy day during the winter is 0% on July 29.

For reference, on April 9, the muggiest day of the year, there are muggy conditions 19% of the time, while on July 29, the least muggy day of the year, there are muggy conditions 0% of the time.

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 at Arusha Airport is rapidly increasing during the winter, increasing from 8.7 miles per hour to 10.7 miles per hour over the course of the season.

For reference, on September 25, the windiest day of the year, the daily average wind speed is 11.0 miles per hour, while on January 29, the calmest day of the year, the daily average wind speed is 5.3 miles per hour.

The lowest daily average wind speed during the winter is 8.6 miles per hour on June 8.

The wind direction at Arusha Airport during the winter is predominantly out of the south from June 1 to July 25 and the east from July 25 to August 31.

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 at Arusha Airport 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.

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 at Arusha Airport are very rapidly decreasing during the winter, decreasing by 5,284°F, from 6,106°F to 822°F, over the course of the season.

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 at Arusha Airport is gradually increasing during the winter, rising by 0.9 kWh, from 6.3 kWh to 7.2 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 6.2 kWh on June 19.

For the purposes of this report, the geographical coordinates of Arusha Airport are -3.368 deg latitude, 36.625 deg longitude, and 4,547 ft elevation.

The topography within 2 miles of Arusha Airport contains only modest variations in elevation, with a maximum elevation change of 427 feet and an average elevation above sea level of 4,558 feet. Within 10 miles contains only modest variations in elevation (5,915 feet). Within 50 miles also contains extreme variations in elevation (12,644 feet).

The area within 2 miles of Arusha Airport is covered by cropland (99%), within 10 miles by cropland (57%) and grassland (17%), and within 50 miles by shrubs (34%) and grassland (25%).