Spring Weather at Arusha Airport Tanzania

Daily high temperatures increase by 4°F, from 75°F to 79°F, rarely falling below 71°F or exceeding 84°F.

Daily low temperatures increase by 4°F, from 57°F to 61°F, rarely falling below 53°F or exceeding 63°F. The highest daily average low temperature is 61°F on November 15.

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 13, 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 spring 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 spring at Arusha Airport experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 30% to 62%.

The clearest day of the spring is September 1, 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 August 31, 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 spring is very rapidly increasing, starting the season at 1% and ending it at 27%.

For reference, the year's highest daily chance of a wet day is 45% on April 19, and its lowest chance is 1% on September 6.

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 spring at Arusha Airport is very rapidly increasing, starting the season at 0.1 inches, when it rarely exceeds 0.3 inches or falls below -0.0 inches, and ending the season at 2.3 inches, when it rarely exceeds 5.2 inches or falls below 0.2 inches.

Over the course of the spring at Arusha Airport, the length of the day is gradually increasing. From the start to the end of the season, the length of the day increases by 15 minutes, implying an average daily increase of 10 seconds, and weekly increase of 1 minute, 12 seconds.

The shortest day of the spring is September 1, with 12 hours, 3 minutes of daylight and the longest day is November 30, with 12 hours, 18 minutes of daylight.

The latest sunrise of the spring at Arusha Airport is 6:32 AM on September 1 and the earliest sunrise is 22 minutes earlier at 6:09 AM on November 9.

The latest sunset is 6:34 PM on September 1 and the earliest sunset is 11 minutes earlier at 6:23 PM on October 27.

Daylight saving time is not observed at Arusha Airport during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 6:22 AM and sets 12 hours, 19 minutes later, at 6:41 PM, while on June 20, 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 spring of 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.

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 increasing during the spring, rising from 0% to 6% over the course of the season.

For reference, on April 8, the muggiest day of the year, there are muggy conditions 19% of the time, while on July 28, 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 decreasing during the spring, decreasing from 10.7 miles per hour to 7.1 miles per hour over the course of the season.

For reference, on September 24, 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 highest daily average wind speed during the spring is 11.0 miles per hour on September 25.

The hourly average wind direction at Arusha Airport throughout the spring is predominantly from the east, with a peak proportion of 96% on November 5.

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 increasing during the spring, increasing by 1,681°F, from 837°F to 2,518°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 decreasing during the spring, falling by 0.6 kWh, from 7.2 kWh to 6.6 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the spring is 7.5 kWh on September 30.

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%).