Winter Weather at Otjiwarongo Namibia

Daily high temperatures increase by 8°F, from 78°F to 86°F, rarely falling below 71°F or exceeding 90°F. The lowest daily average high temperature is 76°F on July 5.

Daily low temperatures increase by 7°F, from 43°F to 50°F, rarely falling below 35°F or exceeding 55°F. The lowest daily average low temperature is 41°F on June 22.

For reference, on December 4, the hottest day of the year, temperatures at Otjiwarongo typically range from 61°F to 90°F, while on June 22, the coldest day of the year, they range from 41°F to 76°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.

Jalpa, Mexico (8,578 miles away) is the far-away foreign place with temperatures most similar to Otjiwarongo (view comparison).

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The winter at Otjiwarongo experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 7% throughout the season. The lowest chance of overcast or mostly cloudy conditions is 5% on June 12.

The clearest day of the winter is June 12, with clear, mostly clear, or partly cloudy conditions 95% of the time.

For reference, on January 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 61%, while on June 12, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 95%.

Over the course of the winter at Otjiwarongo, the length of the day is increasing. From the start to the end of the season, the length of the day increases by 44 minutes, implying an average daily increase of 29 seconds, and weekly increase of 3 minutes, 22 seconds.

The shortest day of the winter is June 20, with 10 hours, 54 minutes of daylight and the longest day is August 31, with 11 hours, 42 minutes of daylight.

The latest sunrise of the winter at Otjiwarongo is 7:30 AM on July 5 and the earliest sunrise is 27 minutes earlier at 7:02 AM on August 31.

The earliest sunset is 6:20 PM on June 4 and the latest sunset is 24 minutes later at 6:44 PM on August 31.

Daylight saving time is not observed at Otjiwarongo during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 6:10 AM and sets 13 hours, 22 minutes later, at 7:32 PM, while on June 20, the shortest day of the year, it rises at 7:28 AM and sets 10 hours, 54 minutes later, at 6:21 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 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 Otjiwarongo is essentially constant during the winter, remaining around 0% throughout.

For reference, on March 1, the muggiest day of the year, there are muggy conditions 1% of the time, while on May 5, 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 Otjiwarongo is essentially constant during the winter, remaining within 0.5 miles per hour of 9.5 miles per hour throughout.

For reference, on July 15, the windiest day of the year, the daily average wind speed is 10.0 miles per hour, while on March 11, the calmest day of the year, the daily average wind speed is 7.1 miles per hour.

The highest daily average wind speed during the winter is 10.0 miles per hour on July 15.

The hourly average wind direction at Otjiwarongo throughout the winter is predominantly from the east, with a peak proportion of 61% on July 2.

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).

While it does not do so every year, freezing temperatures are seen at Otjiwarongo over some winters. The day least likely to be in the growing season is June 26, with a 68% chance.

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 Otjiwarongo are very rapidly decreasing during the winter, decreasing by 5,843°F, from 6,617°F to 774°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 Otjiwarongo is increasing during the winter, rising by 1.3 kWh, from 5.3 kWh to 6.5 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 5.1 kWh on June 24.