Winter Weather in Wamena Indonesia

Daily high temperatures are around 74°F, rarely falling below 71°F or exceeding 78°F. The lowest daily average high temperature is 73°F on July 25.

Daily low temperatures are around 60°F, rarely falling below 57°F or exceeding 62°F. The lowest daily average low temperature is 59°F on July 15.

For reference, on October 30, the hottest day of the year, temperatures in Wamena typically range from 60°F to 76°F, while on July 12, the coldest day of the year, they range from 59°F to 74°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.

Mérida, Venezuela (10,359 miles away) is the far-away foreign place with temperatures most similar to Wamena (view comparison).

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The winter in Wamena experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 91% throughout the season. The lowest chance of overcast or mostly cloudy conditions is 90% on August 21.

The clearest day of the winter is August 21, with clear, mostly clear, or partly cloudy conditions 10% of the time.

For reference, on January 25, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 98%, while on August 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 10%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Wamena, the chance of a wet day over the course of the winter is essentially constant, remaining around 44% throughout.

For reference, the year's highest daily chance of a wet day is 55% on April 10, and its lowest chance is 41% on October 9.

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 in Wamena is essentially constant, remaining about 5.6 inches throughout, and rarely exceeding 10.2 inches or falling below 1.9 inches.

The lowest average 31-day accumulation is 5.4 inches on July 20.

Over the course of the winter in Wamena, the length of the day is essentially constant. The shortest day of the winter is June 23, with 11 hours, 53 minutes of daylight and the longest day is August 31, with 12 hours, 2 minutes of daylight.

The latest sunrise of the winter in Wamena is 5:53 AM on July 20 and the earliest sunrise is 9 minutes earlier at 5:43 AM on August 31.

The earliest sunset is 5:39 PM on June 1 and the latest sunset is 10 minutes later at 5:48 PM on August 2.

Daylight saving time is not observed in Wamena during 2026.

For reference, on December 21, the longest day of the year, the Sun rises at 5:31 AM and sets 12 hours, 22 minutes later, at 5:52 PM, while on June 21, the shortest day of the year, it rises at 5:49 AM and sets 11 hours, 53 minutes later, at 5:42 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 in Wamena is essentially constant during the winter, remaining around 1% throughout.

The lowest chance of a muggy day during the winter is 0% on July 12.

For reference, on November 12, the muggiest day of the year, there are muggy conditions 2% of the time, while on July 11, 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 in Wamena is essentially constant during the winter, remaining within 0.1 miles per hour of 3.2 miles per hour throughout.

For reference, on August 20, the windiest day of the year, the daily average wind speed is 3.4 miles per hour, while on April 20, the calmest day of the year, the daily average wind speed is 2.8 miles per hour.

The highest daily average wind speed during the winter is 3.4 miles per hour on August 20.

The hourly average wind direction in Wamena throughout the winter is predominantly from the east, with a peak proportion of 59% on August 30.

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 Wamena 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 in Wamena are very rapidly decreasing during the winter, decreasing by 4,554°F, from 5,476°F to 922°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 in Wamena is gradually increasing during the winter, rising by 0.5 kWh, from 3.9 kWh to 4.4 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Wamena are -4.095 deg latitude, 138.945 deg longitude, and 5,440 ft elevation.

The topography within 2 miles of Wamena contains only modest variations in elevation, with a maximum elevation change of 325 feet and an average elevation above sea level of 5,453 feet. Within 10 miles contains only modest variations in elevation (8,701 feet). Within 50 miles also contains extreme variations in elevation (15,367 feet).

The area within 2 miles of Wamena is covered by cropland (39%), shrubs (29%), and trees (25%), within 10 miles by trees (59%) and cropland (22%), and within 50 miles by trees (80%) and cropland (13%).