December Weather in Belmullet Ireland

Daily high temperatures are around 50°F, rarely falling below 44°F or exceeding 55°F.

Daily low temperatures decrease by 2°F, from 44°F to 42°F, rarely falling below 37°F or exceeding 50°F.

For reference, on August 1, the hottest day of the year, temperatures in Belmullet typically range from 55°F to 62°F, while on February 17, the coldest day of the year, they range from 42°F to 49°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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.

Quellón, Chile (7,706 miles away) is the far-away foreign place with temperatures most similar to Belmullet (view comparison).

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The month of December in Belmullet experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 68% throughout the month.

The clearest day of the month is December 2, with clear, mostly clear, or partly cloudy conditions 34% of the time.

For reference, on January 28, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 70%, while on May 30, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 45%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Belmullet, the chance of a wet day over the course of December is increasing, starting the month at 50% and ending it at 56%.

For reference, the year's highest daily chance of a wet day is 56% on January 3, and its lowest chance is 31% on June 12.

Rainfall

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

The average sliding 31-day rainfall during December in Belmullet is essentially constant, remaining about 4.4 inches throughout, and rarely exceeding 7.1 inches or falling below 2.1 inches.

The highest average 31-day accumulation is 4.4 inches on December 26.

Over the course of December in Belmullet, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 17 minutes, implying an average daily decrease of 34 seconds, and weekly decrease of 4 minutes, 1 second.

The shortest day of the month is December 21, with 7 hours, 20 minutes of daylight and the longest day is December 1, with 7 hours, 43 minutes of daylight.

The earliest sunrise of the month in Belmullet is 8:37 AM on December 1 and the latest sunrise is 23 minutes later at 9:00 AM on December 29.

The earliest sunset is 4:16 PM on December 14 and the latest sunset is 10 minutes later at 4:26 PM on December 31.

Daylight saving time is observed in Belmullet during 2024, but it neither starts nor ends during December, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:05 AM and sets 17 hours, 12 minutes later, at 10:17 PM, while on December 21, the shortest day of the year, it rises at 8:58 AM and sets 7 hours, 20 minutes later, at 4:18 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 December 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 in Belmullet is essentially constant during December, remaining around 0% throughout.

For reference, on August 31, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, 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 Belmullet is rapidly increasing during December, increasing from 20.1 miles per hour to 22.1 miles per hour over the course of the month.

For reference, on January 2, the windiest day of the year, the daily average wind speed is 22.2 miles per hour, while on July 22, the calmest day of the year, the daily average wind speed is 13.8 miles per hour.

The hourly average wind direction in Belmullet throughout December is predominantly from the west, with a peak proportion of 39% on December 31.

Belmullet is 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.

The average surface water temperature in Belmullet is gradually decreasing during December, falling by 2°F, from 52°F to 50°F, over the course of the month.

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 Belmullet 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 Belmullet are essentially constant during December, remaining within 9°F of 1,119°F throughout.

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 Belmullet is essentially constant during December, remaining within 0.1 kWh of 0.5 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 0.4 kWh on December 21.

For the purposes of this report, the geographical coordinates of Belmullet are 54.225 deg latitude, -9.991 deg longitude, and 10 ft elevation.

The topography within 2 miles of Belmullet contains only modest variations in elevation, with a maximum elevation change of 187 feet and an average elevation above sea level of 43 feet. Within 10 miles contains only modest variations in elevation (853 feet). Within 50 miles contains very significant variations in elevation (2,635 feet).

The area within 2 miles of Belmullet is covered by grassland (42%), water (27%), and cropland (12%), within 10 miles by water (59%) and herbaceous vegetation (18%), and within 50 miles by water (74%) and herbaceous vegetation (12%).