December Weather in Arrifes Portugal

Daily high temperatures decrease by 2°F, from 63°F to 61°F, rarely falling below 57°F or exceeding 66°F.

Daily low temperatures are around 55°F, rarely falling below 49°F or exceeding 61°F.

For reference, on August 14, the hottest day of the year, temperatures in Arrifes typically range from 66°F to 75°F, while on February 17, the coldest day of the year, they range from 53°F to 60°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.

Avalon, United States (4,991 miles away) and Minas de Marcona, Peru (4,869 miles) are the far-away foreign places with temperatures most similar to Arrifes (view comparison).

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The month of December in Arrifes experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 61% throughout the month. The highest chance of overcast or mostly cloudy conditions is 62% on December 21.

The clearest day of the month is December 29, with clear, mostly clear, or partly cloudy conditions 39% of the time.

For reference, on December 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 62%, while on July 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 80%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Arrifes, the chance of a wet day over the course of December is essentially constant, remaining around 30% throughout.

For reference, the year's highest daily chance of a wet day is 31% on December 5, and its lowest chance is 4% on July 26.

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 Arrifes is gradually decreasing, starting the month at 2.9 inches, when it rarely exceeds 5.5 inches or falls below 0.7 inches, and ending the month at 2.5 inches, when it rarely exceeds 5.1 inches or falls below 0.5 inches.

The highest average 31-day accumulation is 3.0 inches on December 11.

Over the course of December in Arrifes, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 33 minutes of daylight and the longest day is December 1, with 9 hours, 44 minutes of daylight.

The earliest sunrise of the month in Arrifes is 7:39 AM on December 1 and the latest sunrise is 18 minutes later at 7:58 AM on December 31.

The earliest sunset is 5:23 PM on December 5 and the latest sunset is 10 minutes later at 5:34 PM on December 31.

Daylight saving time is observed in Arrifes 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 6:21 AM and sets 14 hours, 47 minutes later, at 9:07 PM, while on December 21, the shortest day of the year, it rises at 7:54 AM and sets 9 hours, 33 minutes later, at 5:27 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 Arrifes is essentially constant during December, remaining around 0% throughout.

The lowest chance of a muggy day during December is 0% on December 29.

For reference, on August 12, the muggiest day of the year, there are muggy conditions 46% of the time, while on December 27, 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 Arrifes is gradually increasing during December, increasing from 16.8 miles per hour to 17.6 miles per hour over the course of the month.

For reference, on December 24, the windiest day of the year, the daily average wind speed is 17.8 miles per hour, while on July 17, the calmest day of the year, the daily average wind speed is 10.0 miles per hour.

The highest daily average wind speed during December is 17.8 miles per hour on December 25.

The wind direction in Arrifes during December is predominantly out of the west from December 1 to December 4 and from December 18 to December 31 and the south from December 4 to December 18.

Arrifes 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 Arrifes is gradually decreasing during December, falling by 2°F, from 65°F to 63°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 Arrifes 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 Arrifes are increasing during December, increasing by 263°F, from 4,136°F to 4,399°F, over the course of the month.

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 Arrifes is essentially constant during December, remaining within 0.1 kWh of 2.0 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 2.0 kWh on December 14.

For the purposes of this report, the geographical coordinates of Arrifes are 37.767 deg latitude, -25.700 deg longitude, and 633 ft elevation.

The topography within 2 miles of Arrifes contains very significant variations in elevation, with a maximum elevation change of 1,542 feet and an average elevation above sea level of 603 feet. Within 10 miles contains very significant variations in elevation (2,776 feet). Within 50 miles contains large variations in elevation (3,553 feet).

The area within 2 miles of Arrifes is covered by trees (49%), grassland (21%), and shrubs (19%), within 10 miles by water (71%) and grassland (16%), and within 50 miles by water (97%).