December Weather in Ponta Delgada Portugal
Daily high temperatures decrease by 2°F, from 65°F to 63°F, rarely falling below 59°F or exceeding 68°F.
Daily low temperatures are around 57°F, rarely falling below 51°F or exceeding 64°F.
For reference, on August 14, the hottest day of the year, temperatures in Ponta Delgada typically range from 68°F to 77°F, while on February 9, the coldest day of the year, they range from 55°F to 62°F.
Average High and Low Temperature in December in Ponta Delgada
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.
Average Hourly Temperature in December in Ponta Delgada
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The month of December in Ponta Delgada 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 22.
The clearest day of the month is December 30, with clear, mostly clear, or partly cloudy conditions 39% of the time.
For reference, on December 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 62%, while on July 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 80%.
Cloud Cover Categories in December in Ponta Delgada
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Ponta Delgada, 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 6, and its lowest chance is 4% on July 17.
Probability of Precipitation in December in Ponta Delgada
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 Ponta Delgada is gradually decreasing, starting the month at 2.9 inches, when it rarely exceeds 5.4 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 12.
Average Monthly Rainfall in December in Ponta Delgada
Over the course of December in Ponta Delgada, the length of the day is essentially constant. The shortest day of the month is December 22, with 9 hours, 33 minutes of daylight and the longest day is December 1, with 9 hours, 45 minutes of daylight.
Hours of Daylight and Twilight in December in Ponta Delgada
The earliest sunrise of the month in Ponta Delgada is 7:39 AM on December 1 and the latest sunrise is 19 minutes later at 7:57 AM on December 31.
The earliest sunset is 5:23 PM on December 6 and the latest sunset is 10 minutes later at 5:33 PM on December 31.
Daylight saving time is observed in Ponta Delgada during 2021, but it neither starts nor ends during December, so the entire month is in standard time.
For reference, on June 21, 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.
Sunrise & Sunset with Twilight in December in Ponta Delgada
The figure below presents a compact representation of key lunar data for December 2021. 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.
Moon Rise, Set & Phases in December in Ponta Delgada
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 Ponta Delgada is essentially constant during December, remaining within 1% of 1% throughout.
For reference, on August 27, the muggiest day of the year, there are muggy conditions 49% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in December in Ponta Delgada
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Ponta Delgada is gradually increasing during December, increasing from 16.7 miles per hour to 17.5 miles per hour over the course of the month.
For reference, on December 26, the windiest day of the year, the daily average wind speed is 17.8 miles per hour, while on July 18, 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 26.
Average Wind Speed in December in Ponta Delgada
The wind direction in Ponta Delgada during December is predominantly out of the west from December 1 to December 6 and from December 18 to December 31 and the south from December 6 to December 18.
Wind Direction in December in Ponta Delgada
Ponta Delgada 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 Ponta Delgada is gradually decreasing during December, falling by 2°F, from 65°F to 63°F, over the course of the month.
Average Water Temperature in December in Ponta Delgada
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 Ponta Delgada 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.
Time Spent in Various Temperature Bands and the Growing Season in December in Ponta Delgada
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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 Ponta Delgada are increasing during December, increasing by 324°F, from 4,824°F to 5,148°F, over the course of the month.
Growing Degree Days in December in Ponta Delgada
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 Ponta Delgada is essentially constant during December, remaining within 0.1 kWh of 2.1 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.0 kWh on December 15.
Average Daily Incident Shortwave Solar Energy in December in Ponta Delgada
For the purposes of this report, the geographical coordinates of Ponta Delgada are 37.733 deg latitude, -25.667 deg longitude, and 0 ft elevation.
The topography within 2 miles of Ponta Delgada contains significant variations in elevation, with a maximum elevation change of 630 feet and an average elevation above sea level of 70 feet. Within 10 miles contains significant variations in elevation (3,074 feet). Within 50 miles contains large variations in elevation (3,537 feet).
The area within 2 miles of Ponta Delgada is covered by water (72%) and grassland (14%), within 10 miles by water (73%) and grassland (15%), and within 50 miles by water (97%).
This report illustrates the typical weather in Ponta Delgada, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Ponta Delgada.
For each station, the records are corrected for the elevation difference between that station and Ponta Delgada according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Ponta Delgada is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Ponta Delgada and a given station.
The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of Ponta Delgada and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for airports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.