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Winter Weather in Aveiro Portugal

Daily high temperatures are around 58°F, rarely falling below 52°F or exceeding 66°F. The lowest daily average high temperature is 57°F on January 14.

Daily low temperatures are around 43°F, rarely falling below 32°F or exceeding 54°F. The lowest daily average low temperature is 41°F on January 15.

For reference, on July 28, the hottest day of the year, temperatures in Aveiro typically range from 59°F to 76°F, while on January 15, the coldest day of the year, they range from 41°F to 57°F.

Average High and Low Temperature in the Winter in Aveiro

Average High and Low Temperature in the Winter in AveiroDecJanFeb30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°FFallSpringJan 1457°FJan 1457°F41°F41°FDec 159°FDec 159°F44°F44°FFeb 2860°FFeb 2860°F43°F43°FJan 157°FJan 157°F42°F42°FFeb 158°FFeb 158°F42°F42°F
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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.

Average Hourly Temperature in the Winter in Aveiro

Average Hourly Temperature in the Winter in AveiroDecJanFeb12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMFallSpringvery coldcoldcoldcool
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Hamilton, New Zealand (12,162 miles away) is the far-away foreign place with temperatures most similar to Aveiro (view comparison).

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The winter in Aveiro experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 52% to 47%. The highest chance of overcast or mostly cloudy conditions is 55% on December 15.

The clearest day of the winter is February 28, with clear, mostly clear, or partly cloudy conditions 53% of the time.

For reference, on December 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 55%, while on July 19, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 87%.

Cloud Cover Categories in the Winter in Aveiro

Cloud Cover Categories in the Winter in AveiroDecJanFeb0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpringJul 1987%Jul 1987%Dec 147%Dec 147%Feb 2853%Feb 2853%Jan 146%Jan 146%Feb 150%Feb 150%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Aveiro, the chance of a wet day over the course of the winter is rapidly decreasing, starting the season at 33% and ending it at 26%.

For reference, the year's highest daily chance of a wet day is 37% on October 29, and its lowest chance is 4% on July 21.

Probability of Precipitation in the Winter in Aveiro

Probability of Precipitation in the Winter in AveiroDecJanFeb0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%FallSpringDec 133%Dec 133%Feb 2826%Feb 2826%Jan 134%Jan 134%Feb 129%Feb 129%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

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 Aveiro is rapidly decreasing, starting the season at 4.5 inches, when it rarely exceeds 9.3 inches or falls below 0.7 inches, and ending the season at 2.8 inches, when it rarely exceeds 6.2 inches or falls below 0.4 inches.

The highest average 31-day accumulation is 4.8 inches on December 26.

Average Monthly Rainfall in the Winter in Aveiro

Average Monthly Rainfall in the Winter in AveiroDecJanFeb0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 inFallSpringDec 264.8 inDec 264.8 inDec 14.5 inDec 14.5 inFeb 282.8 inFeb 282.8 inFeb 13.5 inFeb 13.5 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of the winter in Aveiro, the length of the day is rapidly increasing. From the start to the end of the season, the length of the day increases by 1 hour, 47 minutes, implying an average daily increase of 1 minute, 12 seconds, and weekly increase of 8 minutes, 23 seconds.

The shortest day of the winter is December 21, with 9 hours, 16 minutes of daylight and the longest day is February 28, with 11 hours, 15 minutes of daylight.

Hours of Daylight and Twilight in the Winter in Aveiro

Hours of Daylight and Twilight in the Winter in AveiroDecJanFeb0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrFallSpringDec 219 hr, 16 minDec 219 hr, 16 minnightnightdaydayFeb 2811 hr, 15 minFeb 2811 hr, 15 minFeb 110 hr, 8 minFeb 110 hr, 8 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The latest sunrise of the winter in Aveiro is 7:58 AM on January 4 and the earliest sunrise is 49 minutes earlier at 7:09 AM on February 28.

The earliest sunset is 5:07 PM on December 7 and the latest sunset is 1 hour, 18 minutes later at 6:24 PM on February 28.

Daylight saving time is observed in Aveiro during 2024, but it neither starts nor ends during the winter, so the entire season is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 6:03 AM and sets 15 hours, 5 minutes later, at 9:08 PM, while on December 21, the shortest day of the year, it rises at 7:55 AM and sets 9 hours, 16 minutes later, at 5:10 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in the Winter in Aveiro

Sunrise & Sunset with Twilight and Daylight Saving Time in the Winter in AveiroDecJanFeb2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMFallSpring7:09 AM7:09 AMFeb 286:24 PMFeb 286:24 PM7:45 AM7:45 AMDec 75:07 PMDec 75:07 PM7:58 AM7:58 AMJan 45:20 PMJan 45:20 PM7:44 AM7:44 AMFeb 15:52 PMFeb 15:52 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the winter. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

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.

Solar Elevation and Azimuth in the Winter in Aveiro

Solar Elevation and Azimuth in the Winter in AveiroDecJanFeb12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMFallSpring00102030300101020
northeastsouthwest
Solar elevation and azimuth in the the winter of 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

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.

Moon Rise, Set & Phases in the Winter in Aveiro

Moon Rise, Set & Phases in the Winter in AveiroDecJanFeb12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMFallSpringNov 112:48 PMNov 112:48 PMNov 159:29 PMNov 159:29 PMDec 16:22 AMDec 16:22 AMDec 159:02 AMDec 159:02 AMDec 3010:28 PMDec 3010:28 PMJan 1310:28 PMJan 1310:28 PMJan 2912:37 PMJan 2912:37 PMFeb 121:54 PMFeb 121:54 PMFeb 2812:45 AMFeb 2812:45 AMMar 146:55 AMMar 146:55 AMMar 2910:58 AMMar 2910:58 AM5:16 PM5:16 PM4:44 PM4:44 PM8:12 AM8:12 AM8:06 AM8:06 AM4:57 PM4:57 PM8:16 AM8:16 AM4:35 PM4:35 PM4:53 PM4:53 PM8:41 AM8:41 AM8:04 AM8:04 AM5:48 PM5:48 PM6:06 PM6:06 PM8:08 AM8:08 AM7:29 AM7:29 AM7:12 PM7:12 PM6:03 PM6:03 PM6:53 AM6:53 AM7:19 PM7:19 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 Aveiro is essentially constant during the winter, remaining around 0% throughout.

For reference, on August 15, the muggiest day of the year, there are muggy conditions 7% 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 the Winter in Aveiro

Humidity Comfort Levels in the Winter in AveiroDecJanFeb0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%FallSpringDec 10%Dec 10%Feb 280%Feb 280%Jan 10%Jan 10%Feb 10%Feb 10%drydryhumidhumidcomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 Aveiro is essentially constant during the winter, remaining within 0.3 miles per hour of 7.1 miles per hour throughout.

For reference, on December 26, the windiest day of the year, the daily average wind speed is 7.4 miles per hour, while on September 12, the calmest day of the year, the daily average wind speed is 5.7 miles per hour.

The highest daily average wind speed during the winter is 7.4 miles per hour on December 26.

Average Wind Speed in the Winter in Aveiro

Average Wind Speed in the Winter in AveiroDecJanFeb0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphFallSpringDec 267.4 mphDec 267.4 mphDec 17.1 mphDec 17.1 mphFeb 286.8 mphFeb 286.8 mphFeb 17.0 mphFeb 17.0 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction in Aveiro during the winter is predominantly out of the east from December 1 to December 25 and from January 15 to February 7, the south from December 25 to January 15, and the north from February 7 to February 28.

Wind Direction in the Winter in Aveiro

Wind Direction in the Winter in AveiroNESENDecJanFeb0%100%20%80%40%60%60%40%80%20%100%0%FallSpringwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Aveiro 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 Aveiro is gradually decreasing during the winter, falling by 3°F, from 60°F to 56°F, over the course of the season.

The lowest average surface water temperature during the winter is 56°F on February 19.

Average Water Temperature in the Winter in Aveiro

Average Water Temperature in the Winter in AveiroDecJanFeb54°F54°F56°F56°F58°F58°F60°F60°F62°F62°F64°F64°F66°F66°FFallSpringFeb 1956°FFeb 1956°FDec 160°FDec 160°FJan 158°FJan 158°FFeb 157°FFeb 157°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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).

The growing season in Aveiro typically lasts for 11 months (321 days), from around February 4 to around December 21, rarely starting after March 7, or ending before November 18.

The smallest chance that a given day will be within the growing season in Aveiro during the winter is 33% on January 11.

Time Spent in Various Temperature Bands and the Growing Season in the Winter in Aveiro

Time Spent in Various Temperature Bands and the Growing Season in the Winter in AveiroDecJanFeb0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpring79%Dec 179%Dec 181%Feb 2881%Feb 28Jan 137%Jan 137%Feb 147%Feb 147%33%Jan 1133%Jan 11very coldcoldcoolcomfortable
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 percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

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 Aveiro are very rapidly decreasing during the winter, decreasing by 3,108°F, from 3,258°F to 150°F, over the course of the season.

Growing Degree Days in the Winter in Aveiro

Growing Degree Days in the Winter in AveiroDecJanFeb500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°FFallSpringDec 13,258°FDec 13,258°FFeb 28150°FFeb 28150°F
The average growing degree days accumulated over the course of the winter, with 25th to 75th and 10th to 90th percentile bands.

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 Aveiro is rapidly increasing during the winter, rising by 1.7 kWh, from 1.9 kWh to 3.7 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 1.8 kWh on December 25.

Average Daily Incident Shortwave Solar Energy in the Winter in Aveiro

Average Daily Incident Shortwave Solar Energy in the Winter in AveiroDecJanFeb0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWhFallSpringDec 251.8 kWhDec 251.8 kWhDec 11.9 kWhDec 11.9 kWhFeb 283.7 kWhFeb 283.7 kWhFeb 12.5 kWhFeb 12.5 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Aveiro are 40.644 deg latitude, -8.646 deg longitude, and 62 ft elevation.

The topography within 2 miles of Aveiro contains only modest variations in elevation, with a maximum elevation change of 226 feet and an average elevation above sea level of 41 feet. Within 10 miles contains only modest variations in elevation (597 feet). Within 50 miles contains significant variations in elevation (4,511 feet).

The area within 2 miles of Aveiro is covered by artificial surfaces (35%), cropland (27%), water (18%), and herbaceous vegetation (16%), within 10 miles by cropland (28%) and trees (26%), and within 50 miles by water (42%) and trees (33%).

This report illustrates the typical weather in Aveiro, 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 Aveiro.

For each station, the records are corrected for the elevation difference between that station and Aveiro 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 Aveiro is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Aveiro and a given station.

The stations contributing to this reconstruction are:

  • Ovar Mil. (LPOV, 84%, 19 mi, north, -7 ft elevation change)
  • Monte Real Mil. (LPMR, 16%, 58 mi, south, 125 ft elevation change)

To get a sense of how much these sources agree with each other, you can view a comparison of Aveiro 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.

Other 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 © OpenStreetMap contributors.

Disclaimer

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.

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