Climate and Average Weather Year Round at Ovar Mil. Portugal

At Ovar Mil., the summers are comfortable, dry, and mostly clear and the winters are cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 41°F to 74°F and is rarely below 32°F or above 85°F.

Based on the tourism score, the best time of year to visit Ovar Mil. for warm-weather activities is from mid June to early September.

The warm season lasts for 3.4 months, from June 14 to September 26, with an average daily high temperature above 71°F. The hottest month of the year at Ovar Mil. is August, with an average high of 74°F and low of 58°F.

The cool season lasts for 3.4 months, from November 23 to March 4, with an average daily high temperature below 60°F. The coldest month of the year at Ovar Mil. is January, with an average low of 42°F and high of 57°F.

At Ovar Mil., the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year at Ovar Mil. begins around June 8 and lasts for 3.1 months, ending around September 12.

The clearest month of the year at Ovar Mil. is July, during which on average the sky is clear, mostly clear, or partly cloudy 84% of the time.

The cloudier part of the year begins around September 12 and lasts for 8.9 months, ending around June 8.

The cloudiest month of the year at Ovar Mil. is December, during which on average the sky is overcast or mostly cloudy 55% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Ovar Mil. varies significantly throughout the year.

The wetter season lasts 8.2 months, from September 23 to May 28, with a greater than 21% chance of a given day being a wet day. The month with the most wet days at Ovar Mil. is November, with an average of 10.5 days with at least 0.04 inches of precipitation.

The drier season lasts 3.8 months, from May 28 to September 23. The month with the fewest wet days at Ovar Mil. is July, with an average of 1.6 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone at Ovar Mil. is November, with an average of 10.5 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 38% on October 28.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Ovar Mil. experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year at Ovar Mil.. The month with the most rain at Ovar Mil. is December, with an average rainfall of 4.9 inches.

The month with the least rain at Ovar Mil. is July, with an average rainfall of 0.4 inches.

The length of the day at Ovar Mil. varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 14 minutes of daylight; the longest day is June 20, with 15 hours, 7 minutes of daylight.

The earliest sunrise is at 6:02 AM on June 13, and the latest sunrise is 1 hour, 57 minutes later at 7:59 AM on January 5. The earliest sunset is at 5:06 PM on December 7, and the latest sunset is 4 hours, 4 minutes later at 9:10 PM on June 27.

Daylight saving time (DST) is observed at Ovar Mil. during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27.

The figure below presents a compact representation of key lunar data for 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.

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 perceived humidity level at Ovar Mil., as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 4% of 4% throughout.

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 at Ovar Mil. experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.5 months, from October 21 to May 5, with average wind speeds of more than 7.0 miles per hour. The windiest month of the year at Ovar Mil. is December, with an average hourly wind speed of 8.0 miles per hour.

The calmer time of year lasts for 5.5 months, from May 5 to October 21. The calmest month of the year at Ovar Mil. is September, with an average hourly wind speed of 6.1 miles per hour.

The predominant average hourly wind direction at Ovar Mil. varies throughout the year.

The wind is most often from the east for 1.0 months, from January 10 to February 11 and for 1.7 months, from November 5 to December 27, with a peak percentage of 35% on December 16. The wind is most often from the north for 8.2 months, from February 11 to October 17, with a peak percentage of 57% on July 23. The wind is most often from the south for 2.7 weeks, from October 17 to November 5 and for 2.0 weeks, from December 27 to January 10, with a peak percentage of 30% on October 28.

Ovar Mil. 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 4.2 months, from June 14 to October 20, with an average temperature above 63°F. The month of the year at Ovar Mil. with the warmest water is August, with an average temperature of 64°F.

The time of year with cooler water lasts for 3.5 months, from December 29 to April 13, with an average temperature below 58°F. The month of the year at Ovar Mil. with the coolest water is February, with an average temperature of 56°F.

To characterize how pleasant the weather is at Ovar Mil. throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Ovar Mil. for general outdoor tourist activities is from mid June to early September, with a peak score in the third week of July.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Ovar Mil. for hot-weather activities is from mid July to late August, with a peak score in the last week of July.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 at Ovar Mil. typically lasts for 10 months (316 days), from around February 7 to around December 20, rarely starting after March 11, or ending before November 20.

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.

Based on growing degree days alone, the first spring blooms at Ovar Mil. should appear around February 8, only rarely appearing before January 26 or after February 26.

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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.1 months, from May 16 to August 20, with an average daily incident shortwave energy per square meter above 6.7 kWh. The brightest month of the year at Ovar Mil. is July, with an average of 7.8 kWh.

The darker period of the year lasts for 3.7 months, from October 24 to February 14, with an average daily incident shortwave energy per square meter below 2.9 kWh. The darkest month of the year at Ovar Mil. is December, with an average of 1.8 kWh.