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Average Weather at Montijo Air Base Portugal

At Montijo Air Base, the summers are warm, dry, and mostly clear and the winters are cold, wet, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 46°F to 85°F and is rarely below 38°F or above 95°F.

The warm season lasts for 3.1 months, from June 17 to September 21, with an average daily high temperature above 79°F. The hottest day of the year is July 29, with an average high of 85°F and low of 65°F.

The cool season lasts for 3.6 months, from November 19 to March 6, with an average daily high temperature below 63°F. The coldest day of the year is January 18, with an average low of 46°F and high of 58°F.

Average High and Low Temperature

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 entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature at Montijo Air BaseJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMcoldcoolwarmcomfortable
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

At Montijo Air Base, 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 Montijo Air Base begins around June 2 and lasts for 3.4 months, ending around September 14. On July 20, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 92% of the time, and overcast or mostly cloudy 8% of the time.

The cloudier part of the year begins around September 14 and lasts for 8.6 months, ending around June 2. On December 16, the cloudiest day of the year, the sky is overcast or mostly cloudy 50% of the time, and clear, mostly clear, or partly cloudy 50% of the time.

Cloud Cover Categories

Cloud Cover Categories at Montijo Air BaseclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 2092%Jul 2092%Dec 1650%Dec 1650%Jun 270%Jun 270%Sep 1471%Sep 1471%clearovercastmostly clearpartly cloudymostly cloudy
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 7.8 months, from September 27 to May 21, with a greater than 16% chance of a given day being a wet day. The chance of a wet day peaks at 29% on October 31.

The drier season lasts 4.2 months, from May 21 to September 27. The smallest chance of a wet day is 1% on July 31.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 29% on October 31.

Daily Chance of Precipitation

Daily Chance of Precipitation at Montijo Air BasewetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Oct 3129%Oct 3129%Jul 311%Jul 311%Jan 127%Jan 127%Sep 2716%Sep 2716%May 2116%May 2116%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 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. Montijo Air Base experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.2 months, from September 4 to June 11, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around November 6, with an average total accumulation of 3.2 inches.

The rainless period of the year lasts for 2.8 months, from June 11 to September 4. The least rain falls around July 28, with an average total accumulation of 0.1 inches.

Average Monthly Rainfall

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 liquid-equivalent snowfall.

Sun

The length of the day at Montijo Air Base varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 27 minutes of daylight; the longest day is June 21, with 14 hours, 53 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Montijo Air BaseJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 6 minMar 2012 hr, 6 minMar 2014 hr, 53 minJun 2114 hr, 53 minJun 2112 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 27 minDec 219 hr, 27 minDec 21nightnightday
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 earliest sunrise is at 6:10 AM on June 14, and the latest sunrise is 1 hour, 48 minutes later at 7:58 AM on October 28. The earliest sunset is at 5:14 PM on December 7, and the latest sunset is 3 hours, 51 minutes later at 9:04 PM on June 27.

Daylight saving time (DST) is observed at Montijo Air Base during 2017, starting in the spring on March 26, lasting 7.1 months, and ending in the fall on October 29.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time at Montijo Air BaseJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 146:10 AMJun 146:10 AM9:04 PMJun 279:04 PMJun 27Dec 75:14 PMDec 75:14 PM7:58 AMOct 287:58 AMOct 28Mar 26DSTMar 26DSTDSTOct 29DSTOct 29daynightnightnightnight
The solar day over the course of the year 2017. 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 transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

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.

Montijo Air Base experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 5.1 months, from June 4 to November 6, during which time the comfort level is muggy, oppressive, or miserable at least 4% of the time. The muggiest day of the year is August 16, with muggy conditions 16% of the time.

The least muggy day of the year is January 23, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels at Montijo Air BasemuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 230%Jan 230%Aug 1616%Aug 1616%Jun 44%Jun 44%Nov 64%Nov 64%muggymuggyhumidhumiddrydrycomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Montijo Air Base experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 9.7 months, from October 30 to August 20, with average wind speeds of more than 5.6 miles per hour. The windiest day of the year is December 15, with an average hourly wind speed of 6.2 miles per hour.

The calmer time of year lasts for 2.3 months, from August 20 to October 30. The calmest day of the year is September 17, with an average hourly wind speed of 5.1 miles per hour.

Average Wind Speed

Average Wind Speed at Montijo Air BasewindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mphDec 156.2 mphDec 156.2 mphSep 175.1 mphSep 175.1 mphOct 305.6 mphOct 305.6 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Montijo Air Base varies throughout the year.

The wind is most often from the north for 11 months, from January 8 to December 7, with a peak percentage of 72% on July 22. The wind is most often from the east for 1.0 months, from December 7 to January 8, with a peak percentage of 30% on January 1.

Wind Direction

Wind Direction at Montijo Air BaseNEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%northeastwestsouth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Montijo Air Base 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 3.9 months, from June 28 to October 24, with an average temperature above 65°F. The day of the year with the warmest water is August 25, with an average temperature of 66°F.

The time of year with cooler water lasts for 3.7 months, from January 2 to April 22, with an average temperature below 60°F. The day of the year with the coolest water is February 21, with an average temperature of 58°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 3.3 months, from May 12 to August 22, with an average daily incident shortwave energy per square meter above 6.9 kWh. The brightest day of the year is July 2, with an average of 8.2 kWh.

The darker period of the year lasts for 3.5 months, from October 26 to February 13, with an average daily incident shortwave energy per square meter below 3.3 kWh. The darkest day of the year is December 16, with an average of 2.1 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Montijo Air BasebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJul 28.2 kWhJul 28.2 kWhDec 162.1 kWhDec 162.1 kWhMay 127.0 kWhMay 127.0 kWhAug 226.9 kWhAug 226.9 kWhOct 263.3 kWhOct 263.3 kWhFeb 133.3 kWhFeb 133.3 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.

Topography

For the purposes of this report, the geographical coordinates of Montijo Air Base are 38.704 deg latitude, -9.036 deg longitude, and 0 ft elevation.

The topography within 2 miles of Montijo Air Base is essentially flat, with a maximum elevation change of 82 feet and an average elevation above sea level of 8 feet. Within 10 miles is essentially flat (748 feet). Within 50 miles contains significant variations in elevation (2,218 feet).

The area within 2 miles of Montijo Air Base is covered by water (58%), artificial surfaces (21%), and trees (12%), within 10 miles by water (32%) and artificial surfaces (31%), and within 50 miles by water (43%) and cropland (26%).

Data Sources

This report illustrates the typical weather at Montijo Air Base, 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

Montijo Air Base has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back are Lisbon Humberto Delgado Airport, Monte Real Mil., and Beja.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.