Average Weather In May For Porto Santo Island, Portugal

Location

This report describes the typical weather at the Porto Santo Airport (Porto Santo Island, Portugal) weather station over the course of an average May. It is based on the historical records from 1990 to 2012. Earlier records are either unavailable or unreliable.

Porto Santo Island has a mediterranean climate with dry hot summers and mild winters. The area within 25 mi of this station is covered by oceans and seas (100%).

Temperature

The month of May is characterized by gradually rising daily high temperatures, with daily highs around 69°F throughout the month, exceeding 73°F or dropping below 65°F only one day in ten.

Daily High and Low Temperature in May

The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
Daily low temperatures are around 61°F, falling below 57°F or exceeding 65°F only one day in ten.

Fraction of Time Spent in Various Temperature Bands in May

The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).

Sun

Over the course of May, the length of the day is gradually increasing. The shortest day of the month is May 1 with 13:31 hours of daylight; the longest day is May 31 with 14:12 hours of daylight.

Daily Hours of Daylight and Twilight in May

The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.

The earliest sunrise is at 6:58am on May 31; the latest sunset is at 9:09pm on May 31; the latest sunrise is at 7:17am on May 1; the earliest sunset is at 8:48pm on May 1.

Daylight saving time is observed in 2012 but it neither starts nor ends in May, so the entire month is in daylight time.

Daily Sunrise & Sunset with Twilight and Daylight Saving Time in May

The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, 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.

Clouds

The median cloud cover is 49% (partly cloudy) and does not vary substantially over the course of the month.

Median Cloud Cover in May

The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

On May 16, a representative day, the sky is clear or mostly clear 38% of the time, partly cloudy 37% of the time, and mostly cloudy or overcast 24% of the time.

Cloud Cover Types in May

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

The average probability that some form of precipitation will be observed in a given day is 23%, with little variation over the course of the month.

Probability of Precipitation at Some Point in the Day in May

The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

Throughout May, the most common forms of precipitation are moderate rain, drizzle, and light rain.

Moderate rain is the most severe precipitation observed during 50% of those days with precipitation. It is most likely around May 1, when it is observed during 13% of all days.

Drizzle is the most severe precipitation observed during 27% of those days with precipitation. It is most likely around May 26, when it is observed during 7% of all days.

Light rain is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around May 1, when it is observed during 5% of all days.

Types of Precipitation Throughout May

Relative frequency of various types of precipitation over the course of a typical May.

Snow

Either snow is exceptionally unlikely to fall at this location in May or this station does not reliably report precipitation types.

Humidity

The relative humidity typically ranges from 60% (mildly humid) to 91% (very humid) over the course of a typical May, rarely dropping below 50% (comfortable) and reaching as high as 100% (very humid).

The air is driest around May 1, at which time the relative humidity drops below 65% (mildly humid) three days out of four; it is most humid around May 19, rising above 84% (humid) three days out of four.

Relative Humidity in May

The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.

Over the course of a typical May, the dew point typically varies from 50°F (very comfortable) to 60°F (comfortable) and is rarely below 45°F (dry) or above 65°F (mildy humid).

The time of the month between May 1 and May 31 is the most comfortable, with dew points that are neither too dry nor too muggy.

Dew Point in May

The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind

Over the course of May typical wind speeds vary from 5 mph to 16 mph (light breeze to moderate breeze), rarely exceeding 21 mph (fresh breeze).

The highest average wind speed of 11 mph (gentle breeze) occurs around May 1, at which time the average daily maximum wind speed is 16 mph (moderate breeze).

The lowest average wind speed of 10 mph (gentle breeze) occurs around May 17, at which time the average daily maximum wind speed is 15 mph (moderate breeze).

Wind Speed in May

The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
The wind is most often out of the north (31% of the time), north east (20% of the time), east (11% of the time), and north west (10% of the time). The wind is least often out of the south west (3% of the time), south (5% of the time), and south east (5% of the time).

Wind Directions in May

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions in May

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.