This report describes the typical weather at the Santiago de Compostela Airport (Santiago de Compostela, Spain) weather station over the course of an average April. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Santiago de Compostela has a mild humid temperate climate with warm summers and no dry season. The area within 25 mi of this station is covered by grasslands (99%).
The month of April is characterized by gradually rising daily high temperatures, with daily highs around 60°F throughout the month, exceeding 73°F or dropping below 49°F only one day in ten.
Over the course of April, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:20 hours, implying an average day-over-day increase of 2.7 minutes.
The shortest day of the month is April 1 with 12:45 hours of daylight; the longest day is April 30 with 14:05 hours of daylight.
The earliest sunrise is at 7:29am on April 30; the latest sunset is at 9:34pm on April 30; the latest sunrise is at 8:15am on April 1; the earliest sunset is at 9:00pm on April 1.
Daylight saving time is observed in 2012 but it neither starts nor ends in April, so the entire month is in daylight time.
The median cloud cover is 68% (partly cloudy) and does not vary substantially over the course of the month.
On April 15, a representative day, the sky is clear or mostly clear 19% of the time, partly cloudy 30% of the time, and mostly cloudy or overcast 33% of the time.
The average probability that some form of precipitation will be observed in a given day is 59%, with little variation over the course of the month.
Throughout April, the most common forms of precipitation are moderate rain, light rain, and drizzle.
Moderate rain is the most severe precipitation observed during 60% of those days with precipitation. It is most likely around April 19, when it is observed during 36% of all days.
Light rain is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around April 14, when it is observed during 9% of all days.
Drizzle is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around April 13, when it is observed during 7% of all days.
The likelihood of snow falling is highest around April 1, occurring in 2% of days.
Either snow rarely accumulates at this location in April or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 56% (mildly humid) to 97% (very humid) over the course of a typical April, rarely dropping below 34% (comfortable) and reaching as high as 100% (very humid).
The air is driest around April 23, at which time the relative humidity drops below 68% (mildly humid) three days out of four; it is most humid around April 22, rising above 97% (very humid) three days out of four.
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 April, the dew point typically varies from 38°F (dry) to 50°F (very comfortable) and is rarely below 31°F (dry) or above 56°F (comfortable).
Over the course of April typical wind speeds vary from 1 mph to 14 mph (light air to moderate breeze), rarely exceeding 21 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around April 2, at which time the average daily maximum wind speed is 14 mph (moderate breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around April 28, at which time the average daily maximum wind speed is 14 mph (moderate breeze).