This report describes the typical weather at the Riga International Airport (Riga, Latvia) weather station over the course of an average April. It is based on the historical records from 1995 to 2012. Earlier records are either unavailable or unreliable.
Riga has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by croplands (43%), oceans and seas (26%), forests (15%), grasslands (10%), and built-up areas (3%).
The month of April is characterized by rapidly rising daily high temperatures, with daily highs increasing from 46Â°F to 60Â°F over the course of the month, exceeding 73Â°F or dropping below 37Â°F only one day in ten.
Over the course of April, the length of the day is very rapidly increasing. From the start to the end of the month, the length of the day increases by 2:15 hours, implying an average day-over-day increase of 4.5 minutes.
The shortest day of the month is April 1 with 13:12 hours of daylight; the longest day is April 30 with 15:27 hours of daylight.
The earliest sunrise is at 5:39am on April 30; the latest sunset is at 9:05pm on April 30; the latest sunrise is at 6:53am on April 1; the earliest sunset is at 8:04pm on April 1.
Daylight savings 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 94% (mostly 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 4% of the time, partly cloudy 7% of the time, and mostly cloudy or overcast 43% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around April 1, occurring in 51% of days. Precipitation is least likely around April 29, occurring in 46% of days.
Throughout April, the most common forms of precipitation are light rain, moderate snow, and light snow.
Light rain is the most severe precipitation observed during 53% of those days with precipitation. It is most likely around April 30, when it is observed during 30% of all days.
Moderate snow is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around April 1, when it is observed during 14% of all days.
Light snow is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around April 1, when it is observed during 12% of all days.
The likelihood of snow falling is highest around April 1, occurring in 27% 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 45% (comfortable) to 95% (very humid) over the course of a typical April, rarely dropping below 28% (dry) and reaching as high as 100% (very humid).
The air is driest around April 28, at which time the relative humidity drops below 52% (mildly humid) three days out of four; it is most humid around April 7, rising above 92% (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 25Â°F (dry) to 44Â°F (dry) and is rarely below 14Â°F (dry) or above 53Â°F (very comfortable).
Over the course of April typical wind speeds vary from 0 mph to 14 mph (calm to moderate breeze), rarely exceeding 20 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 13 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around April 23, at which time the average daily maximum wind speed is 13 mph (moderate breeze).