This report describes the typical weather at the Riga International Airport (Riga, Latvia) weather station over the course of an average May. 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 May is characterized by rising daily high temperatures, with daily highs increasing from 60Â°F to 67Â°F over the course of the month, exceeding 78Â°F or dropping below 48Â°F only one day in ten.
Over the course of May, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1:51 hours, implying an average day-over-day increase of 3.6 minutes.
The shortest day of the month is May 1 with 15:32 hours of daylight; the longest day is May 31 with 17:24 hours of daylight.
The earliest sunrise is at 4:41am on May 30; the latest sunset is at 10:05pm on May 31; the latest sunrise is at 5:36am on May 1; the earliest sunset is at 9:08pm on May 1.
Daylight savings time is observed in 2012 but it neither starts nor ends in May, so the entire month is in daylight time.
The median cloud cover is 90% (mostly cloudy) and does not vary substantially over the course of the month.
On May 16, a representative day, the sky is clear or mostly clear 4% of the time, partly cloudy 10% of the time, and mostly cloudy or overcast 38% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around May 29, occurring in 50% of days. Precipitation is least likely around May 11, occurring in 44% of days.
Throughout May, the most common forms of precipitation are light rain and thunderstorms.
Light rain is the most severe precipitation observed during 62% of those days with precipitation. It is most likely around May 5, when it is observed during 30% of all days.
Thunderstorms are the most severe precipitation observed during 24% of those days with precipitation. They are most likely around May 31, when it is observed during 16% of all days.
The likelihood of snow falling is highest around May 1, occurring in 6% of days.
Either snow rarely accumulates at this location in May or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 45% (comfortable) to 94% (very humid) over the course of a typical May, rarely dropping below 28% (dry) and reaching as high as 100% (very humid).
The air is driest around May 2, at which time the relative humidity drops below 52% (mildly humid) three days out of four; it is most humid around May 23, rising above 91% (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 May, the dew point typically varies from 33Â°F (dry) to 53Â°F (very comfortable) and is rarely below 23Â°F (dry) or above 61Â°F (comfortable).
Over the course of May typical wind speeds vary from 1 mph to 14 mph (calm to moderate breeze), rarely exceeding 19 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around May 7, at which time the average daily maximum wind speed is 14 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around May 31, at which time the average daily maximum wind speed is 13 mph (moderate breeze).