This report describes the typical weather at the Riga International Airport (Riga, Latvia) weather station over the course of an average October. 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 October is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 58Â°F to 46Â°F over the course of the month, exceeding 65Â°F or dropping below 38Â°F only one day in ten.
Over the course of October, the length of the day is very rapidly decreasing. From the start to the end of the month, the length of the day decreases by 2:20 hours, implying an average day-over-day decrease of 4.5 minutes.
The shortest day of the month is October 31 with 9:10 hours of daylight; the longest day is October 1 with 11:30 hours of daylight.
The earliest sunrise is at 7:27am on October 28; the latest sunset is at 6:58pm on October 1; the latest sunrise is at 8:24am on October 27; the earliest sunset is at 4:42pm on October 31.
Daylight savings time (DST) ends at 3:00am on October 28, 2012, shifting sunrise and sunset to an hour earlier.
The median cloud cover is 95% (overcast) and does not vary substantially over the course of the month.
On October 16, a representative day, the sky is clear or mostly clear 5% of the time, partly cloudy 8% of the time, and mostly cloudy or overcast 67% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around October 28, occurring in 67% of days. Precipitation is least likely around October 1, occurring in 58% of days.
Throughout October, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 61% of those days with precipitation. It is most likely around October 3, when it is observed during 38% of all days.
Moderate rain is the most severe precipitation observed during 13% of those days with precipitation. It is most likely around October 3, when it is observed during 10% of all days.
The likelihood of snow falling is highest around October 31, occurring in 18% of days.
Either snow rarely accumulates at this location in October or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 64% (mildly humid) to 97% (very humid) over the course of a typical October, rarely dropping below 49% (comfortable) and reaching as high as 100% (very humid).
The air is driest around October 1, at which time the relative humidity drops below 73% (humid) three days out of four; it is most humid around October 16, rising above 96% (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 October, the dew point typically varies from 33Â°F (dry) to 50Â°F (very comfortable) and is rarely below 23Â°F (dry) or above 57Â°F (comfortable).
Over the course of October typical wind speeds vary from 2 mph to 13 mph (light air to moderate breeze), rarely exceeding 19 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around October 28, 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 October 1, at which time the average daily maximum wind speed is 12 mph (gentle breeze).