This report describes the typical weather at the Pulkovo Airport (Saint Petersburg, Russian Federation) weather station over the course of an average August. It is based on the historical records from 2006 to 2012. Earlier records are either unavailable or unreliable.
Saint Petersburg has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by forests (54%), croplands (21%), oceans and seas (14%), and built-up areas (8%).
The month of August is characterized by rapidly falling daily high temperatures, with daily highs decreasing from 74°F to 65°F over the course of the month, exceeding 83°F or dropping below 59°F only one day in ten.
Over the course of August, 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 2:36 hours, implying an average day-over-day decrease of 5.0 minutes.
The shortest day of the month is August 31 with 14:12 hours of daylight; the longest day is August 1 with 16:48 hours of daylight.
The earliest sunrise is at 5:40am on August 1; the latest sunset is at 10:29pm on August 1; the latest sunrise is at 6:52am on August 31; the earliest sunset is at 9:04pm on August 31.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 94% (mostly cloudy) and does not vary substantially over the course of the month.
On August 16, a representative day, the sky is clear or mostly clear 2% of the time, partly cloudy 6% of the time, and mostly cloudy or overcast 60% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around August 23, occurring in 57% of days. Precipitation is least likely around August 1, occurring in 52% of days.
Throughout August, the most common forms of precipitation are light rain and thunderstorms.
Light rain is the most severe precipitation observed during 80% of those days with precipitation. It is most likely around August 31, when it is observed during 48% of all days.
Thunderstorms are the most severe precipitation observed during 17% of those days with precipitation. They are most likely around August 5, when it is observed during 12% of all days.
Either snow is exceptionally unlikely to fall at this location in August or this station does not reliably report precipitation types.
The relative humidity typically ranges from 49% (comfortable) to 95% (very humid) over the course of a typical August, rarely dropping below 37% (comfortable) and reaching as high as 99% (very humid).
The air is driest around August 2, at which time the relative humidity drops below 56% (mildly humid) three days out of four; it is most humid around August 30, rising above 93% (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 August, the dew point typically varies from 48°F (dry) to 60°F (comfortable) and is rarely below 43°F (dry) or above 65°F (muggy).
The time of the month between August 1 and August 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of August typical wind speeds vary from 1 mph to 8 mph (calm to gentle breeze), rarely exceeding 14 mph (moderate breeze).
The highest average wind speed of 5 mph (light breeze) occurs around August 25, at which time the average daily maximum wind speed is 8 mph (gentle breeze).
The lowest average wind speed of 4 mph (light breeze) occurs around August 3, at which time the average daily maximum wind speed is 7 mph (light breeze).