This report describes the typical weather at the Pulkovo Airport (Saint Petersburg, Russian Federation) weather station over the course of an average July. 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 July is characterized by essentially constant daily high temperatures, with daily highs around 75°F throughout the month, exceeding 85°F or dropping below 66°F only one day in ten.
Over the course of July, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1:47 hours, implying an average day-over-day decrease of 3.5 minutes.
The shortest day of the month is July 31 with 16:54 hours of daylight; the longest day is July 1 with 18:41 hours of daylight.
The earliest sunrise is at 4:42am on July 1; the latest sunset is at 11:23pm on July 2; the latest sunrise is at 5:38am on July 31; the earliest sunset is at 10:32pm on July 31.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 92% (mostly cloudy) and does not vary substantially over the course of the month.
On July 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 50% of the time.
The average probability that some form of precipitation will be observed in a given day is 51%, with little variation over the course of the month.
Throughout July, the most common forms of precipitation are light rain and thunderstorms.
Light rain is the most severe precipitation observed during 77% of those days with precipitation. It is most likely around July 5, when it is observed during 42% of all days.
Thunderstorms are the most severe precipitation observed during 21% of those days with precipitation. They are most likely around July 27, when it is observed during 12% of all days.
Either snow is exceptionally unlikely to fall at this location in July or this station does not reliably report precipitation types.
The relative humidity typically ranges from 48% (comfortable) to 94% (very humid) over the course of a typical July, rarely dropping below 36% (comfortable) and reaching as high as 99% (very humid).
The air is driest around July 2, at which time the relative humidity drops below 55% (mildly humid) three days out of four; it is most humid around July 28, 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 July, the dew point typically varies from 49°F (dry) to 62°F (mildy humid) and is rarely below 43°F (dry) or above 67°F (muggy).
The time of the month between July 1 and July 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of July typical wind speeds vary from 0 mph to 8 mph (calm to light breeze), rarely exceeding 13 mph (moderate breeze).
The highest average wind speed of 5 mph (light breeze) occurs around July 22, at which time the average daily maximum wind speed is 8 mph (light breeze).
The lowest average wind speed of 4 mph (light breeze) occurs around July 8, at which time the average daily maximum wind speed is 7 mph (light breeze).