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.

Daily High and Low Temperature in July

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The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Fraction of Time Spent in Various Temperature Bands in July

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The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).

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.

Daily Hours of Daylight and Twilight in July

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The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.

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.

Daily Sunrise & Sunset with Twilight in July

The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The median cloud cover is 92% (mostly cloudy) and does not vary substantially over the course of the month.

Median Cloud Cover in July

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The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

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.

Cloud Cover Types in July

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

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.

Probability of Precipitation at Some Point in the Day in July

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The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

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.

Types of Precipitation Throughout July

Relative frequency of various types of precipitation over the course of a typical July.

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.

Relative Humidity in July

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The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

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.

Dew Point in July

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The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

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).

Wind Speed in July

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The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind Directions in July

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions in July

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.