This report describes the typical weather at the Belgrade Nikola Tesla International Airport (Belgrade, Serbia) weather station over the course of an average April. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.

Belgrade has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by croplands (91%), built-up areas (3%), and lakes and rivers (3%).

The month of April is characterized by rising daily high temperatures, with daily highs increasing from 60°F to 68°F over the course of the month, exceeding 78°F or dropping below 48°F only one day in ten.

Daily High and Low Temperature in April

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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 April

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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 April, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:26 hours, implying an average day-over-day increase of 2.9 minutes.

The shortest day of the month is April 1 with 12:48 hours of daylight; the longest day is April 30 with 14:14 hours of daylight.

Daily Hours of Daylight and Twilight in April

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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 5:30am on April 30; the latest sunset is at 7:43pm on April 30; the latest sunrise is at 6:19am on April 1; the earliest sunset is at 7:06pm on April 1.

Daylight savings time is observed in 2012 but it neither starts nor ends in April, so the entire month is in daylight time.

Daily Sunrise & Sunset with Twilight and Daylight Savings Time in April

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 transitions to and from daylight savings time are indicated by the "DST" labels.

The median cloud cover is 58% (partly cloudy) and does not vary substantially over the course of the month.

Median Cloud Cover in April

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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 April 15, a representative day, the sky is clear or mostly clear 30% of the time, partly cloudy 23% of the time, and mostly cloudy or overcast 30% of the time.

Cloud Cover Types in April

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 probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around April 30, occurring in 52% of days. Precipitation is least likely around April 5, occurring in 48% of days.

Probability of Precipitation at Some Point in the Day in April

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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 April, the most common forms of precipitation are moderate rain, light rain, and thunderstorms.

Moderate rain is the most severe precipitation observed during 47% of those days with precipitation. It is most likely around April 15, when it is observed during 24% of all days.

Light rain is the most severe precipitation observed during 24% of those days with precipitation. It is most likely around April 2, when it is observed during 12% of all days.

Thunderstorms are the most severe precipitation observed during 22% of those days with precipitation. They are most likely around April 30, when it is observed during 16% of all days.

Types of Precipitation Throughout April

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

The likelihood of snow falling is highest around April 1, occurring in 7% of days.

Probability of Snow Fall Being Reported in a Given Day in April

Probability that snow will be reported at least once in a given day.

Either snow rarely accumulates at this location in April or snow depth measurements are unavailable or unreliable.

The relative humidity typically ranges from 46% (comfortable) to 90% (very humid) over the course of a typical April, rarely dropping below 27% (dry) and reaching as high as 100% (very humid).

The air is driest around April 1, at which time the relative humidity drops below 55% (mildly humid) three days out of four; it is most humid around April 19, rising above 86% (very humid) three days out of four.

Relative Humidity in April

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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 April, the dew point typically varies from 34°F (dry) to 51°F (very comfortable) and is rarely below 25°F (dry) or above 57°F (comfortable).

Dew Point in April

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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 April typical wind speeds vary from 2 mph to 15 mph (light air to moderate breeze), rarely exceeding 23 mph (fresh breeze).

The highest average wind speed of 9 mph (gentle breeze) occurs around April 3, at which time the average daily maximum wind speed is 15 mph (moderate breeze).

The lowest average wind speed of 8 mph (gentle breeze) occurs around April 30, at which time the average daily maximum wind speed is 14 mph (moderate breeze).

Wind Speed in April

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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 April

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 April

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.