April Weather at Visby Airport Sweden

Daily high temperatures increase by 10°F, from 43°F to 53°F, rarely falling below 35°F or exceeding 64°F.

Daily low temperatures increase by 6°F, from 31°F to 38°F, rarely falling below 24°F or exceeding 44°F.

For reference, on July 23, the hottest day of the year, temperatures at Visby Airport typically range from 56°F to 70°F, while on February 11, the coldest day of the year, they range from 27°F to 34°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Kitimat, Canada (4,505 miles away) and Yarmouth, Canada (3,563 miles) are the far-away foreign places with temperatures most similar to Visby Airport (view comparison).

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The month of April at Visby Airport experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 59% to 51%.

The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 49% of the time.

For reference, on January 18, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 69%, while on July 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 59%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Visby Airport, the chance of a wet day over the course of April is essentially constant, remaining around 18% throughout.

For reference, the year's highest daily chance of a wet day is 32% on November 14, and its lowest chance is 17% on April 16.

Over the course of April at Visby Airport, the chance of a day with only rain increases from 15% to 17%, the chance of a day with mixed snow and rain remains an essentially constant 2% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during April at Visby Airport is essentially constant, remaining about 1.0 inches throughout, and rarely exceeding 2.2 inches or falling below 0.2 inches.

Over the course of April at Visby Airport, the length of the day is very rapidly increasing. From the start to the end of the month, the length of the day increases by 2 hours, 21 minutes, implying an average daily increase of 4 minutes, 51 seconds, and weekly increase of 33 minutes, 59 seconds.

The shortest day of the month is April 1, with 13 hours, 14 minutes of daylight and the longest day is April 30, with 15 hours, 35 minutes of daylight.

The latest sunrise of the month at Visby Airport is 6:14 AM on April 1 and the earliest sunrise is 1 hour, 17 minutes earlier at 4:57 AM on April 30.

The earliest sunset is 7:27 PM on April 1 and the latest sunset is 1 hour, 4 minutes later at 8:31 PM on April 30.

Daylight saving time is observed at Visby Airport during 2024, but it neither starts nor ends during April, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 3:45 AM and sets 18 hours, 5 minutes later, at 9:50 PM, while on December 21, the shortest day of the year, it rises at 8:28 AM and sets 6 hours, 33 minutes later, at 3:01 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for April 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy at Visby Airport is essentially constant during April, remaining around 0% throughout.

For reference, on July 31, the muggiest day of the year, there are muggy conditions 3% of the time, while on October 2, the least muggy day of the year, there are muggy conditions 0% of the time.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Visby Airport is decreasing during April, decreasing from 10.2 miles per hour to 8.6 miles per hour over the course of the month.

For reference, on January 6, the windiest day of the year, the daily average wind speed is 14.3 miles per hour, while on May 22, the calmest day of the year, the daily average wind speed is 8.2 miles per hour.

The hourly average wind direction at Visby Airport throughout April is predominantly from the south, with a peak proportion of 33% on April 26.

Visby Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature at Visby Airport is increasing during April, rising by 4°F, from 37°F to 41°F, over the course of the month.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season at Visby Airport typically lasts for 5.5 months (169 days), from around May 2 to around October 18, rarely starting before April 12 or after May 21, and rarely ending before September 26 or after November 15.

The month of April at Visby Airport is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly increasing from 2% to 45% over the course of the month.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days at Visby Airport are essentially constant during April, remaining within 10°F of 12°F throughout.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy at Visby Airport is rapidly increasing during April, rising by 1.7 kWh, from 3.4 kWh to 5.1 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Visby Airport are 57.663 deg latitude, 18.346 deg longitude, and 135 ft elevation.

The topography within 2 miles of Visby Airport contains only modest variations in elevation, with a maximum elevation change of 243 feet and an average elevation above sea level of 114 feet. Within 10 miles also contains only modest variations in elevation (285 feet). Within 50 miles also contains only modest variations in elevation (453 feet).

The area within 2 miles of Visby Airport is covered by trees (30%), artificial surfaces (24%), water (22%), and cropland (17%), within 10 miles by water (41%) and trees (27%), and within 50 miles by water (85%).