April Weather at Unst Island United Kingdom

Daily high temperatures increase by 3°F, from 46°F to 49°F, rarely falling below 40°F or exceeding 54°F.

Daily low temperatures increase by 3°F, from 38°F to 41°F, rarely falling below 32°F or exceeding 46°F.

For reference, on August 5, the hottest day of the year, temperatures at Unst Island typically range from 52°F to 59°F, while on February 17, the coldest day of the year, they range from 36°F to 43°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.

Sitka, United States (3,938 miles away) and Stanley, Falkland Islands (8,391 miles) are the far-away foreign places with temperatures most similar to Unst Island (view comparison).

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The month of April at Unst Island experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 64% to 56%.

The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 44% of the time.

For reference, on February 26, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 71%, while on May 30, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 47%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Unst Island, the chance of a wet day over the course of April is very rapidly decreasing, starting the month at 35% and ending it at 27%.

For reference, the year's highest daily chance of a wet day is 52% on December 30, and its lowest chance is 22% on June 8.

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 Unst Island is decreasing, starting the month at 2.2 inches, when it rarely exceeds 3.3 inches or falls below 1.2 inches, and ending the month at 1.6 inches, when it rarely exceeds 2.5 inches or falls below 0.8 inches.

Over the course of April at Unst Island, 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, 42 minutes, implying an average daily increase of 5 minutes, 34 seconds, and weekly increase of 39 minutes, 0 seconds.

The shortest day of the month is April 1, with 13 hours, 23 minutes of daylight and the longest day is April 30, with 16 hours, 5 minutes of daylight.

The latest sunrise of the month at Unst Island is 6:26 AM on April 1 and the earliest sunrise is 1 hour, 27 minutes earlier at 4:58 AM on April 30.

The earliest sunset is 7:49 PM on April 1 and the latest sunset is 1 hour, 14 minutes later at 9:03 PM on April 30.

Daylight saving time is observed at Unst Island 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 3:30 AM and sets 19 hours, 10 minutes later, at 10:39 PM, while on December 21, the shortest day of the year, it rises at 9:12 AM and sets 5 hours, 37 minutes later, at 2:50 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 Unst Island is essentially constant during April, remaining around 0% throughout.

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 Unst Island is rapidly decreasing during April, decreasing from 19.3 miles per hour to 16.5 miles per hour over the course of the month.

For reference, on January 23, the windiest day of the year, the daily average wind speed is 23.7 miles per hour, while on July 12, the calmest day of the year, the daily average wind speed is 13.5 miles per hour.

The hourly average wind direction at Unst Island throughout April is predominantly from the south, with a peak proportion of 33% on April 12.

Unst Island 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 Unst Island is essentially constant during April, remaining around 46°F throughout.

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 Unst Island typically lasts for 7.0 months (215 days), from around April 14 to around November 15, rarely starting before March 21 or after May 8, and rarely ending before October 19 or after December 26.

During April at Unst Island, the chance that a given day is within the growing season is very rapidly increasing rising from 24% to 80% 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 Unst Island are essentially constant during April, remaining within 2°F of 2°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 Unst Island is rapidly increasing during April, rising by 1.8 kWh, from 2.6 kWh to 4.4 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Unst Island are 60.733 deg latitude, -0.817 deg longitude, and 0 ft elevation.

The topography within 2 miles of Unst Island contains only modest variations in elevation, with a maximum elevation change of 328 feet and an average elevation above sea level of 39 feet. Within 10 miles contains only modest variations in elevation (919 feet). Within 50 miles also contains very significant variations in elevation (1,444 feet).

The area within 2 miles of Unst Island is covered by water (69%), shrubs (14%), and grassland (11%), within 10 miles by water (74%), and within 50 miles by water (93%).