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A high-pressure system positioned over the UK is responsible for maintaining above-average temperatures and spring sunshine over the coming days. While England and Wales experienced their warmest temperatures earlier in the week on Wednesday, Thursday brought the highest temperatures so far this year to Scotland and Northern Ireland. There is also potential for Friday to surpass these recent warmth records. However, despite the bright and warm daytime conditions, clear skies have led to significant drops in temperature overnight.
Some areas, particularly across the Midlands and southern England, witnessed a striking temperature difference between day and night of around 21°C following Wednesday’s warm weather. Frost greeted many locations during the early mornings of Thursday, with similar cold starts expected on both Friday and Saturday. This considerable variation between daytime warmth and overnight chill is an effect commonly observed as spring unfolds.
Wednesday’s mild conditions marked the warmest day of the year for many parts of England and Wales, only for temperatures to sharply fall by dawn, producing frosty ground cover. For example, South Newington in Oxfordshire recorded 19°C during the day but plummeted to -2.4°C overnight. Similarly, Woburn in Bedfordshire reached 19.4°C but fell to -1.6°C by morning. This phenomenon, known as the diurnal temperature range, represents the gap between the highest and lowest temperatures within a 24-hour period. The afternoons tend to be the warmest as the sun heats the land and air, while the coldest point generally occurs just before sunrise when the ground has lost heat throughout the night.
The pronounced temperature swings during early spring arise from several factors working together. As March and April bring a higher sun and longer days, more solar energy reaches the surface, resulting in warmer afternoons. However, after winter, the ground and atmosphere near the surface remain cold, enabling rapid cooling on clear nights under high-pressure conditions. Nights remain longer than days until the spring equilux, so mornings can still be chilly. Additionally, dry air heats and cools more quickly than humid air, increasing the temperature differences. These combined influences, along with settled weather and light winds, make early spring particularly prone to wide daily temperature fluctuations
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