In the UK, the meteorological seasons are spring in March, April and May; summer in June, July and August; autumn in September, October and November; and winter in December, January and February. Astronomical seasons begin on the equinoxes and solstices, so their dates shift slightly each year.
UK seasons by month
The simplest month-by-month guide uses the meteorological calendar, which divides the year into four complete, three-month blocks. It is commonly used for weather records and seasonal summaries.
- Spring: March, April and May
- Summer: June, July and August
- Autumn: September, October and November
- Winter: December, January and February
This is a useful convention, not a promise about the weather. A cold spell can continue into spring, while a mild day can occur in winter. The seasons describe broad patterns across the year rather than a precise forecast for any particular date or place.
Meteorological and astronomical seasons
There are two common ways to define the seasons in the UK. Meteorological seasons follow calendar months: spring starts on 1 March, summer on 1 June, autumn on 1 September and winter on 1 December. Because each season consists of whole months, this system is straightforward for climate statistics and everyday explanations.
Astronomical seasons are based on the apparent position of the Sun. In the Northern Hemisphere, spring begins at the March equinox, summer at the June solstice, autumn at the September equinox and winter at the December solstice. These events usually fall around the 20th or 21st of the relevant month, but their exact dates and times vary from year to year. The astronomical season therefore begins partway through a month rather than on its first day.
Neither definition is incorrect. If a calendar, school resource or weather report gives a season by month, it will usually mean the meteorological version. References to an equinox or solstice use the astronomical one.
What the seasons are like in Britain
UK seasons are generally described by changing daylight, temperature and weather, but conditions differ across the country and from year to year. The Atlantic strongly influences British weather, bringing changeable conditions; latitude, elevation, distance from the coast and local geography also matter.
- Spring: Days lengthen, and average temperatures tend to rise. March can still feel wintry, while May is often milder. Rain, wind and occasional late frost remain possible.
- Summer: Days are longest and average temperatures are generally highest. Sunshine can alternate with showers or unsettled weather; heatwaves occur in some years but are not guaranteed.
- Autumn: Daylight decreases and temperatures usually fall. Early autumn can be mild, while later months are often cooler, wetter or windier. Leaves changing colour is a familiar seasonal feature, though timing varies.
- Winter: Days are shortest and temperatures are generally lowest. Frost, snow and ice are possible, but they are not equally frequent everywhere, and many winter days are simply wet, cloudy or mild.
These descriptions are broad averages, not rules. For example, coastal areas often experience different conditions from inland or upland places, and the weather in northern Scotland may differ markedly from that in southern England on the same day.
Why UK season dates can seem confusing
People may give different dates for the start of a season because they are using different definitions. Under the meteorological system, winter starts on 1 December. Astronomically, it starts at the December solstice, usually around 21 December. Both dates can appear in reliable calendars because they answer slightly different questions.
There is also a difference between a season’s formal start and the weather feeling seasonal. A warm day in March does not change the meteorological start of spring, just as a cold spell in September does not make it winter. Seasonal labels are useful for organising the year, but British weather does not switch neatly from one pattern to another at midnight on a boundary date.
Seasons and daylight
Daylight changes noticeably over the course of the year because Earth’s axis is tilted. In the UK, days lengthen between the December and June solstices and shorten between the June and December solstices. The longest day is near the June solstice, while the shortest is near the December solstice.
The change is especially noticeable in spring and autumn. In spring, evenings become lighter; in autumn, daylight fades earlier. The exact sunrise and sunset times depend on the date and location, so a timetable for London will not match one for Edinburgh or Belfast. Clock changes also affect the displayed local time: the UK moves to British Summer Time in spring and returns to Greenwich Mean Time in autumn. These clock changes do not alter the astronomical seasons or the amount of daylight itself.
Using the calendar in practice
For a quick answer, use the meteorological months. They make it easy to compare the same season between years or describe a month without calculating an equinox or solstice. If you are planning a trip, garden work or outdoor event, however, the month alone cannot tell you what conditions to expect.
- Check a local forecast close to your travel or event dates rather than relying on a seasonal label.
- Consider the region and terrain: upland and northern locations can be cooler than lowland and southern areas.
- Expect variation within a season; suitable clothing for changeable conditions is often more useful than assuming a whole month will be consistently warm or cold.
For climate comparisons, check which season definition a source uses. A dataset organised by calendar seasons may group March with spring, while an astronomical account treats the first part of March as winter.
Frequently Asked Questions
What months are the four seasons in the UK?
By the meteorological calendar, spring is March to May, summer is June to August, autumn is September to November, and winter is December to February.
When does summer start in the UK?
Meteorological summer starts on 1 June. Astronomical summer begins at the June solstice, usually around 20 or 21 June.
Is March spring or winter in the UK?
March is spring meteorologically. Astronomical spring begins at the March equinox, usually around 20 March, so the earlier part of the month is still astronomical winter.
When does autumn start in the UK?
Autumn starts on 1 September under the meteorological calendar. Astronomical autumn starts at the September equinox, usually around 22 or 23 September.
Does the UK have four seasons?
Yes. The familiar four-season calendar is used in the UK, though the weather within each season is changeable and does not follow a fixed pattern everywhere.
Why do some sources give different season start dates?
They may use different systems. Meteorological seasons begin on the first day of a month, while astronomical seasons begin at an equinox or solstice, whose date varies slightly each year.
Related
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- Seasons in Japan: A Complete Guide
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