So I am writing this post on 19th July 2021 which is almost mid of year. Temperature today is nearly 31C. Well they say you can see all four seasons in one day in England and that is true. It can be sunny in morning , rain after some time and cold in night.
December, January are considered extremely cold with snow fall in some areas. You would require warmer layers, heating inside buildings. Days are very short and night is long for example you may have sunset at around 4 pm and sunrise at 8 am. So limited sunshine!
April,May are somehow less chilly and more sunshine. You would need relatively thinner layers like a zipper, light jacket on some times of days/nights. But best to visit tourists points.
June, July August is beach months probably , you might will face heat waves like now and be mindful not every place is air conditioned or fan based. Sunrise will be nearly 4.30-5 am and sunset will be 9-10 pm. But again there maybe some days where T will be like 12 and rainy.
September, October weather will start to come towards chilly sides and days will become shorter.
Remember this ‘IT CAN RAINY ANYTIME AND WEATHER CAN CHANGE , NO BOUNDERIES, ALWAYS BE READY’