England has been stereotyped as being cold, grey and rainy since the ancient Romans wrote home, but this is not an entirely accurate picture. Temperatures rarely get very cold or very hot, and while the country certainly gets rain, it's really not as wet as rumour has it. London alone has lower annual rainfall than Paris and New York, and it's not uncommon for parts of the country to go without rain for weeks. Parts of southern England often have summer water restrictions due to a lack of adequate rainfall during the previous winter. There is plenty of scope for leaving your raincoat at home, but make sure you've got one.
Northern and western parts are usually wetter than the rest of England due to the prevailing wind from the north west bringing down cold moist air from the North Atlantic, and the sunniest and warmest areas are in the far south and south east.
Winter and autumn are usually the wettest seasons where the weather is often very changeable and at times quite windy, especially in the north and west, where cold Arctic winds arrive. Spring conditions are very changeable: a day of hot sunshine is likely as not to be followed by a week of cold wind and rain; and vice-versa. Occasional snow even as late as May is not unheard of in northern England, but it will melt quickly. Snow is particularly rare in the south east. Summer is generally warm in the south with average highs usually ranging from 18-23°C, but be prepared for unsettled weather at any time of the year and make sure to check a weather forecast if you plan to be outdoors.
Hot spells of weather can occur from May to September where temperatures may reach 30°C in the warmest areas of England, typically London and parts of the South East. Central Europe has very hot summers and very cold winters, but England is both less extreme (surrounded by water) and milder in the winter (influenced by the warmth of the North Atlantic Drift). If it were not for the North Atlantic Drift, England would be much much colder.
Heavy, prolonged, snow is rare and temperatures are rarely below freezing for more than a few days. Some years there will be a few days of road and rail disruption from snow - even the slightest amount of snow often causes delays on public transport, especially rail. Very severe weather conditions are rare and remedial action is usually taken promptly. Flooding and droughts are unlikely to affect the traveller. High winds occasionally disrupt travel, most often outside summer.