Parts of the United Kingdom are bracing for freezing overnight temperatures and frosty mornings due to the arrival of cold Arctic air. The Met Office forecasts temperatures in northern England and Scotland to drop as low as -3C on Wednesday and Thursday nights, with the possibility of snow on higher ground. The chilly conditions are expected to last for the next few days, with eastern parts of England experiencing particularly cold weather. However, temperatures are expected to rise over the weekend, possibly even exceeding seasonal averages by one or two degrees in places. The Met Office also predicts a risk of heavy rain and possible thunderstorms in southern areas of the UK over the weekend due to an area of low pressure moving across the country.