Verification is key to continued improvement of our accuracy. It involves comparing our forecasts against relevant observations to determine how accurate they are.
Verification underpins the targets set by government and the Public Weather Service Customer Group (PWSCG). These forecast accuracy targets are part of our ongoing long-term commitment to improving the accuracy of our forecasts to the public.
Forecasts for both maximum and minimum temperature are compared to the actual values observed at an agreed list of 119 sites across the UK. The sites used for verification are those where we have quality-controlled data and where we produce forecasts for.
The early morning forecast on our website is used to produce a percentage number of the times when the forecast is accurate to within +/- 2°C. This is based over a rolling 36-month period to smooth out extremes and give a representative average.
Temperature forecast - performance
This information will be updated every month.
Minimum temperature - first night of forecast
- 86.5% of minimum temperature forecasts are accurate to within +/- 2°C on the first night of the forecast period (36-month average).
Maximum temperature - first day of forecast
- 95% of maximum temperature forecasts are accurate to within +/- 2°C on the current day (36-month average).
Three-hourly temperature forecasts are monitored in the same way as maximum and minimum temperatures, but using our three-hourly forecasts for the current day.
- 95.1% of three hourly temperatures are accurate to within +/- 2°C on the current day (36-month average).