Following the announcement that Prince William and Kate Middleton will marry on 29th April 2011 at Westminster Abbey we have looked back at the national weather records over the last 21 years to see what the weather may typically be like on the day they have chosen.
When the wedding was announced it was too early to give a forecast for the big day itself, but at this stage looking at the climatology of the day could be a useful guide.
On average, the day-time maximum temperature is 16.6°C ranging from 9.7 °C in 2004 to 23.5 °C in 1994. The average night-time temperature is 7.8 °C, ranging from 4.2 °C in 2009 to 11.5 °C in 1997
The 29th April saw a dry day (9am to 9pm) in 15 of the years of the last 21, with only 6 seeing rain. The wettest was in 1991 when 15.6mm of rain fell at Heathrow.
The sunniest 29th April were in 1990 and 2000 both seeing 13.2 hours, however 2010, 2004, 1995 and 1991 saw virtually no sunshine at all.
Based on Met Office climatological estimates there is roughly a 1 in 3 chance of seeing more than 1mm or rain and a 1 in 30 chance of seeing more than 10mm of rain on this day in April.
- Royal wedding weather forecast (Met Office News Blog)