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July 1999

Monthly assessment

July 1999 Monthly Assessment for England and Wales issued 2/8/1999

England and Wales
Mostly very warm, and sunny especially in the south, but cooler in the north and north-west. It was notably dry over some parts of England.
Diary of highlights

After a changeable start it became warm. Thunderstorms developed over Wales and southern England on the evening of the 2nd and rain affected many parts for a time on the 3rd. Cromer (Norfolk) had 45 mm of rain overnight 2nd/3rd. Fairly widespread thunderstorms broke out on the 5th and 6th with 83 mm being recorded at Charing (Kent) late on the 5th. There were numerous reports of funnel clouds and tornadoes particularly in the Midlands, where local structural damage occurred in places. Flash floods were reported from Cannock (Staffordshire).

The weather then became dry, mostly sunny and generally very warm during the 7th to 13th as high pressure settled close by. At Lee-on-Solent 29.6 °C was reached on the 11th.

A westerly breeze brought cooler fresher air on the 14th and 15th. From the 17th to 19th, the extreme south and south-east became sunny, very warm or hot while further north, cloud and a breeze kept temperatures lower. Gravesend (Kent) had a maximum of 30.0 °C on the 18th. By the 21st/22nd low pressure to the north introduced much cooler fresher air to the region, and in eastern and south-eastern areas temperatures barely reached 15 °C.

High pressure dominated the closing week and many places became very warm or hot. At Herne Bay (Kent) 30.0 °C was recorded on 24th. Eastern coasts had a wind off the sea and were affected by low cloud. The month ended with another hot day, Barbourne (Worcester) reached 31.6 °C, but thunderstorms broke out over southern and south-east England during the afternoon.

Many places had a dry month with Manchester recording their driest July since records began in 1942.

Statistical details (using best available data/estimates): updated 2003

Central England Temperature (the CET series begins in 1659) The mean value for the month was 17.7 °C which is 1.6 °C above the 1961-90 normal of 16.1 °C, which is in the well above average category. Others: 1991/17.3, 1989/18.2, 1983/19.5 °C.

England and Wales Rainfall (series begins in 1766) The total for the month was 26.3 mm, which is 42 % of the 1961-90 average, which is in the well below average category. Others: 1984/28.6, 1977/23.7, 1911/15.8, 1825/8.2 mm.

England and Wales Sunshine (series begins in 1961) The total for the month was 234.3 hours, which is 128 % of the 1961-90 average, which is in the well above average category. Others: 1990/263.3, 1989/261.0 hours.

Note: Diary values are provisional based on data available at the time.