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| July 2000 Monthly Assessment issued
1/8/2000 |
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Monthly summaries available for: England
and Wales | Scotland | Northern
Ireland
Homogenous time series based upon selected station data:
CET | England and Wales
rainfall
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| Mostly cool and often cloudy,
especially in the east. Sunnier and warmer in the west. Thunderstorms
caused local flooding in Surrey and Sussex first week. Sunny
and very warm third week. More unsettled with some thunder
in the last week. |
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Diary of highlights
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1st – 8th A
slack low pressure area persisted for most of the time,
with associated fronts migrating slowly southwards, bringing
showery conditions to many places. Temperatures were near
normal at first but it became cooler later. The 1st to the
5th were particularly wet with widespread outbreaks of rain
and thundery showers. Overnight on the 4th/5th many southern
counties of England were affected by an area of heavy thundery
rain resulting in falls between three and four inches over
parts of Surrey and Sussex. Local flooding was reported
from the Redhill and Reigate area. After the clearance of
a thundery rain belt from the south coast early on the 7th
things became relatively drier and brighter for a time as
a weak ridge of high pressure extended from the Azores high.
9th – 11th The cloudy cool
theme continued as low pressure moved south-east to the
southern North Sea. Winds became northerly with widespread
outbreaks of rain and thundery showers.
12th – 16th With low pressure
centred to the east, NW and N winds brought mainly cloudy
cool weather especially to eastern parts of England. Apart
from some heavy rain early on the 13th around London it
was mostly dry with western areas enjoying some good sunny
periods.
17th – 24th High pressure
was in control much of the time resulting in mostly dry
warm or very warm weather, Wolverhampton reached 2 8°C on
the 21st. There were long sunny periods and light winds
particularly over central and western areas. Mostly clear
nights allowed early morning mist and fog patches to form
in places. East coast counties were cloudier and cooler.
As the high pressure centre moved north a more organised
area of cloud and occasional light rain or drizzle affected
some east coast counties from the 22nd.
25th – 31st More unsettled
conditions returned with fairly widespread thundery showers
on the 27th, 28th and 29th some were accompanied by hail.
There were local patches of early morning mist and fog.
Heavy rain affected north Wales and northern England on
the 31st.
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| Statistical details (using best available
data/estimates): updated 2003 |
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England & Wales Mean Temperature Series ( series
began in 1961 ). The value for the month was 14.9 °C, which
is 0.5 °C below the 1961-1990 average, which is in the close
to average category.
England & Wales Rainfall Series ( series began
in 1961 ). The total for the month was 62.3 mm, which is
100 % of the 1961-1990 average, which is in the close to
average category.
England & Wales Sunshine Series ( series began
in 1961 ). The total for the month was 158.7 hours, which
is 87 % of the 1961-1990 average, which is in the below
average category.
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| Scotland |
| The month was dominated by light winds blowing
mainly from the north or east, and westerly winds blew only
briefly during the second week. There was a marked contrast
in temperature and sunshine from cool and dull in the north-east
to sunny and rather warm in the south-west. At Tiree it was
the driest July since 1955 and the sunniest since records
began in 1927. It was also the sunniest May to July at Tiree. |
| Diary of Highlights |
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1st – 6th Light
north-easterly winds with weak fronts giving bands of cloud.
7th – 10th A major depression
crossed Scotland bringing 31 mm of rain to Glasgow on the
9th.
11th – 14th Unsettled with cool
north-westerly winds and some rain or showers.
15th – 24th A large anticyclone
gave fine weather with 114 hours of sun at Prestwick in
nine days. Temperatures ranged from a minimum of 0 °C
at Aviemore on 17th to 26 °C at Glasgow on 21st.
25th – 29th Slack pressure field
with some heavy showers.
30th – 31st Renewed anticyclonic
conditions.
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Statistical details (using
best available data/estimates): updated 2003
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Scotland Mean Temperature Series (
series began in 1961 ). The value for the month was 12.6
°C, which is exactly the 1961-1990 average, which is in
the close to average category.
Scotland Rainfall Series ( series began in 1961
). The total for the month was 51.4 mm, which is 54 % of
the 1961-1990 average, which is in the well below average
category. Driest since 1989, when 47.6 mm was recorded.
Scotland Sunshine Series ( series began in 1961
). The total for the month was 152.7 hours, which is 108
% of the 1961-1990 average, which is in the close to average
category.
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| Northern
Ireland |
| A dry month. Cool and rather cloudy first
two weeks, then noticeably warmer from the 16th. Very localised
downpours on Friday 28th. |
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Diary of Highlights
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1st – 5th
Dry with temperatures near or slightly above normal. Variable
sunshine.
6th – 15th Cool,
cloudy and with rain or showers - but amounts of rain generally
small. Daytime maximum temperatures only between 14 and
16 °C.
16th – 24th Dry, warm and quite
sunny.
25th – 31st Dry on 25th and 26th, showers
in west on 27th. Widespread showers on 28th. Scattered showers
29th to 31st. Heavy downpours on 28th - particularly in
Central Belfast, with 57.7 mm recorded in 1.5 hour spell,
compared to a daily total of only 0.8 mm recorded at another
site less than 3 miles away.
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Statistical details (using
best available data/estimates): updated 2003
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Northern Ireland Mean Temperature Series ( series
began in 1961 ). The value for the month was 14.4 °C, which
is 0.4°C above the 1961-1990 average, which is in the close
to average category.
Northern Ireland Rainfall Series ( series began
in 1961 ). The total for the month was 40.7 mm, which is
57 % of the 1961-1990 average, which is in the well below
average category. Driest since 1983, when 23.3 mm was
recorded.
Northern Ireland Sunshine Series ( series began
in 1961 ). The total for the month was 140.0 hours, which
is 100 % of the 1961-1990 average, which is in the close
to average category.
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Homogeneous series based upon selected station data: updated
2003 |
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Central England Temperature (series begins in 1659).
The mean value for the month was 15.5 °C which is 0.6 °C
below the 1961-90 normal of 16.1 °C and is in the below
average category. Others: 1999/17.7, 1998/15.5, 1993/15.2
°C.
England and Wales Rainfall (series begins in 1766).
The total for the month was 63.8 mm, which is 103 % of the
1961-90 average and is in the close to average category.
Others: 1999/26.3, 1998/54.4, 1997/53.5, 1996/43.6, 1995/37.6,
1993/88.7 mm.
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| Note: Diary values are provisional based
on data available at the time. |
