APRIL COLDER THAN MARCH?

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APRIL COLDER THAN MARCH?

Postby Darren Rogers » 2012 Apr 25, 12:59

My mean temp in March was 7.7c - at present my mean temp' for April is 6.0c - big difference and one I'm sure that is being repeated throughout the country.

obviously march was much warmer than average and april looks like going the other way - this surely can not be unprecedented, but if that 1.7c gap remains surely that must come close to a record?

Does anyone know?
Darren Rogers
Maulds Meaburn
Cumbria (Half way between Shap and Appleby)

http://www.mauldsmeaburnweather.co.uk
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Re: APRIL COLDER THAN MARCH?

Postby Stephen Burt » 2012 Apr 25, 14:50

Based on data for the Reading area, since 1917 April has been colder than March (lower mean temperature, 1/2 max+min) six times in those 95 years, so it's a roughly once in 15 year event - not common, but not unprecedented either. An additional two years in that period saw the two months with identical mean temperatures - most recently in 1991: while both 1990 (0.2 degC below) and 1989 (0.9 degC) saw April slightly cooler than March. April 1998 was only 0.1 degC warmer than March in that year.

Using my own figures for April to date, it's running 1.2 degC below March, although still with six days data to go of course. The difference has been greater only in one year since 1917 - 1938, when April was 1.9 degC cooler than March. April 1938 was also a notably dry month as well of course, unlike this month.

On the longer perspective given by the Central England Temperature series, since 1659 April has been colder than March on 13 occasions in 352 years, an average recurrence of 27 years. Notably, nine of the 13 occurred in the 20th century, most recently in 1998 (-0.2 degC). There were no such occurrences in almost 100 years between 1809 and 1903.

Perhaps more notable here has been the complete absence of any warm weather. Last month saw 21.9 °C on 28th; this month we've yet to exceed 14.5 °C. If this persists to Tuesday morning, 1 May, it will be the lowest April absolute max on the 95 year record: the previous lowest to date has been 15.3 °C in 1989.

(Ah, the joys of having all this at my fingertips in Excel ... :-))

SB
-----
Stratfield Mortimer, Berkshire - central southern England
51.4°N, 1.0°W, 60 m AMSL, station grade A - AAAA47R
Records commenced here 1987 - local records available back to 1862
The Weather Observer's Handbook: www.measuringtheweather.com
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Re: APRIL COLDER THAN MARCH?

Postby Darren Rogers » 2012 Apr 25, 16:02

Stephen - good and interesting facts - like the comment re excel!

I'm only going on a high max' of 12. 5c so far (only been 12c+ x3 so far this month).

So the diff' of 1.7c between March and April is only beaten the once, but the 1 in 15 yrs fact slightly surprised me as possiably expected it to be that bit higher - the 1 in 25 seeming more likely, in my eyes at least.
Darren Rogers
Maulds Meaburn
Cumbria (Half way between Shap and Appleby)

http://www.mauldsmeaburnweather.co.uk
Darren Rogers
 
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Location: Cumbria - half way between Shap and Appleby in the Eden valley

Re: APRIL COLDER THAN MARCH?

Postby brugge » 2012 Apr 29, 11:00

I made this last week using actual obs and forecasts for about one week ahead -
I think it is still quite accurate.

See http://www.met.rdg.ac.uk/~brugge/April_ ... s_2012.jpg

(I hope this works - I tried to attach it but that failed).

Roger
brugge
 
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Re: APRIL COLDER THAN MARCH?

Postby Andrew Norbury » 2012 Apr 29, 11:15

Looking like April is going to be 1.3 deg C colder than March here in this part of Cheshire.
not exceeded 13.6 deg C yet this month but that will probably change tomorrow.
Smallwood Sandbach Cheshire-NW England
51.16N,2.33W 79m AMSL station grade A-AAAA47-
Records commenced 1966, local rainfall back to 1866.
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Re: APRIL COLDER THAN MARCH?

Postby Darren Rogers » 2012 Apr 29, 19:52

Here in my part of Cumbria April will be 1.5 or 1.6c colder than March - big diff'.

So far at OBs the wind has been from WNW - Ne on 17 days and E another two - weatherlink tells me that the wind is predominantly NE - for a whole month that's quite unusual I suspect.

Today the AWS max' is 6.5c (I expect the screen max' to be slightly higher) - but if no higher than the previous max' for the month of 6.8c then will pobably have the situation of the highest and lowest Max' temps falling on successive days, ie: 29th and 30th!

Is there any theme to what the summer may hold on the occassions when April has been colder than March?
Darren Rogers
Maulds Meaburn
Cumbria (Half way between Shap and Appleby)

http://www.mauldsmeaburnweather.co.uk
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Re: APRIL COLDER THAN MARCH?

Postby Bill Wade » 2012 Apr 30, 09:38

Difference at Pateley Bridge is likely to be -2.0 (March 8.4, April 6.4).
The only previous such occurrences in my records (from 1984) were 1990 (difference -0.4) and 1989 (-0.6).
Rainfall total is 179.1mm (up to this morning) - just in excess of the April 2000 figure (178.5) but below April 1986 (185.1).
Bill
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Re: APRIL COLDER THAN MARCH?

Postby Graham Easterling » 2012 Apr 30, 16:05

In Penzance (with a few hours to go) my coldest April on record @ 8.9C, giving an anomaly of -1.0C. Not only does that make it 0.9C colder than March, but January '02, '07 & '08 were all warmer.

As Stephen noted, a lack of warm weather. This is the 1st April I have ever recorded when the temperature has failed to reach 15C (Highest 14.6C on 26th). Though I rather suspect it was much warmer where he was today.
Graham

Penzance Weather Station
Grid Ref:
SW464231 - Post Code: TR18 4TP
19m AMSL - Aspect SSE
In a SE - NW orientated valley

23 Years of Penzance Weather Records : http://penzanceweather.atspace.com/weather.html
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Re: APRIL COLDER THAN MARCH?

Postby Ken Cook » 2012 Apr 30, 16:53

Bill Wade wrote:Difference at Pateley Bridge is likely to be -2.0 (March 8.4, April 6.4).
Rainfall total is 179.1mm (up to this morning) - just in excess of the April 2000 figure (178.5) but below April 1986 (185.1).
Bill


Exactly the same temperature difference here in Copley, March 7.3C April 5.3C
Rainfall 156.8mm wettest April since 2000 (170.6mm)
Ken
Copley, Teesdale
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Re: APRIL COLDER THAN MARCH?

Postby Nick Gardner » 2012 Apr 30, 18:54

Down here in the South West, this April was also rather colder than March:

Mean temperature:
March = 9.3°C
April = 8.1°C
Near Newton Poppleford, Sidmouth - Devon
50:41N 3:17 W; 20 metres AMSL; Station Grade B-BAAA37
http://www.ottervalley.co.uk
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