April 2013 statistics and summaries

[TonyH]

April 2013, Lampeter, West Wales

 

Cool and quite dry

 

A high incidence of frost for April, with 11 air frost, and some severe frosts during the first week. Lack of really wet weather excepting the 13^th.

 

1^st – 9^th: Dry with frosty nights. Very cold 1^st, max just 4.4c, then cool to average temperatures by day, however some hard frosts, notably -8.5c 6^th. Plenty of sunshine, some days had unbroken sunshine.

 

10^th – 18^th: Unsettled and windy with rain or showers, wet 13^th with 23.5mm. Very windy at times with a gale on the 17^th. Temperatures around average.

 

19^th - 20^th: High pressure, dry and sunny. Large temperature range 20^th from -3.3c to 15.1c.

 

21^st – 28^th: Changeable and often cool with small amounts of rain at times. However the mildest day of the month was 23^rd at 16.4c. Limited sunshine and quite windy at times.

 

29^th – 30^th: Dry and quite sunny but rather cool and breezy still.

 

Total rainfall: 64.7mm

Wettest day: 23.5mm 13th

Rain days >0.2mm: 15
Wet days >1.0mm: 10
Days of heavy rain >10mm: 1

Mean temperature: 6.6c

Mean Max: 11.5c

Mean Min: 1.8c

 

High Max: 16.4c 23^rd
Low Max: 4.4c 1^st
High Min: 10.6c 14^th
Low Min: -8.5c 6^th

Air frost: 11

Ground frost: 16

Mean RH: 75%

High RH: 99%
Low RH: 35%

Predominant wind directions: SSE
Mean wind speed: 2.7mph

Mean pressure: 1014mbar
Max pressure: 1034mbar 20^th
Min pressure: 991mbar 12^th

 

Days with:
 

Hail: 2
Gale: 1
Thunder: 0

Snow or sleet: 1

Snow lying 0900: 0
Fog: 0

Fog at 0900: 0

Edited May 2, 2013 by TonyH

[The PIT]

A cold month with a very cold start before becoming pleasantly warm mid month before becoming cool again. A very dry month and a fairly breezy month for April.

Temp Ave 7.4C -1C below normal

Rainfall 9mm 14.2% of normal and joint 3rd driest recorded.

 

More details here http://www.sheffieldweather.co.uk/Last%20Months%20Report.htm

and here http://www.sheffieldweather.co.uk/Weather%20Data.htm

[johnholmes]

Cantley monthly for April 2013

The cold March spell lasted into the first week of April then it started to warm up with only 1 ground frost after the 8th (the 24 th consecutive one). A very dry month with only 13.0mm in my rain gauge.

Data comparisons are with my 17 year averages for my back garden and temperatures are in C.

Mean T=8.9 (9.8 C)

Avge Max=13.4 (14.3), highest daytime on 14th with 20.2 and lowest daytime on 1 st with 7.2

Avge Min=4.3 (5.2) with coldest night on 3 rd with -1.4C and warmest night on 14 th with 10.9

There were 10 ground frosts (5) and 5 air frosts (1)

Rainfall 13.0mm with 9 days with o.2mm or more and 4 with 1.0 mm or more and the wettest day had 3.2 mm on 12th with rainfall of a trace or more on 13 (16)

Snow fell on 1 day with no hail, thunder or fog (at 0900 clock time)

Edited May 2, 2013 by johnholmes

[Styx]

HOBART ( pop 210,000 ) is Tasmania's capital city, situated at sealevel and backed by a 1270m mountain range.

 

April - Mid autumn

17 consecutive months of above average monthly temperature almost came to end this month and it was only due to rounding that made this the 18th month on the trot that was warmer than the corresponding monthly average of 1981-2010. After a settled first half with high pressure centres just to the west and to the south east, a modest cold change from the south west brought the first mountain snow for the year, settling to 800m. Two or three days followed that were mostly cloudy and rather cold, with onshore SSE winds. After this a big change in the weather pattern unfolded, with high pressure migrating to northern latitudes ( over northern NSW ) as intense low pressure, well to Tasmania's south, trekked a little closer. This left Tasmania in a broad westerly airstream which was very windy at times with occasional gales, with embedded fronts bringing rain to the west and just a shower or two to Hobart and the more shltered eastern side of the island.

 

Average maximum:  17.9 ( +0.1 )

Average minimum:  9.4 ( -- )

Rainfall:  21mm ( average 53mm )

 

Extremes in daily temperature for April ( Records since 1882 ):

 

Highest maximum:  25.0 ( Record 30.6 in 1941 )

Lowest maximum:  12.5 ( Record 7.7 in 1967 )

 

Highest minimum:  14.7 ( Record 18.6 in 1959 )

Lowest minimum:  5.7 ( Record 0.7 in 1888 )

[TonyH]

Wish we had more reports in here, great that people from the other side of the world post though!

[SP1986]

I'll post my stats tomorrow, but I did break my all time minima record.

[SteveB]

Here are my stats for April

 

Highest Temp 16.7c on the 15th

Lowest Temp -2.4c on the 2nd

Mean min+max 8.9c

Mean min 4.5c

Mean Max 13.3c

Air frosts 4

Rain Days 12

Dry Days 18

Wettest Day 13th 4.5mm

Total Rain 21.9mm

Edited May 4, 2013 by SteveB

[SP1986]

April 2013 Summary and Statistics

Another below average month in the series, April was a month of two halves, with the first being extremely cold for April, following on from March, the second half more reminiscent of an average April, but still below average as a whole. Again a significant cold record was broken, with the records for coldest April temperature on my records, and coldest date record on my records, also longest uninterrupted stretch of air frosts. One of the more notable things for April was a lack of 'April showers', with the month coming in with a fairly rare 1.5mm.. this is also a broken record on my records, but not in the general area. The only thing that saved it from being an exceptional month overall was the high incidence of above average maxima in the second half of the month.

Below are the statistics for my weather station during the month of April

Mean Maximum: 12.8C
Mean Minimum: 3.3C
Overall Mean: 8.05C

Monthly Rainfall total: 1.5mm
Rainfall days: 3 days
Max rainfall in one day: 0.7mm (11th April)
Total Snowfall: 0cm
Snowfall Days (snow falling): 0cm
Max snowfall in one day: 0cm


Highest daily maximum temperature: 18.7C (15th April)
Lowest daily maximum temperature: 6.6C (11th April) 
Highest daily minimum temperature: 12.0C (14th April)
Lowest daily minimum temperature: -4.1C (2nd April)* 

Days with Ground Frost: 14 
Days with Air Frost: 7* 
Days of falling snow: 0
Days of lying snow: 0
Thunder days: 1

Temperature frequency breakdown

Maximum temperature:
5.0C to 9.9C: 4 days
10.0C to 14.9C: 19 days
15.0C to 19.9C: 7 days

Minimum temperature:
-5.0C to -0.1C: 7 days
0.0C to 4.9C: 13 days
5.0C to 9.9C: 8 days
10.0C to 14.9C: 2 days

Compared to the Colwyn Bay average (81-10 average = 8.7), my average comes in at 0.65C below the Colwyn Bay average, making it a slightly below average month

Notable Records Broken in April

- Coldest April night minima on record (-4.1C)
- Longest successive days of air frosts in April (7 days from the 1st to 7th April)
- Most air frost recorded in April (7 days)
- 2nd April is the coldest date in April.
- Rainfall totals were the lowest on April records (1.5mm)

[Stargazer]

My statistics for central Reading in April 2013:

Average maximum: 13.3
Average minimum: 4.1
Average for month: 8.7

Highest maximum: 21.7 (April 25)
Lowest maximum: 4.9 (4)
Highest minimum: 11.8 (14)
Lowest minimum: -3.5 (7)

Air frosts: 5

Rainfall (estimate from Reading University data): 45mm, close to the long-term average.
Sunshine (estimate from Reading University data): 185 hours, around 120% of average.

Days with snow falling: 1
Days with snow lying: 0

Very much a month of two halves, with a very cold start (feeling particularly cold in the nagging easterly wind) but temperatures recovering well in the second half of the month, so the month as a whole was only fractionally colder than the long-term mean.  Rainfall was near average, but the month seemed dry because most of it fell overnight during the second week.  After a pleasantly warm and sunny spell in the third week, the month ended on a cooler and more showery theme.

[reef]

Hedon, East Yorkshire.

 

April 2013

 

Warmest Max: 20.2°C (on 14/04/13)
Coldest Max: 5.7°C (on 08/04/13)
Warmest Min: 11.2°C (on 14/04/13)
Coldest Min: -0.3°C (on 07/04/13)

 

Average Max: 12.1°C (+0.2°C Above 1981-2010 Average)**
Average Min: 4.3°C (-0.7°C Below 1981-2010 Average)
Overall Average: 8.2°C (-0.2°C Below 1981-2010 Average)

 

Rain: 10.4mm (21% Of Normal)
Wettest Day: 27th (3.0mm)
Sunshine: 198 hours (128% Of Normal)

 

Air Frosts: 1
Sleet/Snow Falling: 1 day
Snow lying at 0900: 0 days
Dry Days: 18
Wet Days: 12
Days With Rain >1.0mm: 5
Days With Rain >10mm: 0
Thunder Days: 0
Days With Fog: 0

 

Year 2013 So Far (Jan - Apr)

 

Warmest Max: 20.2°C (on 14/04/13)
Coldest Max: -0.1°C (on 16/01/13)
Warmest Min: 11.2°C (on 14/04/13)
Coldest Min: -8.3°C (on 17/01/13)

 

Average Max: 7.4°C (-1.5°C Below Running 1981-2010 Average)
Average Min: 2.2°C (-1.1°C Below Running 1981-2010 Average)
Overall Average: 4.8°C (-1.3°C Below Running 1981-2010 Average)

 

Rain: 141.4mm (71% Of Normal)
Wettest Day: 09/03/13 (13.2mm)
Sunshine: 425 hours (105% Of Normal)

 

Air Frosts: 24
Sleet/Snow Falling: 38 days
Snow lying at 0900: 18 days
Dry Days: 44
Wet Days: 76
Days With Rain >1.0mm: 38
Days With Rain >10mm: 3
Thunder Days: 1
Days With Fog: 9

 

** Lowest since 2005

 

A dry and sunny April with close to average temperatures. The month was the third coolest of the last 20 years, third driest of the last 30 years and the third sunniest of the last decade. The final mean temperature masked an abrupt changearound mid-month.

 

The first 12 days saw a mean of just 4.8°C with frequent easterly winds, compared to a mean of 10.5°C for the remainder of the month. The maximum temperature of 5.7°C on the 8th was the lowest since 1996. The 7th was the first day with a temperature in double-figures since 30th January. Just a week later on the 14th it reached 20.2°C, making it the third earliest date to reach 20°C in 34 years. The 17th and 18th were very windy, with a maximum gust of 42mph on the latter day, before a brief clear and settled spell on the 20th. The final 10 days were then mainly westerly and changable, though rainfall amounts were still very low.

 

Overall an interesting month due to the abrupt changearound mid-month, but disappointing in that it had no snow, fog or thunder.