April 2021 Stats

[matt111]

April 2021 Barton on Sea, Hampshire

Temperature

Max Temp: 17.2°C (1st)

Min Temp:  -1.7°C (7th)

Mean Max: 12.1 

Mean Min: 2.6

Air Frosts: 5

Rainfall

Total: 4.8mm

Wettest Day: 1.6mm (11th)

Max Rain Rate: 3.6mm/hr (11th)

Pressure

Highest: 1033.5 hPa (15th)

Lowest: 1003.2 hPa (28th)

Snow 

Days with snow falling: 2

Days with snow lying: 0

[Styx]

April - Hobart, Tasmania

A very dry month with a mean temperature anomaly of +0.7c above 1991-2020 or +0.6c above 1961-1990. This month included the hottest April day on record ( 3rd ).

Mean maximum:  18.5  ( +0.6 )

Mean minimum:  10.1  ( +0.7 )

Rainfall:  24mm  ( average 50mm )

Rain days ( +1mm ) :  6/from total 11

Hot and sunny ( 1st-3rd ) with a central Australia air mass drawn south from strong high pressure over east Australia. The 2nd was temporarily cooler behind a weak dry front.  Dry weather continued up to the 9th in a mild to warm westerly wind but then progressively colder in the days that followed, with successive fronts and lowering snowfalls. Snow settling 800m on the 11th.  Less cold up to 19th but occasional fronts from the west bringing a shower or two. A dusting of snow to 1100m on the morning of the 16th. The 20th was a very cold day - the coldest April day since 1995 - behind a southerly front with a few showers. Snow settling 800m. A cold and clear night followed with frost away from the coast. The extreme minimum that night was -7.4c in central Tasmania. Only a couple of showers after this, then dry from the 22nd-30th as high pressure dominated across southern Australia.

Extremes in daily temperature for April ( records since 1882 )

High max:   32.3.....3rd   ( previous record 31.0 in 2014 )

Low max:   10.2.....20th   ( record 7.7 in 1967 )

High min:   15.7.....1st   ( record 18.6 in 1959 )

Low min:   2.0.....21st   ( record 0.7 in 1963 )

Record 

 

 

[Morning Rain]

April 2021: Tamworth, Staffordshire

Temperature

Max Temp: 19.5c (23rd)

Min Temp: -1.0c (13th)

Highest Min: 5.9c (27th)

Lowest Max: 6.5c (7th)

Mean Max: 13.2c

Mean Min: 1.8c

Mean: 7.2c

Rainfall

Total: 5.8mm

Wettest Day: 2.0mm (27th)

Rain Days: 6

Other Stats

Frosts: 8

Ice Days: 0

Snow Falling: 2

Snow Lying: 0

Max Snow Depth: N/A

Thunder Days: 0

Wind Gust Max: 36mph (5th)

[Kirkcaldy Weather]

Kirkcaldy Fife April 2021

[The PIT]

Stand outs for this month coldest month on record here for overnight temperatures. 7th coldest on record and coldest since 1989. The warmest night was the 1st with 5.6C. Light snow fell on five days and one day with sleet.

Second driest on record with the wettest day only being 2.4mm.  Full summery below.

[reef]

It was the coldest, sunniest, frostiest and 2nd driest April in records going back to 1980 for us.

High Max: 17.2C (23rd)
Low Max: 6.6C (6th)
High Min: 5.6C (27th) - lowest since 1986
Low Min: -3.5C (12th) - new record

Mean Max: 10.9C (-1.8C)
Mean Min: 0.5C (-4.3C) - previous record 2.7C in 1986!
Mean Temp: 5.7C (-3.0C) - previous coldest was 5.8C in 1986.

Rainfall: 2.4mm (5%)
Sunshine: 248hrs (151%)
Air Frosts: 14 (Average 1.2, previous highest 5 in 1984)
Sleet/Snow Falling: 6 Days (joint highest)
Snow Lying: 0
Thunder Days: 0
Fog Days: 2
Max Gust: 43mph (6th)

A truly astonishing month.

[B87]

At Heathrow it was the 7th coldest, 7th driest and 7th sunniest April on record! The sunshine hours are estimated values rather than the raw figures, based on the station receiving 133% of its average sunshine.

Edited May 2, 2021 by B87

[Daniel*]

16 minutes ago, B87 said:

At Heathrow it was the 7th coldest, 7th driest and 7th sunniest April on record! The sunshine hours are estimated values rather than the raw figures, based on the station receiving 133% of its average sunshine.

Heathrow had 202.6 hrs.

[B87]

13 minutes ago, Daniel* said:

Heathrow had 202.6 hrs.

Yes, using the raw values. To get the true CS value you have to apply a correction to that number, and that is true with all sunshine recordings taken at that station since September 2005. The sunshine values I requested from the Met Office via a FOI request have already been corrected.

I originally asked them for sunshine data from Kew Gardens for the 2006-2020 period, but since Kew no longer records sun they sent me the corrected Heathrow sunshine values instead. I compared them to the values on the historic data page and there seems to be the following correction made to get the actual value per month:

Jan: 1.08

Feb: 1.08

Mar: 1.08

Apr: 1.09

May: 1.12

Jun: 1.14

Jul: 1.13

Aug: 1.12

Sep: 1.10

Oct: 1.09

Nov: 1.08

Dec: 1.07

Where the raw value is multiplied by that number to get the corrected sunshine total.

The month so far - in the British Isles

WWW.MET.READING.AC.UK

 This link shows that Heathrow recorded 133% of it's 81-10 April average (that being 168.7 hours). 133% of 168.7 is 224.4.

Edited May 2, 2021 by B87

[johnholmes]

Data from Cantley near Doncaster for a truly exceptional month

Cantley summary for April 2021

A cold and frosty month, it even snowed on two days, not settling. Very dry with more than half the total falling late in the day of 30 th

The most air and ground frosts in 24 years in April with only 3 winter months in the same period having higher totals. The average minimum temperature is another record for April. Looking at winter values only 7 occasions over the 3 winter months showed lower values in 25 years

Mean=7.4 (9.8)

Avge Max=13.6 (14.5) Highest daytime=20.0 on 20 th with the lowest daytime being 7.1 on the 6 th

Avge Min=1.3 (5.1) The coldest night was -3.3 on 12 th and the warmest night 7.8 on the 21 st

Rainfall=8.8 (32.9) 2 days with 1.0 mm or more and 6 with 0.2 or more. There were 19 days without even a Tr of rain

14 (1) air frosts and 18 (5) ground frosts

Snow fell on 2 days, not settling, no hail or thunder and 1 0900 morning with fog (<1)

 

 

Edited May 3, 2021 by johnholmes
old age, I managed to miss mention of snow!