A ridiculously warm month! Maximum 16.3C. Mean 5.7C above 1981-2010
average. Mean Max 5.5C above average. Mean Minimum 5.8C above average.
Zero air frosts! Lowest minimum 2.6C
24 rain days but a dry month! Only one day managed 5mm. Rainfall 74% of
mean. A dull, cloudy, windy month. I suspect there was less than 40
hours of sunshine.
No pressure below 1000 mb
Unbelievable!


Summary for December 2015

Temperature (°C):

Mean (min+max) 10.8 (+5.7)
Mean Minimum 8.5 (+5.8)
Mean Maximum 13.1 (+5.5)
Minimum 2.6 day 09
Maximum 16.3 day 19
Highest Minimum 13.0 day 26
Lowest Maximum 9.5 day 14
Air frosts 0

Rainfall (mm):
Total for month 39.1 (74%)
Wettest day 5.0 day 20
Rain days 24
Dry days 7

Wind (mph):
Highest Gust 50 day 30

Pressure (mb):
Maximum 1034.9 day 09
Minimum 1000.0 day 06

Days with snow falling 0
Days with snow lying at 0900 0


Dave

On 01/01/2016 09:53, Dave Cornwell wrote:
A ridiculously warm month! Maximum 16.3C. Mean 5.7C above 1981-2010
average. Mean Max 5.5C above average. Mean Minimum 5.8C above average.
Zero air frosts! Lowest minimum 2.6C
24 rain days but a dry month! Only one day managed 5mm. Rainfall 74% of
mean. A dull, cloudy, windy month. I suspect there was less than 40
hours of sunshine.
No pressure below 1000 mb
Unbelievable!


Summary for December 2015

Temperature (°C):

Mean (min+max) 10.8 (+5.7)
Mean Minimum 8.5 (+5.8)
Mean Maximum 13.1 (+5.5)
Minimum 2.6 day 09
Maximum 16.3 day 19
Highest Minimum 13.0 day 26
Lowest Maximum 9.5 day 14
Air frosts 0

Rainfall (mm):
Total for month 39.1 (74%)
Wettest day 5.0 day 20
Rain days 24
Dry days 7

Wind (mph):
Highest Gust 50 day 30

Pressure (mb):
Maximum 1034.9 day 09
Minimum 1000.0 day 06

Days with snow falling 0
Days with snow lying at 0900 0


Dave


Just down the road from you Dave I recorded 50.22hours of sunshine.

--
Keith (Southend)
"Weather Home & Abroad"
http://www.southendweather.net
Twitter:@SS9Weatherman

In message , Dave Cornwell
writes
Summary for December 2015

Temperature (°C):

Mean (min+max) 10.8 (+5.7)

I suspect that that is actually higher than your mean for the calendar
year 2010, which is quite remarkable.
--
John Hall
"Honest criticism is hard to take,
particularly from a relative, a friend,
an acquaintance, or a stranger." Franklin P Jones

On Friday, 1 January 2016 09:53:39 UTC, Dave Cornwell wrote:
A ridiculously warm month! Maximum 16.3C. Mean 5.7C above 1981-2010
average. Mean Max 5.5C above average. Mean Minimum 5.8C above average.
Zero air frosts! Lowest minimum 2.6C
24 rain days but a dry month! Only one day managed 5mm. Rainfall 74% of
mean. A dull, cloudy, windy month. I suspect there was less than 40
hours of sunshine.
No pressure below 1000 mb
Unbelievable!


Summary for December 2015


My daughter was born in April '85. Since then seven Aprils (as measured by the CET) have been cooler than this December-amazing!

Temperature (°C):

Mean (min+max) 10.8 (+5.7)
Mean Minimum 8.5 (+5.8)
Mean Maximum 13.1 (+5.5)
Minimum 2.6 day 09
Maximum 16.3 day 19
Highest Minimum 13.0 day 26
Lowest Maximum 9.5 day 14
Air frosts 0

Rainfall (mm):
Total for month 39.1 (74%)
Wettest day 5.0 day 20
Rain days 24
Dry days 7

Wind (mph):
Highest Gust 50 day 30

Pressure (mb):
Maximum 1034.9 day 09
Minimum 1000.0 day 06

Days with snow falling 0
Days with snow lying at 0900 0


Dave

On 01/01/2016 10:49, Keith (Southend) wrote:
On 01/01/2016 09:53, Dave Cornwell wrote:
A ridiculously warm month! Maximum 16.3C. Mean 5.7C above 1981-2010
average. Mean Max 5.5C above average. Mean Minimum 5.8C above average.
Zero air frosts! Lowest minimum 2.6C
24 rain days but a dry month! Only one day managed 5mm. Rainfall 74% of
mean. A dull, cloudy, windy month. I suspect there was less than 40
hours of sunshine.
No pressure below 1000 mb
Unbelievable!


Summary for December 2015

Temperature (°C):

Mean (min+max) 10.8 (+5.7)
Mean Minimum 8.5 (+5.8)
Mean Maximum 13.1 (+5.5)
Minimum 2.6 day 09
Maximum 16.3 day 19
Highest Minimum 13.0 day 26
Lowest Maximum 9.5 day 14
Air frosts 0

Rainfall (mm):
Total for month 39.1 (74%)
Wettest day 5.0 day 20
Rain days 24
Dry days 7

Wind (mph):
Highest Gust 50 day 30

Pressure (mb):
Maximum 1034.9 day 09
Minimum 1000.0 day 06

Days with snow falling 0
Days with snow lying at 0900 0


Dave


Just down the road from you Dave I recorded 50.22hours of sunshine.

-------------------------------------------------------------
Thanks Keith - I guess that is still quite low and most of that was
probably yesterday!

On Friday, 1 January 2016 09:53:39 UTC, Dave Cornwell wrote:
A ridiculously warm month! Maximum 16.3C. Mean 5.7C above 1981-2010
average. Mean Max 5.5C above average. Mean Minimum 5.8C above average.
Zero air frosts! Lowest minimum 2.6C
24 rain days but a dry month! Only one day managed 5mm. Rainfall 74% of
mean. A dull, cloudy, windy month. I suspect there was less than 40
hours of sunshine.
No pressure below 1000 mb
Unbelievable!


Summary for December 2015

Temperature (°C):

Mean (min+max) 10.8 (+5.7)
Mean Minimum 8.5 (+5.8)
Mean Maximum 13.1 (+5.5)
Minimum 2.6 day 09
Maximum 16.3 day 19
Highest Minimum 13.0 day 26
Lowest Maximum 9.5 day 14
Air frosts 0

Rainfall (mm):
Total for month 39.1 (74%)
Wettest day 5.0 day 20
Rain days 24
Dry days 7

Wind (mph):
Highest Gust 50 day 30

Pressure (mb):
Maximum 1034.9 day 09
Minimum 1000.0 day 06

Days with snow falling 0
Days with snow lying at 0900 0


Dave

Because I'm 09-09 here in Wanstead December was technically not frost free. Temp fell to -0.2C at 0639. Obviously lots of 'what ifs' but I'm just keeping it consistent with the old stats at Greenwich which were 09-09.
The best argument I've seen for 09-09 is that most observers are not around at midnight to read the manual instruments.

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On Friday, 1 January 2016 11:16:18 UTC, John Hall wrote:
In message , Dave Cornwell
writes
Summary for December 2015

Temperature (°C):

Mean (min+max) 10.8 (+5.7)

I suspect that that is actually higher than your mean for the calendar
year 2010, which is quite remarkable.
--
John Hall


I doubt if that's quite true if this place is anything to go by though it's not far off.
December mean here was 10.2°(+5.6) but the annual mean was 10.8° (+0.6). One remarkable statistic is the uniformity of max's during the month. The highest was 14.8°, the lowest 9.1° and the standard deviation of the daily figures, something I evaluate for each month, was only 1.27° or about one-third of its normal value for a winter month.

Tudor Hughes, Warlingham, NE Surrey, 557 ft, 169 m.

In message ,
Tudor Hughes writes
On Friday, 1 January 2016 11:16:18 UTC, John Hall wrote:
In message , Dave Cornwell
writes
Summary for December 2015

Temperature (°C):

Mean (min+max) 10.8 (+5.7)

I suspect that that is actually higher than your mean for the calendar
year 2010, which is quite remarkable.
--
John Hall


I doubt if that's quite true if this place is anything to go by
though it's not far off.
December mean here was 10.2°(+5.6) but the annual mean was 10.8°
(+0.6).

I take it that's your annual mean for 2015, though. That's why I
specified the annual mean for 2010 to be compared with, as being the
coldest year within the last couple of decades or so. Your annual mean
anomaly of +0.6 suggests that your average annual mean is 10.2, which
this December's mean has equalled.

One remarkable statistic is the uniformity of max's during the month.
The highest was 14.8°, the lowest 9.1° and the standard deviation of
the daily figures, something I evaluate for each month, was only 1.27°
or about one-third of its normal value for a winter month.

Yes, that is indeed remarkable.
--
John Hall
"Honest criticism is hard to take,
particularly from a relative, a friend,
an acquaintance, or a stranger." Franklin P Jones

On Fri, 1 Jan 2016 08:17:01 -0800 (PST), Scott W wrote:




Because I'm 09-09 here in Wanstead December was technically not frost free. Temp fell to -0.2C at 0639. Obviously lots of 'what ifs' but I'm just keeping it consistent with the old stats at Greenwich which were 09-09.
The best argument I've seen for 09-09 is that most observers are not around at midnight to read the manual instruments.

Scott, If you are using the standard 09-09 reporting the minimum read at 0900 is
credited to the day on which it is measured. Therefore, the 24-hour minimum
measured at 0900 this morning (1st Jan) is the minimum for 1st Jan. The min of
-0.2 at 0639 this morning therefore 'belongs' to 1st Jan.

In contrast, the 24-hour max temp and the 24-hour rainfall measured at 0900 are
'thrown back' to the previous day. Therefore the 24-hour max temp mearured at
0900 today 'belongs' to 31st Dec, as does the 24-hour rainfall measured at 0900
today.

I'm not saying that this is necessarily the best system but it is the standard
system used at 'official' observing stations and it does enable comparison with
those stations.

On Friday, 1 January 2016 17:30:19 UTC, Norman Lynagh wrote:
On Fri, 1 Jan 2016 08:17:01 -0800 (PST), Scott W wrote:




Because I'm 09-09 here in Wanstead December was technically not frost free. Temp fell to -0.2C at 0639. Obviously lots of 'what ifs' but I'm just keeping it consistent with the old stats at Greenwich which were 09-09.
The best argument I've seen for 09-09 is that most observers are not around at midnight to read the manual instruments.

Scott, If you are using the standard 09-09 reporting the minimum read at 0900 is
credited to the day on which it is measured. Therefore, the 24-hour minimum
measured at 0900 this morning (1st Jan) is the minimum for 1st Jan. The min of
-0.2 at 0639 this morning therefore 'belongs' to 1st Jan.

In contrast, the 24-hour max temp and the 24-hour rainfall measured at 0900 are
'thrown back' to the previous day. Therefore the 24-hour max temp mearured at
0900 today 'belongs' to 31st Dec, as does the 24-hour rainfall measured at 0900
today.

I'm not saying that this is necessarily the best system but it is the standard
system used at 'official' observing stations and it does enable comparison with
those stations.

Thanks, Norman. Am I correct in thinking that the minimum (in this case) must occur before 2359z on 31st? I'd always counted the min (as the max and rainfall) in each 24hr period. I suppose over the course of a month it makes little difference to the overall result whether you use 00-00 or 09-09 - it is merely a technicality?


--

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incoming emails as permitted by law.*