I referred to the 0900 recording time in a previous thread and really believe it's time to change.

Why? It's quite likely that quite a few sites will record there lowest temperature of December tonight, which in fact will not even happen on the same day, let alone in the same month or even in the same year.

For some, in some ways, it spoils a record breaking month.

I get the arguments for comparison purposes, but does it really make sense?

On Thu, 31 Dec 2015 03:08:20 -0800 (PST), David Mitchell
wrote:

I referred to the 0900 recording time in a previous thread and really believe it's time to change.

Why? It's quite likely that quite a few sites will record there lowest temperature of December tonight, which in fact will not even happen on the same day, let alone in the same month or even in the same year.

For some, in some ways, it spoils a record breaking month.

I get the arguments for comparison purposes, but does it really make sense?

It does make sense if you use manual instrumentation rather than electronic. In
particular, the rain gauges in automatic weather stations, such as the various
Davis instruments, are a bit flaky. I find that mine under-reads by a variable
factor, usually in the range 10-20%, compared to what I measure with a standard
5" manual gauge.

If you use the standard 09z-09z recording period tonight's minimum temperature
will be credited to 1st Jan. As far as the daily minimum temperature is
concerned December ended at 0900z today. For the daily maximum temperature
December ends at 0900z tomorrow.

--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.
http://peakdistrictweather.org

On 31/12/2015 11:34, Norman Lynagh wrote:
It does make sense if you use manual instrumentation rather than electronic. In
particular, the rain gauges in automatic weather stations, such as the various
Davis instruments, are a bit flaky. I find that mine under-reads by a variable
factor, usually in the range 10-20%, compared to what I measure with a standard
5" manual gauge.

If you use the standard 09z-09z recording period tonight's minimum temperature
will be credited to 1st Jan. As far as the daily minimum temperature is
concerned December ended at 0900z today. For the daily maximum temperature
December ends at 0900z tomorrow.

I agree Norman, even though my Davis TBR sits next to my 5" copper gauge
with both rims at 30 cm above the grass, it still under-records by
around 10%.

The difference with my TBR is that the under-recording is quite
consistent and if you times the TBR readings by 1.1 then you get a
result that is almost the same as the manual recordings.

This is even with the TBR being calibrated.

For example, in November my manual gauge gave a total of 68.8 mm whilst
the TBR result (x1.1) gave 66.7 mm. This is pretty typical of most months.

--
Nick Gardner
Otter Valley, Devon
20 m amsl
http://www.ottervalley.co.uk

Tonight's min, read at 0900 tomorrow, will be thrown back to 31 December.

On Thursday, December 31, 2015 at 7:34:46 PM UTC, Desperate Dan wrote:
Tonight's min, read at 0900 tomorrow, will be thrown back to 31 December.

As Norman also pointed out, that's absolutely correct and I have no idea why I said it, as I know it's right.

Now I've retired, can I play the age card?

On Thu, 31 Dec 2015 11:34:45 -0800 (PST), Desperate Dan
wrote:

Tonight's min, read at 0900 tomorrow, will be thrown back to 31 December.

No - The min read at 0900 tomorrow is the min for 1st Jan. It's the max read at
0900 that's thrown back to the previous day. We've already had the min for 31st
Dec i.e. the min read at 0900 today.

--
Norman Lynagh
Tideswell, Derbyshire
303m a.s.l.
http://peakdistrictweather.org

You're correct, apologies!

On Thu, 31 Dec 2015 11:34:38 +0000, Norman Lynagh
wrote:

On Thu, 31 Dec 2015 03:08:20 -0800 (PST), David Mitchell
wrote:

I referred to the 0900 recording time in a previous thread and really believe it's time to change.

Why? It's quite likely that quite a few sites will record there lowest temperature of December tonight, which in fact will not even happen on the same day, let alone in the same month or even in the same year.

For some, in some ways, it spoils a record breaking month.

I get the arguments for comparison purposes, but does it really make sense?

It does make sense if you use manual instrumentation rather than electronic. In
particular, the rain gauges in automatic weather stations, such as the various
Davis instruments, are a bit flaky. I find that mine under-reads by a variable
factor, usually in the range 10-20%, compared to what I measure with a standard
5" manual gauge.

The answer is to read the manual guage at midnight.

Lucky me, I am always up and about then and often not up and about at
9 am! I am therefore unlikely to achieve my lowest minimum for
December tonight, it's currently 7.2 and the number to beat is 3.0 deg
C on Dec. 9th. when I also had my one and only ground frost of the
month at -1.4 deg C.

--
Dave
Fareham (W)

On 31/12/2015 19:47, David Mitchell wrote:
On Thursday, December 31, 2015 at 7:34:46 PM UTC, Desperate Dan wrote:
Tonight's min, read at 0900 tomorrow, will be thrown back to 31 December.

As Norman also pointed out, that's absolutely correct and I have no idea why I said it, as I know it's right.

Now I've retired, can I play the age card?

--------------------------------------------------------------
I hear the Old People's Homes are very good in France ;-)
Dave

Desperate Dan Wrote in message:
Tonight's min, read at 0900 tomorrow, will be thrown back to 31 December.


Should be thrown forward to 1/1/16, surely? Max and rain are
thrown back.
--
Freddie
Pontesbury
Shropshire
102m AMSL
http://www.hosiene.co.uk/weather/
http://twitter.com/PontesburyWx for hourly reports


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