On 4 Mar, 14:28, "Richard Griffith" wrote:
I have a datalogger which records the amount of time the sensor is below
freezing, this is quoted in either hours / minutes or Days / Hours /
Minutes. I would be interested to know how other people calculate this data.
The figures I have for February for my station are

Hours * Minutes
08 * * * *18 * * * * * *01-03 Feb
35 * * * *43 * * * * * *03-10th
63 * * * *06 * * * * * *10-17th
37 * * * *12 * * * * * *17-24th
11 * * * *08 * * * * * *24-29th

Which gives me a total of 155hrs 27min.

Regards

Richard
West Sussex.

I take it from my 5 min CR10X data spreadsheet: if 5 min mean temp =
0.0°C then no frost, if = -0.1 then count 5 min frost, sum for the
day then convert to hours and tenths for the daily and monthly
totals.

My Feb 08 total 127.5 h: annual average 1995-2007 404 h here. In Feb
1986 alone my total was 441 h, in those days painstakingly taken from
thermograph chart.

--
Stephen Burt
Stratfield Mortimer, Berkshire