Culdrose, 18:00 to 20:00, 1997–2015
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Met Office station 1393: Culdrose, Cornwall  (TR12 7); OS grid reference: SW 672257.
Coordinates:  N50°05'06" W5°15'25"  (50.085 -5.257), elevation 78 m.
Note: gusts not recorded in 6 out of the 19 years, 0.2% of daylight visibility records missing, 1.3% of daylight precipitation records missing, 0.2% of daylight wind records missing.

This is the analysis for the average of 19 years  (1997–2015).
Time slot: 18:00 to 20:00  (two hours); click below for any-hour analysis, or a different start time, or for whole day analysis (all times are GMT):

any-hour  06:00  08:00  10:00  12:00  14:00  16:00  18:00  all-day

‘Flyable days’ analysis

This is the number of days in each month, on average, for which (in this timeslot) the visibility was adequate, and there was no bad weather, and the wind speed was less than or equal to that shown on the left.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
≤ 5 mph 0 0 0 0 1 1 1 1 0 0 0 0  3  1%
≤ 10 mph 0 0 0 1 6 7 8 6 0 0 0 0  28  8%
≤ 15 mph 0 0 0 3 13 14 17 12 0 0 0 0  58  16%
≤ 20 mph 0 0 0 3 15 17 18 13 0 0 0 0  67  18%
≤ 30 mph 0 0 0 4 18 19 20 14 0 0 0 0  74  20%
≤ 40 mph 0 0 0 4 19 19 20 14 0 0 0 0  76  21%
any wind 0 0 0 4 19 19 20 14 0 0 0 0  76  21%
‘Total’ shows the total flyable days, on average, in a year, and the same as a percentage.

Trend analysis

This is the average change (per year, over the 19 years) in the average number of days in each month for which (in this timeslot) the visibility was adequate, and there was no bad weather, and the wind speed was less than or equal to that shown on the left.

For example, if a value of +0.5 is shown for a given month then that implies that since 1997 the number of flyable days in that month has increased by (on average) half a day per year.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
≤ 5 mph                           
≤ 10 mph           +0.2 −0.1 −0.1           
≤ 15 mph       −0.1 +0.1 +0.2   −0.2           
≤ 20 mph       −0.1   +0.1 −0.2 −0.3           
≤ 30 mph       −0.1 −0.1 +0.2 −0.1 −0.1           
≤ 40 mph           +0.3 −0.1 −0.1           
any wind       −0.1 +0.1 +0.3 −0.1 −0.1           
Empty cells indicate negligible change; ‘Total’ shows the average trend over the whole year.

Visibility analysis

This is the number of days in each month, on average, for which (in this timeslot) the visibility was adequate. That is, for the entire timeslot:
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
Good days 0 0 0 5 21 21 22 15 0 0 0 0  84  23%

Bad weather analysis

This is the number of days in each month, on average, for which (in this timeslot) no bad weather occurred. That is, for the entire timeslot, there was no rain, hail, snow, snow on the ground, icing conditions, thunderstorms, etc.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
Good days 19 19 22 23 25 23 24 24 23 21 19 19  261  71%

Wind speed analysis

This is the number of days in each month, on average, for which (in this timeslot) the maximum (gust) wind speed was less than or equal to the value shown on the left.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
≤ 5 mph 2 2 1 2 1 1 1 2 2 2 2 2  20  5%
≤ 10 mph 9 9 9 9 9 10 12 12 12 11 9 8  119  33%
≤ 15 mph 16 17 19 20 20 22 24 24 22 20 17 15  236  65%
≤ 20 mph 19 20 23 24 25 26 27 27 25 22 20 18  275  75%
≤ 30 mph 25 24 27 27 28 28 30 30 28 27 25 24  323  88%
≤ 40 mph 29 27 30 29 30 30 31 31 29 30 28 28  351  96%

Please send any comments, questions, or corrections to me, Mike Cowlishaw, at mfc@speleotrove.com.

All text Copyright © Mike Cowlishaw 2008, 2017. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2017-01-01.