Culdrose, any hour sunrise to sunset, 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, 0.3% of daylight visibility records missing, 1.8% of daylight precipitation records missing, 0.3% of daylight wind records missing.

This is the analysis for the average of 19 years  (1997–2015).
Time slot: sunrise to sunset  (any daylight hour); click below on the start time for a specific 2-hour slot, or on all-day 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 some daylight hour) 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 Hours
≤ 5 mph 5 5 6 6 7 9 10 11 7 6 5 5  83  23%  248  5%
≤ 10 mph 11 12 14 16 17 20 21 21 18 15 13 12  190  52%  1061  22%
≤ 15 mph 18 19 21 24 25 26 27 27 24 21 20 18  268  73%  1971  40%
≤ 20 mph 20 21 23 25 27 27 27 28 26 23 22 21  291  80%  2288  47%
≤ 30 mph 23 23 25 26 28 28 28 28 26 25 24 23  308  84%  2559  52%
≤ 40 mph 25 24 26 27 28 28 28 28 27 26 26 25  317  87%  2713  55%
any wind 26 25 26 27 28 28 28 28 27 26 26 26  321  88%  2763  56%
‘Total’ shows the total flyable days, on average, in a year, and the same as a percentage.
‘Hours’ shows the total flyable hours, on average, in a year, and the same as a percentage of total daylight hours.

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 some daylight hour) 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 +0.1 −0.1 −0.2   +0.1 +0.2 −0.3 −0.2 +0.1         
≤ 10 mph +0.4 +0.1 +0.1 +0.1 +0.1 +0.2 −0.2 −0.3   +0.1   −0.1   
≤ 15 mph +0.1 +0.2 +0.1 +0.1     −0.1 −0.1 −0.1 +0.1 −0.1 −0.2   
≤ 20 mph −0.2       −0.1   −0.1 −0.2 −0.2 −0.1 −0.3 −0.3  −0.1
≤ 30 mph −0.1 −0.1   −0.1 −0.1   −0.1 −0.2 −0.2 −0.1 −0.2 −0.2  −0.1
≤ 40 mph             −0.1 −0.2 −0.1 −0.1 −0.1     
any wind +0.1 +0.1 +0.1       −0.1 −0.2 −0.1 −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 some daylight hour) the visibility was adequate. That is, for the entire hour:
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
Good days 27 26 26 28 29 28 29 28 27 27 27 27  329  90%

Bad weather analysis

This is the number of days in each month, on average, for which (in some daylight hour) no bad weather occurred. That is, for the entire hour, 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 29 27 30 30 31 30 31 31 29 30 29 29  355  97%

Wind speed analysis

This is the number of days in each month, on average, for which (in some daylight hour) 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 5 5 6 6 7 9 10 11 7 6 5 5  83  23%
≤ 10 mph 11 12 14 16 17 20 21 21 18 15 13 12  190  52%
≤ 15 mph 18 19 21 24 25 26 27 27 24 21 20 18  268  73%
≤ 20 mph 20 21 23 25 27 27 27 28 26 23 22 21  291  80%
≤ 30 mph 23 23 25 26 28 28 28 28 26 25 24 23  308  84%
≤ 40 mph 25 24 26 27 28 28 28 28 27 26 26 25  317  87%

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.