Culdrose, sunrise to sunset, 1997–2017
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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 21 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 21 years  (1997–2017).
Time slot: sunrise to sunset  (all daylight hours); click below on any-hour, or on the start time for a specific 2-hour slot (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 all daylight hours) 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 0 0 0 0 0 0 0 0  1  0%
≤ 10 mph 2 1 1 1 0 1 1 2 1 2 2 2  15  4%
≤ 15 mph 4 3 4 4 3 4 5 5 5 5 4 4  52  14%
≤ 20 mph 5 5 5 6 5 5 6 6 7 5 5 5  66  18%
≤ 30 mph 6 6 6 8 7 7 7 8 8 7 6 7  85  23%
≤ 40 mph 7 7 7 9 8 8 8 8 8 8 7 8  94  26%
any wind 8 8 8 10 8 8 8 8 8 8 7 9  97  27%
‘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 21 years) in the average number of days in each month for which (in all daylight hours) 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 +0.1   −0.1       −0.1           −0.1
≤ 15 mph +0.1 −0.1 −0.1 +0.1   −0.1 −0.1     +0.1     +0.1
≤ 20 mph +0.1 −0.2 −0.1 +0.1   −0.1       +0.1   −0.1 −0.1
≤ 30 mph   −0.2 −0.1 +0.2 −0.1     +0.1 +0.1 +0.1   −0.1 +0.2
≤ 40 mph +0.1 −0.1 −0.1 +0.3   +0.1 +0.1 +0.1 +0.1 +0.2 +0.1   +0.7
any wind +0.1     +0.3   +0.1 +0.1 +0.1 +0.1 +0.2 +0.1   +1.0
Empty cells indicate negligible change; ‘Total’ shows the sum of the trends over the whole year.

Visibility analysis

This is the number of days in each month, on average, for which (in all daylight hours) the visibility was adequate. That is, for the entire day:
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
Good days 14 13 12 14 11 10 10 11 12 13 14 17  153  42%

Bad weather analysis

This is the number of days in each month, on average, for which (in all daylight hours) no bad weather occurred. That is, for the entire day, 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 10 11 14 14 13 13 12 13 14 12 10 11  149  41%

Wind speed analysis

This is the number of days in each month, on average, for which (in all daylight hours) 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 0 0 0 0 0 0 0 0 0 0 0 0  1  0%
≤ 10 mph 3 3 3 2 2 2 3 4 3 3 4 4  35  10%
≤ 15 mph 9 9 10 10 11 13 15 15 14 12 10 10  139  38%
≤ 20 mph 13 12 14 15 17 19 20 20 18 15 14 13  191  52%
≤ 30 mph 20 19 21 23 25 26 27 27 24 23 21 20  277  76%
≤ 40 mph 26 24 27 28 29 29 30 30 28 28 26 26  333  91%

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

All text Copyright © Mike Cowlishaw 2008, 2018. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2018-02-09.