Culdrose, 16:00 to 18:00, 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, 1.7% 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: 16:00 to 18:00  (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 0 0 0 0 1 0 0  4  1%
≤ 10 mph 0 3 4 5 4 5 5 6 5 3 0 0  41  11%
≤ 15 mph 0 7 10 12 12 14 15 14 13 6 0 0  103  28%
≤ 20 mph 0 9 12 16 15 17 17 17 15 7 0 0  127  35%
≤ 30 mph 0 10 14 19 18 19 19 19 17 9 0 0  145  40%
≤ 40 mph 0 11 16 20 20 20 20 20 18 9 0 0  155  42%
any wind 0 12 17 21 20 20 20 20 19 9 0 0  158  43%
‘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 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         −0.1   −0.1           −0.1
≤ 10 mph     −0.1   −0.1   −0.1 −0.2 −0.1       −0.5
≤ 15 mph     −0.2 +0.1 +0.1 +0.1   −0.1 −0.1        
≤ 20 mph   −0.1 −0.1     +0.1             −0.2
≤ 30 mph   −0.1 −0.1 +0.1 −0.1 +0.1   +0.1 −0.1        
≤ 40 mph     −0.1 +0.2 +0.1 +0.2 +0.1 +0.1   +0.1     +0.7
any wind       +0.3 +0.1 +0.2 +0.1 +0.1 +0.1 +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 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 15 20 23 22 22 22 22 22 11 0 0  178  49%

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 18 22 24 25 23 24 24 22 21 18 19  258  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 1 1 1 1 1 1 1 0 1 2 2  12  3%
≤ 10 mph 7 7 6 6 7 7 8 9 8 8 9 8  90  25%
≤ 15 mph 15 13 16 17 18 20 22 21 19 18 16 15  209  57%
≤ 20 mph 18 18 20 22 23 24 26 26 23 21 20 18  258  71%
≤ 30 mph 24 23 25 27 28 28 29 30 27 27 25 23  313  86%
≤ 40 mph 28 26 29 29 30 30 31 31 29 29 28 28  349  95%

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.