Pembrey Sands, 14:00 to 16:00, 1997–2015
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Met Office station 1226: Pembrey Sands, Dyfed  (SA17 4); OS grid reference: SN 365043.
Coordinates:  N51°42'47" W4°22'05"  (51.713 -4.368), elevation 3 m.
Note: gusts not recorded in 6 out of the 19 years, 2.3% of daylight visibility records missing, 3.1% of daylight precipitation records missing, 2.2% of daylight wind records missing.

This is the analysis for the average of 19 years  (1997–2015).
Time slot: 14:00 to 16:00  (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 2 1 0 0 0 0 0 0 0 1 2 2  10  3%
≤ 10 mph 6 4 4 3 4 4 4 4 5 6 5 6  55  15%
≤ 15 mph 11 10 12 11 12 13 12 12 14 12 11 12  142  39%
≤ 20 mph 15 14 17 17 17 18 19 18 19 16 14 14  199  54%
≤ 30 mph 19 18 21 22 23 24 25 24 23 22 18 19  258  71%
≤ 40 mph 20 19 22 23 24 24 25 25 24 23 20 21  271  74%
any wind 21 20 22 23 25 24 25 25 25 23 21 22  276  76%
‘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     −0.1   −0.1         −0.1 −0.1     
≤ 10 mph −0.2   −0.2   −0.1     −0.3   −0.1   −0.1  −0.1
≤ 15 mph −0.2 +0.2 +0.1 +0.3 −0.1 +0.1 −0.1 −0.3   −0.1 +0.2 −0.3   
≤ 20 mph −0.2 +0.3 +0.1 +0.3 +0.1 +0.1 −0.1   +0.2 +0.2 +0.1 −0.2  +0.1
≤ 30 mph −0.1 +0.3 +0.1 +0.3 +0.2 +0.2   +0.2 +0.3 +0.3   −0.1  +0.1
≤ 40 mph −0.1 +0.2 +0.1 +0.4 +0.2 +0.3 +0.1 +0.2 +0.3 +0.3 +0.1    +0.2
any wind   +0.3 +0.1 +0.4 +0.3 +0.3 +0.1 +0.2 +0.4 +0.4 +0.2 +0.1  +0.2
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 24 22 25 26 27 26 27 27 26 27 25 25  306  84%

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 24 23 26 26 27 27 27 26 26 25 23 25  306  84%

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 3 2 1 1 1 1 1 1 1 2 2 4  18  5%
≤ 10 mph 8 5 6 5 5 5 5 5 6 7 7 8  72  20%
≤ 15 mph 15 13 16 15 15 15 15 15 16 14 14 15  177  49%
≤ 20 mph 20 19 22 22 21 22 21 22 21 19 18 19  246  67%
≤ 30 mph 26 25 28 29 29 29 30 30 28 27 25 26  330  90%
≤ 40 mph 29 27 30 30 31 30 31 31 30 30 28 30  356  97%

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.