Brize Norton, 14:00 to 16:00, 1997–2015
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Met Office station 605: Brize Norton, Oxfordshire  (OX18 3); OS grid reference: SP 292067.
Coordinates:  N51°45'29" W1°34'34"  (51.758 -1.576), elevation 81 m.
Note: gusts not recorded in 4 out of the 19 years.

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 1 2 2 2 2 2 2 2 2 2  23  6%
≤ 10 mph 7 7 8 9 9 11 11 11 12 10 9 9  114  31%
≤ 15 mph 14 13 17 17 18 20 21 20 20 17 15 15  207  57%
≤ 20 mph 16 15 19 19 20 21 22 21 22 18 16 16  225  62%
≤ 30 mph 17 16 20 21 21 22 23 22 23 20 17 17  240  66%
≤ 40 mph 18 16 21 21 22 23 23 22 24 20 17 17  244  67%
any wind 18 16 21 21 22 23 23 22 24 20 17 17  244  67%
‘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   −0.1   
≤ 10 mph +0.1 +0.1   +0.1     −0.1 −0.2 +0.3 +0.1 −0.1     
≤ 15 mph −0.1 −0.2 −0.1 +0.3 +0.1 −0.1   −0.3 +0.1 +0.2 −0.1     
≤ 20 mph −0.2 −0.2 −0.1 +0.3 −0.1   −0.1 −0.3     −0.2 −0.1  −0.1
≤ 30 mph −0.2 −0.2 −0.1 +0.3 +0.1   +0.1 −0.2 +0.1   −0.1     
≤ 40 mph −0.1 −0.1 −0.1 +0.4 +0.1   +0.1 −0.2 +0.2 +0.1 −0.1     
any wind −0.1 −0.1 −0.1 +0.4 +0.1 +0.1 +0.1 −0.2 +0.2 +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 24 23 28 28 29 29 30 29 29 28 24 24  324  89%

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 20 18 22 21 22 23 23 22 24 21 19 20  256  70%

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 4 2 2 2 2 3 2 3 3 3 4 5  35  10%
≤ 10 mph 13 10 11 11 12 14 15 15 15 14 15 15  161  44%
≤ 15 mph 24 21 24 23 25 26 27 28 25 25 25 25  298  81%
≤ 20 mph 27 25 27 26 27 28 28 29 28 28 27 27  327  90%
≤ 30 mph 29 27 29 30 30 29 31 31 29 30 29 30  355  97%
≤ 40 mph 31 28 31 30 31 30 31 31 30 31 30 31  364  100%

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.