Brize Norton, 12:00 to 14:00, 1997–2020
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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 24 years.

This is the analysis for the average of 24 years  (1997–2020).
Time slot: 12:00 to 14:00  (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 2 1 2 2 2 2 2 2 2 2 3 ​ 25  7%
≤ 10 mph 7 6 8 10 10 13 14 12 12 9 7 8 ​ 115  31%
≤ 15 mph 14 12 16 17 19 21 21 20 20 17 14 14 ​ 203  56%
≤ 20 mph 15 14 18 19 21 22 22 21 21 19 15 15 ​ 221  61%
≤ 30 mph 17 16 20 20 22 23 23 22 22 21 17 16 ​ 238  65%
≤ 40 mph 17 16 20 21 22 23 23 22 23 21 17 17 ​ 242  66%
any wind 17 16 20 21 22 23 23 22 23 21 17 17 ​ 242  66%
‘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 24 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       +0.1 ​−0.1
≤ 10 mph +0.2   −0.1   +0.1 +0.1 +0.1   +0.1 +0.1   +0.2 ​+0.8
≤ 15 mph +0.1 −0.2 −0.2 +0.1 +0.1     −0.2   +0.1 −0.1   ​−0.2
≤ 20 mph   −0.2 −0.1 +0.1 +0.1     −0.2 −0.1   −0.1 −0.1 ​−0.7
≤ 30 mph   −0.1 −0.1 +0.1 +0.1   +0.1 −0.1     −0.1   ​−0.2
≤ 40 mph   −0.1 −0.1 +0.1 +0.2   +0.1 −0.1     −0.1   ​+0.1
any wind   −0.1 −0.1 +0.1 +0.2   +0.1 −0.1     −0.1   ​+0.1
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 23 22 27 27 29 29 29 29 28 26 22 22 ​ 314  86%

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 19 22 21 23 23 23 22 23 22 20 20 ​ 260  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 5 3 2 3 3 2 3 3 3 3 5 6 ​ 40  11%
≤ 10 mph 13 10 12 12 13 16 17 16 15 13 14 16 ​ 165  45%
≤ 15 mph 24 20 22 24 25 26 28 28 25 25 25 25 ​ 297  81%
≤ 20 mph 26 24 26 27 28 28 29 29 27 27 27 27 ​ 325  89%
≤ 30 mph 30 26 29 29 30 29 31 31 29 30 29 30 ​ 354  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, 2021. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2021-05-09.