Brize Norton, any hour sunrise to sunset, 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: sunrise to sunset  (any daylight hour); click below on the start time for a specific 2-hour slot, or on all-day 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 some daylight hour) 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 Hours
≤ 5 mph 11 11 13 17 19 21 23 23 19 15 13 11 ​ 196  54%  772  16%
≤ 10 mph 20 20 23 25 27 28 30 29 27 25 22 20 ​ 295  81%  2027  42%
≤ 15 mph 25 24 28 29 30 29 31 31 29 29 26 25 ​ 335  92%  2893  59%
≤ 20 mph 26 25 29 29 30 30 31 31 29 29 27 25 ​ 340  93%  3033  62%
≤ 30 mph 27 25 29 29 30 30 31 31 30 29 27 26 ​ 343  94%  3145  65%
≤ 40 mph 27 26 29 29 30 30 31 31 30 29 27 26 ​ 343  94%  3171  65%
any wind 27 26 29 29 30 30 31 31 30 29 27 26 ​ 344  94%  3172  65%
‘Total’ shows the total flyable days, on average, in a year, and the same as a percentage.
‘Hours’ shows the total flyable hours, on average, in a year, and the same as a percentage of total daylight hours.

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 some daylight hour) 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 +0.2     +0.1   −0.1   −0.1 +0.1 +0.1 −0.1 +0.1 ​+0.3
≤ 10 mph +0.2 −0.1         +0.1 −0.1 +0.1 +0.1   +0.1 ​+0.4
≤ 15 mph   −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
≤ 40 mph −0.1 −0.1                 −0.1 +0.1 ​−0.1
any wind −0.1 −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 some daylight hour) the visibility was adequate. That is, for the entire hour:
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
Good days 29 27 30 30 31 30 31 31 30 30 28 28 ​ 354  97%

Bad weather analysis

This is the number of days in each month, on average, for which (in some daylight hour) no bad weather occurred. That is, for the entire hour, 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 29 27 30 30 31 30 31 31 30 30 29 29 ​ 355  97%

Wind speed analysis

This is the number of days in each month, on average, for which (in some daylight hour) 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 11 11 13 17 19 21 23 23 19 15 13 11 ​ 196  54%
≤ 10 mph 20 20 23 25 27 28 30 29 27 25 22 20 ​ 295  81%
≤ 15 mph 25 24 28 29 30 29 31 31 29 29 26 25 ​ 335  92%
≤ 20 mph 26 25 29 29 30 30 31 31 29 29 27 25 ​ 340  93%
≤ 30 mph 27 25 29 29 30 30 31 31 30 29 27 26 ​ 343  94%
≤ 40 mph 27 26 29 29 30 30 31 31 30 29 27 26 ​ 343  94%
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.