Brize Norton, 16:00 to 18:00, 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: 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 1 2 3 2 3 2 2 2 1 0 0 ​ 17  5%
≤ 10 mph 0 3 10 10 10 11 12 12 13 4 0 0 ​ 84  23%
≤ 15 mph 0 5 17 17 18 20 22 21 21 5 0 0 ​ 147  40%
≤ 20 mph 0 5 19 19 21 21 23 22 22 6 0 0 ​ 157  43%
≤ 30 mph 0 6 21 21 22 22 24 23 23 6 0 0 ​ 168  46%
≤ 40 mph 0 6 21 22 22 23 24 23 24 6 0 0 ​ 170  46%
any wind 0 6 21 22 22 23 24 23 24 6 0 0 ​ 170  46%
‘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
≤ 10 mph   +0.1 −0.1 +0.2 +0.2 −0.1   +0.1   +0.1     ​+0.5
≤ 15 mph     −0.1 +0.2 +0.1 −0.2   −0.1         ​+0.1
≤ 20 mph       +0.2 +0.1 −0.2   −0.1          
≤ 30 mph     +0.1 +0.2 +0.1 −0.1     +0.1       ​+0.4
≤ 40 mph     +0.1 +0.2 +0.1 −0.1     +0.1       ​+0.6
any wind     +0.1 +0.2 +0.1 −0.1     +0.1       ​+0.6
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 9 28 28 29 29 30 29 28 7 0 0 ​ 217  59%

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 21 19 22 22 22 23 24 23 24 22 20 20 ​ 261  72%

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 6 3 2 3 3 3 2 3 3 5 7 8 ​ 50  14%
≤ 10 mph 17 13 12 13 14 15 16 17 16 17 20 19 ​ 190  52%
≤ 15 mph 26 23 24 24 26 26 28 28 26 27 27 27 ​ 311  85%
≤ 20 mph 27 25 27 27 28 28 29 29 28 29 28 28 ​ 332  91%
≤ 30 mph 30 27 30 30 30 29 31 31 30 30 29 30 ​ 357  98%
≤ 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.