Brize Norton, 10:00 to 12:00, 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: 10:00 to 12:00  (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 3 2 2 2 3 3 3 3 4 2 3 3 ​ 32  9%
≤ 10 mph 9 7 8 10 11 13 14 14 12 9 8 9 ​ 125  34%
≤ 15 mph 14 12 15 18 19 20 22 21 19 17 13 14 ​ 204  56%
≤ 20 mph 15 13 17 20 20 21 23 22 21 18 15 15 ​ 220  60%
≤ 30 mph 16 15 19 21 22 22 23 23 21 20 16 15 ​ 232  63%
≤ 40 mph 16 15 20 21 22 22 23 23 22 20 16 16 ​ 235  64%
any wind 16 15 20 21 22 22 23 23 22 20 16 16 ​ 235  64%
‘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       ​−0.2
≤ 10 mph +0.2 −0.1 −0.1 +0.1 +0.1   +0.1     +0.1 −0.1 +0.1 ​+0.6
≤ 15 mph +0.1 −0.2 −0.2 +0.1 +0.1   +0.1     +0.1 −0.1   ​−0.1
≤ 20 mph   −0.2 −0.2 +0.1 +0.1       −0.1   −0.2   ​−0.5
≤ 30 mph   −0.1 −0.1 +0.1 +0.2 +0.1         −0.1   ​+0.1
≤ 40 mph +0.1 −0.1 −0.1 +0.1 +0.2 +0.1         −0.1 +0.1 ​+0.4
any wind +0.1 −0.1 −0.1 +0.1 +0.2 +0.1         −0.1 +0.1 ​+0.4
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 22 21 23 26 28 27 29 28 26 24 21 21 ​ 294  81%

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 24 23 23 23 24 23 23 23 21 20 ​ 265  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 7 5 3 3 3 3 4 4 5 4 7 8 ​ 55  15%
≤ 10 mph 17 13 13 13 15 17 18 18 17 15 17 18 ​ 191  52%
≤ 15 mph 26 22 23 25 26 27 29 28 27 26 25 27 ​ 311  85%
≤ 20 mph 28 24 27 28 28 28 30 29 28 28 27 28 ​ 334  91%
≤ 30 mph 30 27 29 30 31 30 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.