Odiham, 10:00 to 12:00, 1997–2020
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Met Office station 862: Odiham, Hampshire  (RG25 1); OS grid reference: SU 737494.
Coordinates:  N51°14'17" W0°56'38"  (51.238 -0.944), elevation 118 m.
Note: gusts not recorded in 5 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 1 1 1 2 2 2 2 2 2 1 2 2 ​ 21  6%
≤ 10 mph 5 4 5 8 9 9 10 9 8 6 5 6 ​ 83  23%
≤ 15 mph 10 9 13 16 17 18 19 19 17 13 11 11 ​ 173  47%
≤ 20 mph 13 12 16 20 20 21 21 22 20 16 13 14 ​ 209  57%
≤ 30 mph 15 14 17 21 21 22 22 22 21 18 15 15 ​ 224  61%
≤ 40 mph 15 14 18 21 21 22 22 23 22 19 15 16 ​ 227  62%
any wind 15 15 19 21 21 22 22 23 22 19 15 16 ​ 228  63%
‘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          
≤ 10 mph +0.2     +0.2 +0.1     −0.1       +0.1 ​+0.4
≤ 15 mph +0.1   −0.1 +0.2 +0.2 +0.1 +0.1 −0.1       +0.1 ​+0.8
≤ 20 mph +0.1     +0.2 +0.2 +0.1 +0.1 +0.1       +0.1 ​+0.9
≤ 30 mph +0.1     +0.1 +0.3 +0.1 +0.2 +0.1 +0.1 −0.1     ​+0.9
≤ 40 mph +0.1     +0.1 +0.3 +0.1 +0.2 +0.1   −0.1     ​+1.0
any wind +0.1   +0.1 +0.1 +0.3 +0.1 +0.2 +0.1   −0.1 +0.1 +0.1 ​+1.2
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 20 19 22 25 27 26 28 27 25 23 19 20 ​ 281  77%

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 19 19 23 23 22 23 23 23 24 22 19 20 ​ 259  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 3 3 3 3 2 2 2 3 2 2 3 4 ​ 33  9%
≤ 10 mph 10 8 9 10 11 11 12 11 11 10 11 12 ​ 126  34%
≤ 15 mph 20 18 21 22 23 23 24 24 23 22 21 20 ​ 260  71%
≤ 20 mph 25 23 26 27 28 28 29 29 28 27 26 26 ​ 321  88%
≤ 30 mph 29 26 29 30 30 29 31 30 30 30 29 29 ​ 352  96%
≤ 40 mph 30 27 30 30 31 30 31 31 30 31 29 31 ​ 361  99%
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.