Odiham, 08:00 to 10:00, 1997–2017
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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 6 out of the 21 years.

This is the analysis for the average of 21 years  (1997–2017).
Time slot: 08:00 to 10:00  (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 2 3 2 3 3 3 3 2 2 1  26  7%
≤ 10 mph 5 5 7 8 8 10 10 10 8 7 7 6  91  25%
≤ 15 mph 10 10 12 16 17 18 19 18 15 13 12 11  170  46%
≤ 20 mph 12 11 14 18 19 20 21 20 17 15 13 13  193  53%
≤ 30 mph 13 12 14 19 20 21 21 20 17 15 14 14  201  55%
≤ 40 mph 13 12 15 19 20 21 21 20 17 16 14 15  203  56%
any wind 13 12 15 19 20 21 21 20 17 16 14 15  203  56%
‘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 21 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     −0.3
≤ 10 mph   −0.1 +0.1 +0.2   +0.1 −0.1 −0.1 +0.1 −0.1 +0.1   +0.3
≤ 15 mph   −0.1 +0.1 +0.4 +0.2   −0.1   +0.1     +0.1 +0.7
≤ 20 mph −0.1 −0.2 +0.1 +0.4 +0.1 +0.1   +0.1 +0.1 −0.1 +0.1 +0.1 +0.8
≤ 30 mph −0.1 −0.2 +0.1 +0.4 +0.1 +0.1   +0.1 +0.1 −0.1 +0.1   +0.7
≤ 40 mph −0.1 −0.2 +0.2 +0.4 +0.1 +0.1   +0.1 +0.1 −0.1 +0.1 +0.1 +0.8
any wind −0.1 −0.2 +0.2 +0.4 +0.1 +0.1   +0.1 +0.1 −0.1 +0.1 +0.1 +0.9
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 18 16 18 22 24 23 25 23 20 19 18 19  245  67%

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 18 17 22 23 23 23 24 24 23 22 19 19  257  70%

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 4 4 4 4 3 4 4 4 5 4 4 4  48  13%
≤ 10 mph 12 12 14 13 12 14 13 15 15 14 14 13  160  44%
≤ 15 mph 22 20 24 24 24 25 26 27 26 25 24 21  289  79%
≤ 20 mph 26 24 28 28 29 29 30 30 29 28 27 27  335  92%
≤ 30 mph 29 27 30 30 30 30 31 31 30 30 29 30  357  98%
≤ 40 mph 30 28 31 30 31 30 31 31 30 31 30 30  363  99%

Please send any comments, questions, or corrections to me, Mike Cowlishaw, at mfc@speleotrove.com.

All text Copyright © Mike Cowlishaw 2008, 2018. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2018-02-09.