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This
page contains the May 2005 monthly stats and daily summaries for my own
site readings.
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MAY 2005 |
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A warm and sunny start to May proved
not to be a reliable indicator of things to come. The pattern soon settled
into three weeks of domination by mainly northerly winds which brought
cool conditions with little rain. Although there was a normal amount of
sunshine, it didn't counteract the cooling effect of the wind and temperatures
remained generally 2 - 4C below the average for the time of year. There
was a sharp change on the 25th with warm southerly air pushing in from
the Iberian peninsula, and a new site high temperature record for May
(the hottest May day for 52 years in the UK), but the heat was short lived.
A thunderstorm was largely responsible for the rainfall total on the 30th,
giving nearly 14mm in little over half an hour, but water use restrictions
remain a real possibility with a hosepipe ban already in effect in neighbouring
North Sussex.
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| MAY 2005 - MONTHLY SUMMARY | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| *
= deviation from 20 year average. The monthly mean is calculated from all
logged temperatures and is not the simple mean of the daily minimum and
maximum. THW = Shaded Heat Index calculated with cooling/warming effect of wind and humidity to give an apparent temperature. THSW = Unshaded Heat Index calculated with cooling/warming effect of wind, humidity and full direct sunshine to give an apparent temperature. EVAPO-TRANSPIRATION is drying effect due to sun and wind, and is equivalent to "negative rainfall" |
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MAY
2005
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TEMPERATURE ºc
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HUMIDITY
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SOLAR RAD
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PRESSURE
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RAINFALL
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WIND SPEED
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DIRECTION
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DATE
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Minimum
(< 09h) |
Maximum
(< 21h) |
RH %
at 14.00 |
Dewpoint ºc
at 14.00 |
% of max
(Noon GMT) |
hPa †
at 14.00 |
Day Total
(mm) |
Average
(mph) |
High Gust
(mph) |
Dominant
(Compass) |
 |
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1st
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13.3 | 24.0 | 43 | 9.6 | 52 | 1007.0 s | 0.0 | 1.1 | 12 | SSW |
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2nd
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12.6 | 20.7 | 61 | 12.1 | 33 | 1011.6 rs | 2.0 | 1.6 | 16 | SSW |
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3rd
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10.9 | 16.2 | 76 | 10.1 | 27 | 1010.5 fs | 0.5 | 2.8 | 19 | SSW |
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4th
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10.9 | 13.0 | 80 | 7.6 | 6 | 1018.9 r | 0.0 | 2.7 | 20 | N |
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5th
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3.3 | 17.4 | 64 | 7.0 | 24 | 1021.2 f | 0.0 | 1.4 | 13 | N |
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6th
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9.3 | 16.4 | 39 | 1.4 | 54 | 1017.6 s | 0.0 | 2.3 | 17 | N |
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7th
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9.6 | 14.5 | 46 | 2.3 | 86 | 1011.4 s | 0.3 | 3.9 | 21 | N |
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8th
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5.4 | 14.3 | 36 | -1.3 | 18 | 1012.1 f | 1.5 | 1.8 | 18 | SSW |
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9th
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3.4 | 13.6 | 45 | 1.6 | 27 | 1016.0 s | 0.0 | 1.2 | 14 | N |
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10th
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2.4 | 12.3 | 71 | 4.2 | 32 | 1022.2 rs | 0.0 | 1.1 | 18 | N |
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11th
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1.8 | 15.2 | 43 | 1.4 | 96 | 1025.5 s | 0.0 | 0.8 | 12 | N |
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12th
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2.9 | 14.8 | 48 | 3.6 | 80 | 1020.7 fs | 0.0 | 1.9 | 17 | WSW |
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13th
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8.3 | 15.7 | 67 | 5.6 | 45 | 1018.4 s | 0.0 | 2.6 | 17 | WSW |
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14th
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7.2 | 14.3 | 53 | 4.0 | 33 | 1016.9 rs | 0.0 | 1.6 | 14 | N |
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15th
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2.4 | 18.9 | 39 | 2.9 | 79 | 1017.6 fs | 0.0 | 0.6 | 10 | SE |
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16th
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5.3 | 16.8 | 59 | 6.7 | 47 | 1014.9 s | 3.8 | 1.5 | 14 | N |
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17th
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4.1 | 12.7 | 50 | -0.3 | 42 | 1020.3 s | 0.0 | 1.4 | 13 | N |
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18th
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3.3 | 15.3 | 41 | 1.0 | 37 | 1021.8 s | 0.0 | 1.7 | 16 | SSW |
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19th
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9.7 | 13.1 | 89 | 11.1 | 10 | 1015.5 fs | 4.3 | 3.3 | 17 | SSW |
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20th
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11.7 | 16.8 | 71 | 11.0 | 37 | 1010.3 s | 2.0 | 4.4 | 25 | SSW |
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21st
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9.8 | 16.2 | 62 | 8.2 | 27 | 1007.5 f | 3.3 | 3.5 | 24 | SSW |
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22nd
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8.8 | 16.3 | 57 | 7.1 | 85 | 1007.1 s | 0.0 | 4.8 | 20 | SSW |
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23rd
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8.3 | 15.7 | 50 | 4.9 | 51 | 1015.9 rs | 0.8 | 5.0 | 20 | SSW |
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24th
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9.2 | 13.3 | 88 | 10.2 | 11 | 1016.8 s | 1.0 | 5.0 | 22 | SSW |
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25th
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10.3 | 22.3 | 62 | 12.2 | 45 | 1021.8 fs | 0.0 | 2.5 | 14 | SSW |
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26th
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11.4 | 23.6 | 55 | 13.1 | 50 | 1015.8 s | 0.0 | 1.9 | 16 | SSW |
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27th
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11.8 | 30.9 | 41 | 14.4 | 80 | 1009.8 fs | 0.0 | 1.6 | 16 | SE |
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28th
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13.7 | 17.9 | 56 | 8.5 | 26 | 1015.8 rs | 0.0 | 4.9 | 26 | SSW |
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29th
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8.0 | 16.2 | 49 | 5.3 | 32 | 1020.0 s | 0.0 | 0.4 | 6 | SSW |
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30th
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10.4 | 16.3 | 82 | 8.5 | 64 | 1022.9 r | 17.0 | 0.5 | 14 | SSW |
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31st
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5.8 | 19.9 | 45 | 5.5 | 29 | 1024.8 s | 0.0 | 1.3 | 12 | SSW |
| Solar Rad(iation) reading indicates
the state of the sky (approximately) at just after 12h00 GMT as below: 1 - 10 = Dull overcast; 11 - 20 = overcast; 21 - 49 = cloudy; 50 - 74 = hazy or interrupted sunshine; 75 - 100 = bright uninterrupted sunshine |
| † Barometer trend: f = falling, s = steady, r = rising; r = rapidly, s = slowly |
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'WIND ROSE' PLOT FOR THE MONTH
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The 'petals' represent wind direction and the length
represents frequency, i.e. in this case winds from the SSW were the most
common, followed by the N. The colours represent the strength of the wind, with black being weakest through blue then lighter colours (cyan, light green, yellow, magenta, red) being stronger. This data excludes 'calm' readings. |