December 2005 and 2005 Annual Summary at Hazlehead, Aberdeen
- From: "Richard Slessor" <RichardSlessor@xxxxxxx>
- Date: 4 Jan 2006 03:54:24 -0800
December 2005 statistics from Hazlehead in Aberdeen
Readings made using a Davis Vantage Pro 2 Automatic Weather Station.
TEMPERATURE (°C)
Mean Max: 6.5
Mean Min: 2.8 (same as November)
Overall Mean: 4.6
Highest Max: 12.8 (11th)
Lowest Max: 1.0 (28th)
Highest Min: 7.7 (15th)
Lowest Min: -5.2 (29th)
RAINFALL (mm)
Total: 83.6
Highest Day Total: 18.2 (26th)
Days with rain (>=0.2): 21
Days with rain (>=1) : 17
Total Rainfall Duration : 61.4 hrs
Highest Daily Duration: 13.3 hrs (2nd)
Average Rainfall Rate: 1.36mm/hr
Peak Rainfall Rate: 25.6mm/hr (11th)
BAROMETRIC PRESSURE (mb) and HUMIDITY (%)
Mean Pressure (at 9am): 1013.6
Highest: 1042.7 (12th)
Lowest: 979.9 (31st)
Mean Humidity (at 9am): 86.5
Mean Humidity (at 3pm): 84.5
Highest Humidity: 96% (various dates)
Lowest Humidity: 60% (21st)
SNOW and FROST
Days with snow/sleet falling: 5
Days with snow lying (>50% cover) at 9am: 5
Max snow depth: 6cm (17th)
Number of air frosts: 7
Total frost duration: 72.5 hrs
Longest spell of continuous frost : 28.7 hrs (28th/29th)
Overall: A horrendous start with 41.4mm of rain and virtually no
sunshine during the first 5 days. Also very mild, particularly by
night. This raised fears of a possible repeat of December 2002 but
these were fortunately unfounded.
It was generally dry, sunny and mild from the 6th to 24th but there was
a brief cold and snowy period on the 16th and 17th. There were so few
frosts up to Christmas (4 compared to 7 minimums above 5.6) that some
spring phenomena were observed such as a gorse bush being in full
flower on the 23rd.
The weather turned more seasonable during the last week with some
shortlived snow and frost.
This month had the highest and lowest pressure readings since I began
recording in May and also the highest number of rain days and wet days.
More than 6mm was recorded on 6 days.
2005 SUMMARY:
Highest Max: 25.9 (18th June)
Lowest Max: 1.0 (29th Dec)
Highest Min: 16.8 (10th & 11th July)
Lowest Min: -5.2 (29th Dec)
Total Rainfall (30 May - 31 Dec) : 427.0mm on 110 days
Estimated annual total: c. 690mm.
No more than 7 consecutive dry days despite a drier than average year.
This is the shortest "longest dry spell" since at least 1924. Most
years have at least 10 consecutive dry days.
Highest Daily rain total: 52.2mm (11th October)
Days with snow/sleet falling: 41 (Jan 7, Feb 11, Mar 7, Apr 2, May 3,
Nov 6, Dec 5)
Days with >50% snow cover at 9am: 19 (Jan 1, Feb 6, Mar 4, Nov 3, Dec
5)
Max snow depth: 6cm on 17th Dec. (lowest since 1997)
Days with thunder: 1 (distant rumbles on 19th June making this one of
the poorest years for thunder ever recorded in Aberdeen. Dyce had no
days with thunder heard during 1983 and only 1 in 1971, 1974, 1988 and
1989)
Sunshine Total ( at Dyce) : 1431 hours making it less sunny than every
year since 1998, except 2002. 10-year average has fallen to 1452 hours
having been at 1479 hours up to 2003.
Overall: Just about the least interesting year of weather I have ever
experienced or know about. Even 1974 and 1988 were far more interesting
than this pathetically bland year. No extremes of temperature, no
exceptionally dry or wet month, no prolonged dry spell, no thunder, no
heavy snow. The only remotely memorable events were the high 48-hour
rain total in October and one of the coldest ends to July on record
(and I'd prefer to forget that one)
Richard Slessor,
Hazlehead, Aberdeen.
.
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