2015 Weather

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Annual Report for 2015

A mild year, with MeanMax, Mean & MeanMin being +0.8degC above 30 year average, around 7th highest values in 60 years records here.
The HiMax temperature of 34.4C on 1/7/15 ranks 5th highest for any day in 60 years, and 3rd highest HiMax value for any year beaten by 1990 and 2006.
 LoMin temperature –3.7C on 19/1/15 is the 2nd highest for any year, beaten by –3.6C in 2014, .making two consecutive years lacking very low temperatures.

Overall rainfall ranks 25th in 60 years, so is statistically fairly normal. 
However the distribution of rainfall throughout the year was variable, the 22nd wettest Jan, 8th driest Apr, 14th wettest May, 19th wettest Aug, 16th driest Oct, 14th wettest Nov, and 8th wettest Dec, in 60 years of records here. 

Number of raindays was 21st highest, wetdays 23rd highest but very wet days 15th highest, so proportionately more very wet days.
The wettest single day in 2015 was 12/6/15 with 40mm (20th wettest single day in 60 years) , then 27.6mm on 14/8/15, 18.0mm on 30/12/15.

28 air frosts was the 3rd fewest in 60 years, 11 occurring in Jan, 10 in Feb, 4 in Mar, 1 in Apr, 3 in Nov.
 70 days had a ground frost, ranking 12th fewest in 60 years. For comparison, 77 days had minimum temps below 3.0C, and 64 days below 2.5C, so statistically ground frosts have been recorded when air temperatures have fallen below around 2.75C on average.

 Preliminary analysis of temperatures and rainfall from 1956 to 2015 indicates trends over the 60 years of records here:

    an increase in mean temp of 1.92degrees from 8.67C to 10.59C.

    the number of air frosts has tended to drop, especially in the last decade,

    and snow days show a downward trend.

    an increase in annual rainfall of 13% from 726.9mm to 821.5mm.

    greater extremes of rainfall have occurred within the last 5 years. with 2011 being the lowest recorded, while the following two 2012 and 2014 ranked highest, and 2013 was 4th highest.

  

TEMPERATURE
14.7 mean max (C) , +0.8 diff from av (C)
6.6 mean min (C) ,    +0.7 diff from av (C)
10.6 mean (C),          +0.7 diff from av (C)

HiMax  34.4C on 1/7/15
LoMax   2.3C on 2/2/15 and 29/1/15
HiMin   17.3C on 1/7/15 
LoMin   -3.7C on 19/1/15

RAINFALL 
794.1 rain total (mm), 104 % of av 
189    raindays (with 0.2mm or more)
138    wetdays (with 1mm or more)
 
56     verywetdays (with 5mm or more)
40.0 most rainfall in a day (mm) on 12/6/15

 SNOWFALL
8 days with snow falling, 6  of them in Jan, and 2 dustings Feb and Nov.
0 days with 50% snow cover 

 PRESSURE
1015.5 mean pressure (mb) , +1.0 pressure anomaly (mb)
1040.8 max pressure at any time of day, on 8/2/15 
973.3 min pressure at any time of day, on 30/1/15

FROSTS
The last frost was 13/4/15 and the first frost 22/11/15

THUNDER 
6 days with thunder heard

 HUMIDITY
87.9% at 0900

 CLOUD COVER
61.0% at 0900

 

January 2015 February 2015 March 2015

Statistically a fairly normal January, temperatures normal and rainfall slightly higher than normal at 78mm. However while it was milder 4th, 8th-13th, it became much colder 16th-22nd and 29th-31st .  Notably the high maximum temperature 14.2C on the 9th equals the highest recorded here in 2003. 
Snow fell on 6 days, 13th, 18th, 20th and 28th,29th, 30th, although never settled seriously, the greatest depth recorded at obs hour being 1.5cm on 14th.
There were several windy spells, 7th-16th and 28th-31st, very gusty at times.
While many days saw some bright sunshine at some time, it remained very dull all day on 3rd, 7th, 12th and 21st. No fogs were recorded.

7.0 mean max (C) 
1.3 mean min (C) 
4.1 mean (C)  0.0 diff from av (C)
14.2 high max (C) on 9
2.3 low max (C) on 29 
8.8 high min (C) on 10 
-3.7 low min (C) on 19

78.1 rain total (mm)
118 % of av 
21 raindays (days with >=0.2mm)
14 wetdays (days with >=1mm)
7 very wet days (days with >=5mm)
20 days ground frost 
11 days air frost 4-5, 14-15, 17-21, 23-24

52 cloud cover percent
91 mean RH 

A fairly typical February statistically, with a cool drier start, and mild wetter finish. Some good sunny days, although remaining dull 10th until 16th. Only one day, 23rd, saw snow, but only transient flurries and not settling. Only one day, 8th, with fog.

6.6 mean max (C) 
1.0 mean min (C) 
3.8 mean (C)  -0.4 diff from av (C)
11.6 high max (C) on 25
2.3 low max (C) on 2 
5.8 high min (C) on 26 
-3.5 low min (C) on 2

45.3 rain total (mm)
97 % of av 
14 raindays (days with >=0.2mm)
9 wetdays (days with >=1mm)
3 very wet days (days with >=5mm)
20 days ground frost 
9 days air frost 2-8,17, 22

63 cloud cover percent
92 mean RH  

Seasonal Winter (Dec, Jan, Feb)

HiMax 14.2 (12th = highest in 60yrs)
MeanMax 7.1,  (Normal 6.8)
LoMax 2.3
MEAN 4.3,   (Normal 4.0  )  anomaly +0.3
HiMin 10.3,    
MeanMin 1.5    (Normal 1.2  )
LoMin –3.7          

RAINFALL 186.6mm 
(Normal 195.8mm  )   95.3%

Cloud 4.4 /8   (Normal 5.7  )

Normal March mean temperature and rainfall statistically, although milder periods 7, 10-12,17-22,and 28.  

Coolest nights were 9, 17-19, 23-26, and only 4 air frosts recorded on 9,18,24-25 (only a third of years have this few).

Some good sunny days, mostly 2-7, 10-13, 17-24, 27 and 30-31.

Windy at times especially 1-2, 28-31

Small hail accompanied blustery rainfall on 31st.

10.5 mean max (C) 
2.7 mean min (C) 
6.6 mean (C)  +0.1 diff from av (C)
15.7 high max (C) on 7
5.8 low max (C) on 14 
6.8 high min (C) on 29 
-1.2 low min (C) on 25

55.0 rain total (mm)
101 % of av 
13 raindays (days with >=0.2mm)
11 wetdays (days with >=1mm)
5 very wet days (days with >=5mm)
17 days ground frost 
4 days air frost 19,18,24-25

63 cloud cover percent
88 mean RH 

April 2015 May 2015 June 2015

A mild and dry April, mean temps 1.7degC above normal, giving the 5th highest mean temperature and a mean max 3rd highest in 60 years.

Temperatures were mostly above normal 6-10th, 14-16th, 21-25th.   One morning with an air frost on 13th, and 5 with ground frost on 13, 20, 22, 27-28.

Rainfall only 18.7mm. 8th lowest in 60 years, with most falling 2, 3, 11 and 29. Windy at times, especially 1st, 11-12th.

16.2 mean max (C) 
4.6 mean min (C) 
10.4 mean (C)  +1.7 diff from av (C)
22.1 high max (C) on 23
10.2 low max (C) on 1 
9.3 high min (C) on 25 
-0.3 low min (C) on 13

18.7 rain total (mm)
30 % of av 
9 raindays (days with >=0.2mm)
6 wetdays (days with >=1mm)
0 very wet days (days with >=5mm)
5 days ground frost 
1 day air frost

50 cloud cover percent
84 mean RH 

May temperatures were slightly below normal, coolest days 1, 20,  warmest days 11-13, 21-30.  Night temperature never fell below 3.2C, the 3rd highest minimum in 60 years, so no air frosts, nor ground frosts (which have been recorded 85% of years some time during May).  The warmest temp this month was 20.8C, the 8th lowest on record. So temperatures had neither low or high extremes.
Rainfall was 78.2mm, 135% of normal, the 14th highest on record, most falling 2-5, 29, and 14-18.
Windiest periods 5-6, 10-12 and 19.

15.8 mean max (C) 
7.3 mean min (C) 
11.5 mean (C)  -0.4 diff from av (C)
20.8 high max (C) on 22
9.2 low max (C) on 14 
10.8 high min (C) on 11 
3.2 low min (C) on 1

78.2 rain total (mm)
135 % of av 
16 raindays (days with >=0.2mm)
11 wetdays (days with >=1mm)
 5  very wet days (days with >=5mm)
No ground frost 
No air frost

70% cloud cover percent
81% mean RH 

Seasonal Spring (Mar, Apr, May)

TEMPERATURES
HiMax   22.1 (13th lowest in 60 years)
MeanMax   14.1 (11th highest), normal 13.0,  anomaly +1.1
LoMax   5.8 (15th highest), normal –0.6, 
Mean     9.5 (13th highest), normal  8.6,  anomaly +0.9
HiMin     10.8 ,   normal 14.6, 
MeanMin     4.9 (14th highest), normal  4.3,  anomaly +0.6
LoMin   -1.2  (3rd highest), normal –11.1

RAINFALL
 Total   51.9mm,  normal 171.6, anomaly 85%

Raindays    38  normal 43.1, anomaly 88%
Wetdays     28  normal 32.4, anomaly 86%
VeryWetdays  10  normal 11.4, anomaly 88%

Cloud   61% (12th lowest), normal 5.5

The first half of the month was 1.0deg below normal, but ithe warmer second half made it statistically 0.4deg above normal overall. The hottest day was 30th, when a temp of 31.0C was recorded, building upon the 25.4C on 29th the third highest in 60 years records here (beaten only by 1976 and 2005).The mean max temp was 20.8C, the 11th highest on record.The lowest minimum temp was 4.0C on 10th, so no ground or air frosts.

 Rainfall was 72.7mm (119% of normal), with 50.5mm of this falling on 12th –13th. The aggregated rainfall Jan-Jun is 348mm, around normal.

 Lots of bright sunny days, the exceptions being 12-14th and 26th. The windiest days were 1st-2nd, 6th, and 21st-22nd.

20.8 mean max (C) 
  9.6 mean min (C) 
15.2 mean (C)  +0.4 diff from av (C)
31.0 high max (C) on 30
14.2 low max (C) on 1 
14.5 high min (C) on 30 
4.0 low min (C) on 10

72.7 rain total (mm)
120 % of av 
9 raindays (days with >=0.2mm)
5 wetdays (days with >=1mm)
3 very wet days (days with >=5mm)
No ground frost 
No air frost

50% cloud cover percent
76 mean RH 

 

July 2015 August 2015 September 2015

Mean temperature was 0.5 degrees below normal, with temperatures generally falling during the month. The 1st enjoyed the second hottest July day on record here, although  the 31st  had the ninth lowest coolest night . The month remained fog and frost free.
Rainfall was very slightly above normal, and was well spread across the month, with 20 raindays, the fifth greatest.
Thunder occurred late on 3rd, and into the early hours of 4th, and was most intense 0100-0115 with heavy rainfall. Again on 5th from 1630-1700 with 5mm hailstones.
Windy at times, especially 7th and 8th.
Very good growing weather for fruit and vegetables!

21.2 mean max (C) 
11.5 mean min (C) 
16.4 mean (C)  -0.5 diff from av (C)
34.4 high max (C) on 1
13.1 low max (C) on 24 
17.3 high min (C) on 1 
 4.6 low min (C) on 31

64.1rain total (mm)
109 % of av 
20 raindays (days with >=0.2mm)
16 wetdays (days with >=1mm)
 4 very wet days (days with >=5mm)
No ground frost 
No air frost

54% cloud cover percent
82 mean RH

A bright and dry start to the month, broken by torrential rain from midnight to noon on 14th, with 27mm falling.  Changeable, wetter and duller second half to the month, finishing with heavy rainfall overnight on 31st.
Temperatures around normal, cooler nights 16th-18th. Warm 7th –12th, and 22nd.  Dull 13th and 30th-31st.
Windy 2nd-5th, 10th, 21st, 26th.
Thunderstorm 22nd from 1720.

21.3 mean max (C) 
11.8 mean min (C) 
16.6 mean (C)  +0.1 diff from av (C)
30.1 high max (C) on 1
14.0 low max (C) on 24 
16.4 high min (C) on 1 
 5.2 low min (C) on 31

88.5 rain total (mm)
133 % of av 
12 raindays (days with >=0.2mm)
10 wetdays (days with >=1mm)
 4 very wet days (days with >=5mm)
No ground frost 
No air frost

69% cloud cover percent
88 mean RH 

Seasonal Spring (Jun, Jul, Aug))

TEMPERATURES
 
HiMax          34.4        
MeanMax    21.1    (anomaly  +0.6C)
LoMax          13.1                             

HighMin       17.3                             
MeanMin    11.0    (anomaly  +0.2C)

RAINFALL
225.3mm , normal 195.2

Mean temperatures 0.7deg below normal, largely due to the mean min temp ranking 9th lowest in the last 60 years. Rainfall at the start, middle and around 22nd of the month totalled 46mm, just 73% of normal. Heaviest daily rainfall was 11.5mm on 21st, 10.5mm on 1st,  8.9mm on 11th and 6.6mm on 14th. Good dry settled spells though, many sunny days, so a pleasant September overall.

18.0 mean max (C) 
  8.3 mean min (C) 
13.2 mean (C)  -0.7 diff from av (C)
22.1 high max (C) on 10
13.5 low max (C) on 14 
12.6 high min (C) on 12 
  3.8 low min (C) on 26

46.3 rain total (mm)
73 % of av 
11 raindays (days with >=0.2mm)
  7 wetdays (days with >=1mm)
  4 very wet days (days with >=5mm)
No ground frost 
No air frost

55% cloud cover percent
94 mean RH   

 

October 2015 November 2015 December 2015

 

A milder and drier month than usual.

Temperatures fell to 2.6C on 12th and 2.7C on 25th giving ground frosts on 2 days only, 11th fewest in 60 years of records here, although never low enough this month for any air frost.

Rainfall was 45mm, 55% of normal, the 10th lowest on record here. This resulted in just 11 raindays (10th fewest), 5 wetdays (6th fewest) and 4 very wetdays,  All the rain fell around the 6th and between 20th  - 29th, with no rain recorded between 8th -19th.

Cumulative rainfall for 10 months Jan-Oct of 592mm is on the low side, about one third the way up the rank order for the last 60 years.

Plenty of days with some good sunshine, notably 1st-2nd, 4th,  8th-15th, 17th, 20th, 22nd, 25th-26th. Dullest days were 18th-19th, 29th although 3rd, 7th, 10th, 16th,  23rd  were gloomy too. 

Windiest days were 29th-30th, less so 5th-7th and 21st-24th.

14.8 mean max (C) 
  7.1 mean min (C) 
11.0 mean (C)  +0.6 diff from av (C)
19.3 high max (C) on 2
11.6 low max (C) on 23 
13.4 high min (C) on 
  2.6 low min (C) on  12

45.1 rain total (mm)
55 % of av 
11 raindays (days with >=0.2mm)
  6 wetdays (days with >=1mm)
  4 very wet days (days with >=5mm)
2 days with ground frost 
No days with air frost

57% cloud cover percent
94% mean RH     
 

   

A  mild month, mean temperature 2.2deg above normal, with a brief return to normal 20th-24th, making this the 3rd mildest November in 60 years here. HiMax 17.0C on 1st was 2nd highest on record, exceeded only in 2007.
Only 3 air frosts and 5 ground frosts were recorded. Many days had cloud cover, the sunniest days being 1st, 12-13th, 20-21st.

Rainfall was 118% of normal, and was distributed across 27 raindays, 22 wet days, which was a record, so just 3 days seeing no rain at all.  A brief light dusting of snow was seen late on 20th, but soon melted overnight. 

Fog was seen 1st-4th.
Greatest wind run was recorded on 15th, 29th, 18th, 12th, 17th.
Gusts of over 40mph were recorded on several days, with 60mph gusts on 17th  
86.7 rain total (mm)
118 % of av 
27 raindays (days with >=0.2mm)
22 wetdays (days with >=1mm)
  5 very wet days (days with >=5mm)
Ground frost  21st-24th and 28th
Air frost  22nd-24th
 

SEASONAL REPORT FOR AUTUMN 2015

                 this year   normal    anomaly

HiMax           22.1        28.4             MeanMax     14.8       13.8          +1.0  
                             (6th highest in 60 yr)

LoMax             3.6       -2.0                                                 
MEAN              11.1       10.2        +0.9  
                                           
(7th highest )


HighMin          13.4      17.1                            

MeanMin          7.3       6.6         +0.7  

Raindays            49     45.7   (20th highest)

Wet Days            35     33.6  (26th highest)

V Wet Days         13     13.9  (30th highest)

Oktas                  5.1      5.5

A mild autumn, the 7th highest mean temperature in 60 years here.
Mean max was 1.0deg above normal. and mean min 0.7deg above normal.

Rainfall was lower than normal, considerably less than in the three preceeding years, totalling 210mm, 84% of normal for the season.

Rainfall for the 11 months to November is 678mm, so expectation is that the annual total for 2015 will be close to the 60 year median of 763mm.
This follows three years of record-breaking high levels of annual rainfall.
 

Record breaking mild temperatures, the mean temperature here was 9.2C being +4.9deg above the statistical 30 year value of 4.3C . Only on 5 brief occasions during the month was the outside temperature at any time of day lower than that 4.3C value.

The MeanMax, Mean and MeanMin all set a new December record, and are +1.2degC higher than the previous record set in 1974. 

LoMax and LowMin also set a new record, +2.8degC above the previous 2013 record.  So this is the first December in 60 years here with no air frost, the previous fewest was just 1 air frost in 2013.  There was a slight ground frost on just one night, 25th, when the air temperature dropped to 2.8C, the minimum temp for the month. 

Rainfall was 60% above normal for the month, the 8th highest amount for December and not a record total, but it did span a new record 21 wet days and new 2nd highest record 26 raindays.

It was very windy as storm “Frank” passed between Scotland and Iceland between noon on 29th and noon on 30th, when pressure fell from 1016mb to 1002mb here. Winds increased steadily during this pressure fall and gusts climbed to (estimated) 40mph - 50mph during this 24 hour period.

As a narrow rainband crossed this location around 1500 on 31st, pressure dipped sharply, and an estimated gust of 57mph was recorded.

It was a mostly dull month and only a few days saw solar radiation rise above 200W/m2  on 4th, 9th, 23rd, 29th and 31st.


11.7 mean max (C) 
6.7 mean min (C)
9.2 mean (C)  +4.9 diff from av (C)
14.0 high max (C) on 19
8.1 low max (C) on 13 
10.8 high min (C) on 17
2.8 low min (C) on 25

115.4 rain total (mm)
160% of av
26 raindays (>=0.2mm)
21 wetdays (>=1mm)
10 very wet days (>=5mm)

 1 ground frost
 0 air frost
71 cloud cover%
91 mean RH% 

 

 
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