Royston (Iceni) Weather Station

2009 Annual Summary 

Part 1 Temperature, Rainfall & Sunshine

 

 

 

 

 

        T e m p e r a t u r e (C)

 

 

 

 

 

 

 

 

     Rainfall (mm)

 

    Sunshine (Hours)

 

Month

Mean Maximum

Highest Maximum

Date(s)

Lowest Maximum

Date(s)

Mean Minimum

Highest Minimum

Date(s)

Lowest Minimum

Date(s)

Mean Grass Minimum

Lowest Grass Minimum

Date(s)

Mean Dry Bulb (5 min. obs.)

Mean Earth 30cms 0900 GMT

Mean Earth 30cms 2100 GMT

No. of Air Frosts

No. of Ground Frosts

Air Frost Duration (Hours)

Total

No. of Days with 0.2mm or more

Most in a Day

Date(s)

Rainfall Duration (Hours)

Total

Highest

Date(s)

No. of Days no sun

Month

JAN

5.4

9.6

12

-1.3

9

0.9

7.0

17

-7.0

6

-1.1

-14.0

6

2.6

3.7

3.8

11

18

164.0

49.3

14

6.1

24

46.5

85.7

7.1

31

6

JAN

FEB

6.9

14.4

27

0.6

6

1.8

7.5

25

-4.5

3

-0.5

-9.0

3

3.7

3.9

4.1

10

14

122.2

64.9

15

19.6

9

50.5

65.6

9.7

21

7

FEB

MAR

12.1

16.6

16

7.5

4

3.6

8.7

12

-1.7

5

0.9

-5.5

5

7.1

7.1

7.4

3

13

12.3

31.6

12

9.9

3

26.1

162.4

11.4

18

0

MAR

APR

16.1

21.0

15

10.5

11

6.0

9.9

16

1.7

21

3.6

-1.6

5

10.5

10.9

11.4

0

7

0.0

19.4

9

8.1

16

15.3

196.2

13.3

22

3

APR

MAY

18.7

25.5

31

13.6

4

8.5

12.8

28

3.4

11

6.4

0.5

11

13.1

14.2

14.8

0

0

0.0

34.9

11

19.5

25

16.5

239.3

16.0

30

2

MAY

JUN

21.4

29.0

30

13.5

5

10.6

15.3

 27 29

4.7

4

8.7

1.5

4

15.5

17.4

18.0

0

0

0.0

57.1

11

17.3

26

21.3

210.6

15.5

30

0

JUN

JUL

22.2

29.1

1

18.7

17

12.8

16.5

3

9.1

10

11.4

7.4

10

16.9

18.8

19.4

0

0

0.0

68.9

19

11.5

16

51.2

210.2

14.7

2

0

JUL

AUG

23.0

28.5

19

19.3

21

13.8

17.8

6

10.0

29

12.0

7.5

29

17.8

18.5

19.1

0

0

0.0

77.1

10

52.4

6

17.7

206.6

12.9

23

0

AUG

SEP

20.1

27.1

8

16.2

13

11.1

17.0

8

6.5

10

8.6

2.6

10

14.7

16.1

16.5

0

0

0.0

8.3

3

5.8

2

6.9

154.0

11.5

18

1

SEP

OCT

15.3

19.3

6

11.3

19

8.8

12.2

3

3.4

18

6.5

-1.4

18

11.5

12.8

13.1

0

2

0.0

31.2

14

6.9

7

22.4

97.0

9.2

13

3

OCT

NOV

11.6

16.2

1

5.7

30

6.7

12.2

 19 20

1.5

10

4.4

-2.5

9

8.8

9.6

9.6

0

2

0.0

104.4

24

14.4

28

74.1

93.3

8.0

7

2

NOV

DEC

5.7

12.2

5

0.2

18

1.4

10.4

6

-5.1

19

-0.8

-10.1

19

3.3

5.6

5.7

11

16

138.8

77.7

20

14.5

29

85.2

92.9

6.8

10

6

DEC

YEAR

14.9

X

X

X

X

7.2

X

X

X

X

5.0

X

X

10.5

11.6

11.9

35

72

437.3

624.8

162

X

X

433.7

1813.8

X

X

30

YEAR

Part 2  Air Pressure, Wind Direction, Wind Speed, Humidity, Cloud Cover, Fog, Snow Falling, Snow Lying, Hail & Thunder

 

      P r e s s u r e (mb)

 

Wind Direction 0900 GMT  (No. of Days)

 

 

Wind Speed (MPH)

Humidity(%)

Cloud

      No of Days With:

 

 

 

Month

Mean MSL Pressure

Highest

Date(s)

Lowest

Date(s)

N

NE

E

SE

S

SW

W

NW

CALM

Mean Wind Speed

Maximum Gust

Date

Mean Relative Humidity (5 min.obs.)

Mean Cloud Cover 0900 GMT (oktas)

Fog (visibility < 1000m @ 0900 GMT)

Fog (visibility < 200m @ 0900 GMT)

Snow or Rain and Snow

Snow Lying (> 50% cover @ 0900 GMT)

Hail

Thunder

Month

JAN

1008

1031

   2, 3

963

23

1

1

0

3

10

9

2

2

3

5.3

53

17

93.4

6.7

2

0

3

3

0

0

JAN

FEB

1013

1031

20, 21

975

10

2

2

1

1

2

1

9

8

2

3.8

35

10

90.9

6.5

1

0

8

14

0

0

FEB

MAR

1012

1035

17

976

4

1

1

2

1

2

4

12

8

0

5.9

48

3

81.4

4.6

1

1

1

0

4

0

MAR

APR

1011

1027

20

991

27

6

6

3

2

5

4

4

0

0

3.5

48

8

80.4

5.3

4

0

0

0

0

1

APR

MAY

1016

1032

29

998

15

2

3

5

0

3

9

8

1

0

5.4

45

8

74.3

4.7

0

0

0

0

0

0

MAY

JUN

1016

1028

23

998

7

2

8

3

3

1

2

4

7

0

4.3

33

17

72.3

4.9

0

0

0

0

0

2

JUN

JUL

1010

1023

1

999

23

0

0

1

2

6

13

9

0

0

7.1

33

6 18 29

73.1

5.4

0

0

0

0

0

4

JUL

AUG

1014

1022

22

1002

31

3

0

0

0

9

13

4

2

0

6.4

40

26

73.1

4.5

0

0

0

0

0

1

AUG

SEP

1020

1037

11

990

3

6

6

0

0

1

5

11

1

0

5.7

39

3

74.9

5.0

0

0

0

0

0

0

SEP

OCT

1016

1033

15

995

21

3

0

2

4

8

3

9

2

0

5.1

38

3

80.6

6.1

0

0

0

0

0

0

OCT

NOV

1000

1020

9

982

3

1

1

0

3

10

11

4

0

0

9.3

50

25

84.0

4.8

1

0

0

0

0

0

NOV

DEC

1006

1034

11

983

22

3

4

0

1

6

8

6

2

1

6.4

40

17

89.3

4.8

2

0

7

8

1

0

DEC

YEAR

1011.8

X

X

X

X

30

32

17

20

63

82

82

33

6

5.7

X

X

80.6

5.3

11

1

19

25

5

8

YEAR

Click on the links below to access the graphs and charts representing the data in the above tables.........

1. Monthly Mean Maximum & Minimum Temperatures   2. Monthly Temperature Extremes

3. Monthly Mean Earth (30 cms Depth) Temperature   4. Monthly Frequency of Air & Ground Frost, and Air Frost Duration

5. Monthly Rainfall   6. Monthly Rainfall Duration  7. Monthly Sunshine Duration

8. Monthly Rainfall & Mean MSL Air Pressure  9. Monthly Mean, Highest and Lowest MSL Air Pressure

10. Monthly Wind Direction Frequency @ 0900 GMT 

11. Monthly Maximum Gust & Mean Wind Speed   12. Monthly Mean Relative Humidity

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(This page last updated 20th January 2010 2047 GMT)