Royston (Iceni) Weather Station

2011 Annual Summary

Part 1 Temperature, Rainfall & Sunshine

           T e m p e r a t u r e (C)

 

      Rainfall (mm)

     Sunshine (Hrs)            

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 09 GMT

Mean Earth 30cms 21 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)

Total

Highest

Date(s)

No. of Days no sun

Month

JAN

6.4

12.8

13

1.5

21

2.6

11.1

14

-4.1

29

0.9

-7.2

29

4.2

4.8

5.0

10

16

57.3

73.5

20

16.2

17

42.7

7.5

31

12

JAN

FEB

9.2

14.5

25

3.7

28

4.5

11.0

5

-2.9

1

3.0

-5.1

1

6.7

5.9

6.2

1

5

6.8

31.5

14

5.1

10

55.6

8.6

8

12

FEB

MAR

11.6

17.8

23

3.5

1

3.5

9.4

22

-2.5

8

1.3

-7.5

8

6.9

7.1

7.6

5

11

21.8

4.4

5

2.8

30

134.4

11.4

24

4

MAR

APR

19.2

27.1

23

11.8

13

7.3

11.8

6

2.5

10

4.1

-2.0

28

12.4

12.0

12.8

0

3

0.0

4.8

3

2.5

3

228.7

13.5

30

0

APR

MAY

19.0

24.0

6

15.0

15

8.5

14.6

8

0.5

3, 4

6.3

-3.9

4

13.3

14.7

15.5

0

2

0.0

19.2

8

5.9

26, 30

230.7

14.6

24

0

MAY

JUN

20.7

31.5

27

14.6

6

10.6

17.8

27

7.4

10

8.9

3.7

1

15.1

16.6

17.5

0

0

0.0

61.3

15

9.5

28

210.3

14.4

14

0

JUN

JUL

21.4

25.8

31

17.0

13

11.5

14.4

16

7.7

22

9.7

4.6

30

15.9

17.8

18.7

0

0

0.0

36.2

12

11.9

16

173.6

12.0

24

0

JUL

AUG

21.2

29.8

3

14.1

18

12.4

16.0

2, 3

8.7

19

10.4

6.0

19

16.2

17.6

18.3

0

0

0.0

50.7

16

10.6

18

133.6

11.5

19

1

AUG

SEP

21.4

28.7

30

17.9

7

12.3

16.5

10

8.0

18

10.3

4.4

15

15.9

15.8

16.4

0

0

0.0

15.4

10

5.4

4

196.6

12.5

1

0

SEP

OCT

17.5

29.0

1

12.0

27

10.1

17.5

2

1.9

20

13.0

-1.2

20

13.1

13.0

13.3

0

1

0.0

21.8

11

6.3

8

175.4

10.6

1

1

OCT

NOV

12.7

17.0

3

9.4

23

7.9

13.1

3

1.6

28

6.3

-0.9

28

9.8

10.3

10.4

0

2

0.0

30.7

10

22.3

3

85.8

7.5

19

6

NOV

DEC

8.7

13.7

26

2.9

16

4.0

10.9

26

-1.7

18

2.3

-4.2

19

6.0

6.0

6.2

3

9

16.6

60.4

21

10.0

12

74.7

6.6

22

3

DEC

YEAR

15.8

X

X

X

X

7.9

X

X

X

X

6.4

X

X

11.3

11.8

12.3

19

49

102.5

409.9

145

X

X

1742.1

X

X

39

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 09 GMT (oktas)

Fog (visibility < 1000m @ 09 GMT)

Fog (visibility < 200m @ 09 GMT)

Snow or Rain and Snow

Snow Lying (> 50% cover @ 09(GMT)

Hail

Thunder

Month

JAN

1017.5

1039.7

21

985.4

8

4

3

2

0

5

7

7

3

0

6.5

35

5, 15

89.1

6.9

1

0

0

0

0

0

JAN

FEB

1013.0

1034.3

1

987.7

15

1

1

2

2

11

6

4

1

0

8.1

51

4

89.0

6.8

2

0

0

0

0

0

FEB

MAR

1021.7

1041.2

23

995.7

13

3

6

4

1

5

7

2

3

0

5.1

44

31

80.9

5.5

1

1

0

0

0

0

MAR

APR

1019.2

1029.6

12

1006.2

2

6

6

3

0

4

5

3

3

0

5.2

40

5

72.4

4.0

0

0

0

0

0

0

APR

MAY

1017.1

1027.8

24

1003.4

26

0

2

1

2

6

9

7

4

0

7.4

40

23

69.0

4.4

0

0

0

0

0

2

MAY

JUN

1014.6

1034.5

3

995.6

17 18

1

5

0

1

3

9

8

3

0

6.7

32

21

76.4

4.9

0

0

0

0

0

2

JUN

JUL

1012.7

1026.5

1

990.9

17

8

1

1

1

4

5

3

8

0

5.2

34

8

74.7

5.3

0

0

0

0

0

1

JUL

AUG

1012.3

1025.7

10

999.7

6

1

4

0

1

3

9

10

3

0

5.6

33

27

77.0

6.0

0

0

0

0

0

1

AUG

SEP

1012.6

1028.9

27

998.0

12

0

0

1

3

5

15

5

1

0

7.8

47

12

78.1

4.1

0

0

0

0

0

0

SEP

OCT

1016.1

1032.0

14

992.5

25

0

0

2

5

6

9

7

2

0

7.7

39

10

80.2

4.2

0

0

0

0

0

0

OCT

NOV

1016.5

1029.7

12

989.4

4

1

2

5

6

10

3

3

0

0

5.9

40

27, 29

90.2

6.0

5

0

0

0

0

0

NOV

DEC

1010.2

1033.8

27

980.6

16

0

0

0

0

2

19

9

1

0

10.6

49

13

85.6

4.9

2

0

2

1

0

0

DEC

YEAR

1015.3

X

X

X

X

25

30

21

22

64

103

68

32

0

6.8

X

X

80.2

5.3

11

1

2

1

0

6

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 19th February 2012 2116 GMT)