Royston (Iceni) Weather Station

2004 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 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)

Rainfall Duration (Hours)

Total

Highest

Date(s)

No. of Days no sun

Month

JAN

7.7

12.0

31

3.1

29

3.3

10.1

11

-4.5

29

1.7

-8.3

29

4.9

5.0

5.1

5

10

68.2

82.1

25

10.0

14

109.7

57.1

7.7

29

10

JAN

FEB

8.0

16.4

4

2.4

28

3.2

12.0

4

-4.0

26

1.3

-6.1

26

5.0

5.8

5.9

11

13

95.8

39.0

11

14.3

5

46.3

69.1

8.8

25

7

FEB

MAR

10.5

18.5

31

4.8

11

3.6

11.0

16

-3.7

1

1.7

-7.8

1

6.3

6.1

6.6

5

12

19.0

28.2

13

7.3

12

31.8

102.5

10.2

30

4

MAR

APR

14.6

21.7

24

9.0

29

6.0

9.7

28

1.2

11

4.0

-2.6

11

9.6

10.5

11.1

0

2

0.0

71.2

15

15.1

27

71.7

144.9

13.5

24

5

APR

MAY

17.4

24.0

17

11.8

3

8.6

12.4

20

2.4

22

6.5

0.0

22

12.5

14.3

15.1

0

0

0.0

53.3

12

20.7

7

45.1

176.7

14.0

19

3

MAY

JUN

21.5

30.7

8

15.5

1

12.1

16.6

8

5.5

19

10.2

3.2

19

16.3

18.1

19.0

0

0

0.0

25.6

9

9.3

22

30.4

200.8

15.2

7

1

JUN

JUL

21.9

27.9

29

16.7

9

12.5

16.3

16

8.4

7

10.6

5.4

7

16.7

18.4

19.1

0

0

0.0

103.9

15

38.0

7

39.0

186.8

15.0

6

0

JUL

AUG

23.5

30.5

7

18.3

29

14.4

21.1

9

8.9

21

12.5

6.7

31

18.2

19.8

20.4

0

0

0.0

57.0

19

15.5

9

49.2

198.3

12.5

7

0

AUG

SEP

20.6

28.5

5

14.2

24

11.7

15.8

11

5.9

24

9.6

2.1

16

15.4

16.7

17.1

0

0

0.0

16.0

12

3.9

30

22.9

178.4

12.4

4

1

SEP

OCT

14.7

17.3

24

10.0

15

8.2

13.9

23

4.1

9

6.0

0.2

27

10.7

12.4

12.5

0

0

0.0

69.4

15

11.0

3

73.9

108.7

8.8

21

3

OCT

NOV

10.2

14.2

3

3.9

20

5.7

10.4

17

-1.0

20

3.9

-6.1

20

7.4

9.2

9.3

3

8

21.7

57.2

15

28.3

18

76.8

70.5

7.7

13

10

NOV

DEC

8.1

12.7

23

3.1

26

3.4

9.6

23

-2.1

26

1.3

-6.1

20

5.3

6.3

6.4

6

13

50.4

27.3

7

9.7

21

31.4

69.5

6.3

28

8

DEC

YEAR

14.9

X

X

X

X

7.7

X

X

X

X

5.8

X

X

10.7

11.9

12.3

30

58

255.1

630.2

168

X

X

628.2

1563.3

X

X

52

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 09GMT (oktas)

Fog (visibility < 1000m @ 09GMT)

Fog (visibility < 200m @ 09GMT)

Snow or Rain and Snow

Snow Lying (> 50% cover @ 09GMT)

Hail

Thunder

Month

JAN

1007.8

1029

18

981

13

1

2

0

1

7

8

9

2

1

5.6

67

31

91.0

5.7

0

0

2

3

0

1

JAN

FEB

1020.9

1037

9

998

27

4

3

0

0

0

9

3

9

1

4.6

48

8

85.8

5.8

0

0

7

3

1

0

FEB

MAR

1020.1

1039

1

997

20

4

4

1

2

5

8

4

1

2

4.0

71

20

83.9

6.0

1

1

3

0

6

1

MAR

APR

1012.7

1029

24

975

18

6

0

0

3

8

4

2

6

1

3.1

41

   3,4

80.6

5.3

0

0

0

0

4

0

APR

MAY

1016.6

1033

23

976

4

7

4

1

0

4

3

3

9

0

1.4

35

4

78.2

4.9

0

0

0

0

0

2

MAY

JUN

1017.0

1034

13

989

23

0

0

0

1

4

5

13

7

0

3.7

46

23

72.5

4.6

0

0

0

0

1

1

JUN

JUL

1015.3

1027

24

1005

8

0

2

0

2

4

6

15

2

0

2.5

37

3 7

75.6

5.5

0

0

0

0

0

3

JUL

AUG

1009.7

1023

1

993

19

1

2

1

3

2

11

7

3

1

2.5

32

19,30

78.2

4.8

0

0

0

0

0

5

AUG

SEP

1017.9

1036

8

997

14

0

5

0

0

3

10

9

2

1

4.5

44

11,14

77.1

4.1

0

0

0

0

0

0

SEP

OCT

1006.2

1025

31

985

20

0

5

0

4

3

10

5

1

3

3.7

53

21

88.4

5.9

2

0

0

0

0

0

OCT

NOV

1022.1

1038

14

1005

18

2

2

0

2

4

7

10

2

1

2.4

37

17

90.6

5.3

0

0

1

2

0

0

NOV

DEC

1018.9

1033

8

990

17

1

1

2

1

4

15

5

1

1

3.3

41

22

90.5

5.0

2

1

0

0

0

0

DEC

YEAR

1015.4

X

X

X

X

26

30

5

19

48

96

85

45

12

3.4

X

X

82.7

5.2

5

2

13

8

12

13

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 14th January 2005 2105 GMT)