Royston (Iceni) Weather Station

2001 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

JAN

5.6

10.5

23

1.0

19

0.9

8.5

2

-5.6

16

-1.5

-9.0

16

2.7

3.2

3.3

12

17

153.4

59.6

13

17.7

26

92.3

95.8

7.5

24

9

FEB

8.2

13.0

11

4.0

27

1.8

10.1

12

-4.0

25

-0.5

-5.6

25

4.2

4.3

4.4

9

17

47.9

90.7

16

21.8

7

85.5

90.5

9.7

25

7

MAR

9.0

16.9

31

2.8

17

2.7

8.4

11

-5.1

3

0.9

-11.1

3

5.1

5.8

6.2

6

12

66.1

87.2

22

12.9

16

105.3

88.4

10.0

30

7

APR

12.6

19.8

2

8.3

20

4.3

9.0

6

-0.5

21

2.4

-3.3

19

7.7

9.5

10.0

2

7

5.7

74.0

23

8.9

14

81.5

119.4

9.5

28

1

MAY

18.9

25.9

11

10.7

17

7.6

16.3

28

1.1

5

5.9

-1.5

5

12.7

14.2

14.9

0

1

0.0

28.1

7

10.1

15

27.1

235.5

15.0

22

1

JUN

20.1

27.6

26

13.7

17

10.2

16.0

27

4.0

3

8.6

1.6

9

14.9

16.8

17.5

0

0

0.0

21.0

8

12.4

16

17.2

216.3

15.7

25

1

JUL

23.3

30.9

29

17.6

19

13.6

19.4

29

7.7

16

11.8

5.0

16

18.0

18.9

19.6

0

0

0.0

59.3

11

23.5

17

35.7

200.5

15.5

4

1

AUG

22.9

30.9

15

16.2

9

13.8

18.5

15

8.9

10

12.3

7.2

28

17.8

19.0

19.5

0

0

0.0

61.5

15

10.3

11

50.4

196.9

14.5

1

4

SEP

17.4

22.0

28

13.6

17

10.1

15.6

2

6.3

17

8.4

4.0

23

13.1

15.4

15.7

0

0

0.0

69.0

16

13.0

28

73.4

112.2

10.4

28

2

OCT

17.1

23.0

13

11.4

21

11.4

14.7

11

8.1

29

9.9

5.8

19

13.5

13.6

13.7

0

0

0.0

137.8

20

51.8

20

72.4

131.2

8.7

30

1

NOV

10.3

14.5

2

4.9

8

5.0

12.0

30

-0.9

10  14 

3.2

-3.8

15

7.0

8.4

8.5

4

7

22.4

42.3

15

7.9

7

51.8

77.3

8.0

1

7

DEC

5.8

12.9

5

1.5

22

1.1

11.0

1

-4.1

15

-1.3

-7.6

31

2.8

5.1

5.0

13

21

161.1

22.7

14

5.0

4

33.6

88.8

6.6

8

7

                                                         

YEAR

14.3

X

X

X

X

6.9

X

X

X

X

5.0

X

X

10.0

11.2

11.5

46

82

456.6

753.2

180

X

X

726.2

1652.8

X

X

48

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

 

MSL Air 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 09h (oktas)

Fog (visibility < 1000m @ 09 GMT)

Fog (visibility < 200m @ 09 GMT)

Snow or Rain and Snow

Snow Lying (> 50% cover @ 09 GMT)

Hail

Thunder

JAN

1008.7

1037

14

977

24

1

5

1

2

4

7

5

0

6

4.0

48

5

92.0

4.6

3

0

3

6

0

0

FEB

1016.5

1043

17

984

  4    5

2

1

0

2

3

5

7

3

5

4.6

53

6

89.4

5.4

5

3

3

1

2

0

MAR

1003.3

1019

 5    6

990

 28  29

5

7

1

4

1

6

3

1

3

4.2

37

31

87.9

5.8

0

0

5

3

1

0

APR

1011.7

1033

13

995

 4    6

7

1

0

1

5

8

3

4

1

5.5

41

5

80.9

5.7

0

0

2

0

8

0

MAY

1018.5

1031

8

996

17

6

11

2

0

0

5

4

3

0

3.2

41

16 17

74.8

4.5

0

0

0

0

1

3

JUN

1016.6

1028

18  19

1002

16

1

2

0

4

3

7

7

6

0

4.1

32

7 30

68.2

5.1

0

0

0

0

0

4

JUL

1012.6

1028

2

993

18

3

3

1

3

1

8

6

4

2

3.4

51

11

73.0

4.8

1

0

0

0

0

1

AUG

1013.3

1027

1

998

7  8  19

4

0

0

4

7

9

5

1

1

3.8

35

8 16

77.2

4.9

0

0

0

0

0

3

SEP

1013.4

1022

17

993

30

2

1

0

2

2

4

4

12

3

4.2

35

30

84.6

5.8

2

1

0

0

0

1

OCT

1011.0

1034

31

987

7

0

0

0

2

13

14

2

0

0

5.9

48

7

89.3

5.3

0

0

0

0

0

0

NOV

1023.9

1042

16

995

8

2

0

0

0

1

9

10

3

5

4.3

39

21 27

88.8

5.4

0

0

2

0

0

0

DEC

1024.9

1042

14

998

25

1

2

0

1

3

3

9

3

9

4.1

46

5 28

91.0

4.7

4

2

4

2

0

0

                                                   

YEAR

1014.5

X

X

X

X

34

33

5

25

43

85

65

40

35

4.3

X

X

83.1

5.2

15

6

19

12

12

12

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 17th January 2002 2106 GMT)