Royston (Iceni) Weather Station

Daily Weather Observations - January 2002

Date Max Min Grass Earth Sunshine Rainfall Wind Mean Max Cloud Mean Mean Mean Fog Fog Snow Snow Hail Thunder Date
  Temp Temp Min (30cm) (Hrs) (MM) Direc- Wind Gust Cover MSL Rel. Temp (vis.< (vis.< or Lying 00/00h 00/00h  
  (°C) (°C) Temp Temp 00/00h 09/09h tion Speed Speed (Oktas) Pressure Humd (°C) 1000m) 200m Rain/ (>50%      
  09/09h 09/09h (°C) (°C)     09h (mph) (mph) 09h (mb) (%) 00/00h 09h 09h Snow cover    
      09/09h 09h       00/00h 00/00h   00/00h 00/00h       00/00h 09h)      
                                         
1 3.9 -3.2 -7.7 2.5 6.59 0.0 SW 1.6 14 0 1038.5 88.2 -1.3 0 0 0 0 0 0 1
2 2.2 -3.4 -7.9 2.3 6.64 0.0 SE 3.3 25 1 1032.2 89.7 -0.9 0 0 0 0 0 0 2
3 3.4 -0.3 -3.1 2.0 6.93 0.0 SE 3.6 30 1 1028.7 88.4 0.5 0 0 0 0 0 0 3
4 4.9 -3.5 -6.0 2.0 6.76 0.1 SE 2.6 18 0 1029.3 87.6 -1.0 0 0 0 0 0 0 4
5 7.1 1.0 0.6 1.9 0.00 0.5 S 5.6 18 8 1034.9 99.3 4.9 0 0 0 0 0 0 5
6 6.7 3.9 3.1 1.9 0.00 0.3 W 0.9 12 8 1036.8 99.2 5.2 1 1 0 0 0 0 6
7 5.4 4.0 3.0 2.0 0.00 0.1 S 0.5 9 8 1035.0 96.5 4.2 0 0 0 0 0 0 7
8 3.5 2.4 0.0 2.6 0.00 TR CALM 0.1 9 8 1033.7 92.3 2.6 0 0 0 0 0 0 8
9 4.6 0.5 -2.0 2.9 4.79 0.1 CALM 2.3 18 0 1034.5 94.1 2.0 0 0 0 0 0 0 9
10 5.5 2.5 1.4 3.0 0.60 2.9 SE 1.2 14 8 1029.9 97.1 3.8 1 0 0 0 0 0 10
11 6.1 1.1 0.4 3.5 3.03 0.1 W 4.6 23 8 1028.9 96.4 2.5 0 0 0 0 0 0 11
12 8.0 3.6 2.2 3.6 3.26 0.0 S 6.3 28 3 1028.8 95.9 5.1 0 0 0 0 0 0 12
13 10.0 6.0 5.0 4.1 0.10 0.0 S 5.7 25 8 1023.7 98.1 7.7 0 0 0 0 0 0 13
14 9.9 8.4 7.4 5.0 0.20 1.3 SW 6.1 25 8 1021.8 95.3 8.9 0 0 0 0 0 0 14
15 8.8 7.0 5.5 5.7 1.91 0.0 W 4.5 18 8 1015.9 91.9 6.2 0 0 0 0 0 0 15
16 8.5 2.0 -1.0 5.1 1.66 0.0 SW 6.5 23 5 1020.4 91.0 4.6 0 0 0 0 0 0 16
17 9.3 7.5 6.1 5.1 0.00 4.2 SW 6.5 35 8 1016.0 94.2 7.3 0 0 0 0 0 0 17
18 8.5 1.9 -0.1 5.2 3.47 0.5 S 6.8 32 1 1016.1 92.9 4.5 0 0 0 0 0 0 18
19 10.3 5.9 3.1 5.0 7.17 0.0 SW 10.4 32 0 1011.2 84.9 6.7 0 0 0 0 0 0 19
20 13.0 5.5 3.9 5.0 0.00 0.3 SW 13.2 44 8 1009.6 91.4 9.8 0 0 0 0 0 0 20
21 12.3 11.5 10.5 6.1 0.08 0.0 SW 10.7 37 8 1006.7 88.9 10.7 0 0 0 0 0 0 21
22 9.5 7.9 6.2 6.5 4.63 1.4 SW 10.1 37 7 1001.8 83.5 7.7 0 0 0 0 0 0 22
23 11.1 6.5 4.9 6.3 0.14 4.2 S 9.5 37 8 989.8 92.3 8.8 0 0 0 0 0 0 23
24 9.1 8.0 5.8 6.8 0.33 0.1 W 8.4 39 8 996.8 83.4 6.8 0 0 0 0 0 0 24
25 11.4 1.6 -1.6 6.1 0.00 5.2 S 8.2 46 8 1011.0 90.1 5.5 0 0 0 0 0 0 25
26 11.1 8.4 6.4 6.4 0.11 7.2 SW 14.0 51 8 999.2 89.4 9.5 0 0 0 0 0 0 26
27 13.5 7.2 5.5 6.9 0.00 1.4 S 9.1 41 8 1003.3 92.4 9.7 0 0 0 0 0 0 27
28 11.5 9.9 7.5 7.5 5.28 TR SW 16.5 58 3 1011.3 78.7 10.2 0 0 0 0 0 0 28
29 13.0 7.8 5.4 7.1 2.12 0.0 SW 10.2 41 5 1018.8 85.3 9.8 0 0 0 0 0 0 29
30 12.4 8.9 7.2 7.3 0.01 2.1 SW 9.2 35 8 1011.6 91.8 10.0 0 0 0 0 0 0 30
31 11.3 4.7 2.7 7.5 2.18 1.2 SW 11.7 46 6 1010.6 84.3 7.6 0 0 0 0 0 0 31
                                         
Mean/Total 8.6 4.4 2.4 4.7 67.99 33.2 X 6.8 X 5.7 1018.9 91.1 5.8 2 1 0 0 0 0 Mean/Total
  (+2.2) (+2.5)     (125%) (65%)                            

(*All times GMT*)

Additional Data:

Rainfall Duration 44.5 hours; Air Frost Duration 40.6 hours.

Differences from average:

Differences from average shown in red. Reference periods used are as follows: Temperature 25 Years 1973/1997; rainfall 30 Years 1971/2000; sunshine 30 Years 1961/1990.

Observations practice:

Note: In line with standard meteorological practice the 24 hour maximum temperature and rainfall are read at 0900 GMT and credited to the previous day i.e. data shown above for 1st actually read at 0900 GMT on 2nd and represents the previous 24 hours. The 24 hour minimum and grass minimum temperatures are similarly observed at 0900 GMT but are credited to the day of the reading (e.g. observations made at 0900 GMT on 2nd shown against 2nd and represent previous 24 hours). This is the reason why at daily update of the above table the minimum and grass minimum temperatures appear to be "ahead" of the other data mentioned. (This explanation given in response to a query received).

Graphs and Charts:

Click on the links below to view this months graphs and charts.......

1. Daily Maximum, Minimum & Grass Minimum Temperatures 

2. Daily Maximum & Minimum Temperatures (with 25 Year Comparative Means) 

3. Daily Earth (30 cms Depth) Temperature @ 0900 GMT  4. Daily Rainfall  5. Daily Sunshine 

6. Daily Maximum Gust & Mean Wind Speed  7. Daily Wind Direction @ 0900 GMT

8. Daily Mean MSL Air Pressure 9. Daily Mean Relative Humidity 

10. Thermograph  11. Barograph  12. Hygrograph 13. Anemograph 

14. Wind Direction 15. Sunshine Duration 16. Rainfall Intensity & Duration 

January 2002 Weather Review:

....and click on the following link for a text report of the January 2002 weather in Royston

January 2002 Weather Review 

January (since 1973) at Royston (Iceni) Weather Station:

Mean day maximum temperature (25 years 1973/1997) 6.4°C

Mean night minimum temperature (25 years 1973/1997) 1.9°C

Highest temperature 14.2°C (6th January 1999); lowest temperature -12.7°C (14th January 1982)

Lowest grass minimum temperature -18.1°C (10th January 1982)

Warmest January 1983, 1990 (Mean temperature 6.9°C); coldest January 1979 (Mean temperature 0.1°C)

Average January rainfall (30 years 1971/2000) 51.2 mm

Wettest January 1995 (Rainfall 108.2 mm); driest January 1987 (Rainfall 9.6 mm)

Wettest Day 9th January 1992 (Rainfall 25.1 mm);

Highest number of "rain days" (0.2 mm or more) 25 (1988); lowest number of "rain days" 9 (1992)

Highest number of days with thunder 1 (1974, 1984. 1988, 1994 and 1998)

Highest number of air frosts 20 (1979, 1985)

Highest number of ground frosts 25 (1979)

Highest number of days with snow falling 15 (1985)

Highest number of days with snow lying (ground with more than 50% snow cover @ 0900 GMT) 17 (1985)

Golfers are enjoying the first round of the year in this view on Therfield Heath, Royston photographed at 1234 GMT on 1st January 2002. The New Year commenced with a day of unbroken sunshine (which, in fact, continued for the first 4 days of January) which registered a total of 6.6 hours for the day. Despite the brilliant sunshine and a temperature of 3.1°C patches of frost are still in evidence after an overnight minimum temperature of -3.2°C. This eastwards looking view (towards Barley) from Eagle Tavern, Royston depicts a frostbound landscape at 1017 GMT on 2nd January 2002. A light breeze from the ESE of mean speed 2 knots, gusting to 12 knots, is drifting across the landscape in the early morning sunshine (total for the day 6.6 hours). The temperature is -1.3°C, rising from an overnight minimum of -3.4°C, and later achieving a maximum of 2.2°C. On the morning of 16th January 2002 a fine display of wave type clouds followed the sunrise, this photograph being taken to the east of Royston at 0922 GMT. The wind is of mean speed 6 knots, gusting to 12 knots, and its direction is from the SSW. The temperature has risen from its overnight minimum of 2.0°C to 2.7°C and continued a gradual rise throughout the day and evening to 7.9°C by midnight. Sunshine for the day was 1.7 hours.

Return to Welcome to Royston (Iceni) Weather Station page

(This page last updated 10th February 2002 2338 GMT)