Royston (Iceni) Weather Station

Daily Weather Observations - January 2004

(All Times GMT)

Date Max. Temp. (°C) 09/09h Min. Temp. (°C) 09/09h Grass Min. Temp. (°C) 21/09h Earth (30cms) Temp. (°C) 09h Sun (Hours) 00/00h R'fall (MM) 09/09h Wind Dir'n 09h Mean Wind Speed (MPH) 00/00h Max. Gust Speed (MPH) 00/00h Cloud Cover (Oktas) 09h Mean MSL Air Pressure (mB) 00/00h Mean Rel. Humd. (%) 00/00h Mean Temp. (°C) 00/00h Fog (vis. <1000m @ 09h) Fog (vis. <200m @ 09h) Snow or Rain and Snow 00/00h Snow Lying @ 09h (>50% cover) Hail 00/00h Thunder 00/00h Date
1 6.5 1.6 0.5 4.0 0.0 3.4 S 6.6 35 8 1007.2 96.8 4.2 0 0 0 0 0 0 1
2 3.4 2.9 2.5 4.6 0.0 0.0 NE 1.6 21 8 1019.8 93.9 2.0 0 0 0 0 0 0 2
3 5.0 -2.5 -5.6 4.0 0.1 0.9 SE 3.4 21 6 1022.7 91.7 0.3 0 0 0 0 0 0 3
4 7.0 3.3 1.4 3.9 0.7 1.1 W 1.6 18 8 1020.1 92.5 5.4 0 0 0 0 0 0 4
5 10.3 5.0 4.3 4.6 0.0 1.7 SW 3.3 23 8 1016.9 96.3 7.2 0 0 0 0 0 0 5
6 10.8 9.1 8.2 5.6 3.3 0.3 SW 6.3 30 8 1013.2 91.1 8.7 0 0 0 0 0 0 6
7 9.5 5.4 4.4 5.8 2.9 6.0 S 5.3 32 8 1011.5 91.4 7.4 0 0 0 0 0 0 7
8 11.0 7.2 6.6 6.0 1.5 5.9 S 9.6 48 8 993.8 93.8 7.8 0 0 0 0 0 0 8
9 7.8 3.8 2.5 6.0 2.9 0.7 SW 7.0 37 3 1002.0 87.6 5.0 0 0 0 0 0 0 9
10 11.4 3.9 2.1 5.4 0.2 4.7 S 5.5 25 4 1009.1 93.1 7.8 0 0 0 0 0 0 10
11 11.1 10.1 9.4 6.3 3.3 0.4 SW 11.1 46 7 998.7 87.4 8.1 0 0 0 0 0 0 11
12 9.6 4.2 2.7 5.9 0.8 5.6 S 6.1 37 8 995.8 92.0 5.3 0 0 0 0 0 0 12
13 8.4 5.2 4.0 5.8 1.7 0.4 SW 11.9 46 2 987.1 80.6 7.0 0 0 0 0 0 0 13
14 4.0 3.6 2.1 5.4 0.0 10.0 CALM 4.7 35 8 996.4 91.6 2.7 0 0 1 0 0 0 14
15 8.4 1.5 -0.6 4.6 2.5 2.6 SW 8.4 41 1 999.6 90.6 4.7 0 0 0 0 0 0 15
16 6.7 5.9 4.2 4.9 0.4 0.0 W 10.9 48 8 990.4 82.7 5.4 0 0 0 0 0 0 16
17 4.5 0.4 -2.2 4.6 3.5 1.4 W 3.2 28 1 1003.9 94.6 2.1 0 0 0 0 0 0 17
18 7.8 -1.5 -4.9 4.0 5.6 0.6 W 2.6 25 2 1025.4 88.6 1.8 0 0 0 0 0 0 18
19 10.3 3.8 2.9 3.8 0.0 3.8 W 10.7 39 8 1015.3 88.5 8.0 0 0 0 0 0 0 19
20 9.7 8.7 8.2 5.2 0.0 4.5 NW 4.2 35 8 1014.7 97.5 8.9 0 0 0 0 0 0 20
21 8.0 7.2 7.0 6.1 0.0 0.4 NW 1.9 16 8 1019.3 98.0 7.1 0 0 0 0 0 0 21
22 7.5 5.5 5.0 6.3 0.0 6.1 S 3.2 21 8 1014.4 93.6 6.3 0 0 0 0 0 0 22
23 7.9 6.0 4.0 6.4 0.0 4.4 S 2.1 21 8 1012.8 96.1 6.5 0 0 0 0 0 0 23
24 8.1 3.0 1.1 6.4 6.6 0.0 W 3.8 21 0 1014.7 88.6 5.3 0 0 0 0 0 0 24
25 7.1 1.7 -0.7 5.4 6.6 0.0 W 1.9 21 0 1013.4 89.0 3.0 0 0 0 0 0 0 25
26 4.1 0.4 -2.6 4.4 0.0 0.1 NE 0.7 16 8 1005.8 96.7 1.8 0 0 0 0 0 0 26
27 4.0 0.7 -0.9 4.2 4.2 2.7 N 2.9 21 8 1007.9 88.5 1.2 0 0 0 0 0 0 27
28 4.0 -3.0 -5.5 3.9 2.8 4.9 W 5.1 37 0 1002.8 90.0 -0.8 0 0 1 1 0 1 28
29 3.1 -4.5 -8.3 3.5 7.7 TR W 5.0 28 0 1009.5 81.7 -1.1 0 0 0 1 0 0 29
30 10.0 -1.1 -4.4 3.2 0.1 8.0 SW 8.6 35 8 1006.1 85.7 3.2 0 0 0 1 0 0 30
31 12.0 5.5 5.3 3.9 0.1 1.5 SW 15.4 67 8 991.7 91.2 9.6 0 0 0 0 0 0 31
Total/Mean 7.7 3.3 1.7 5.0 57.1 82.1 X 5.6 X 5.7 1007.8 91.0 4.9 0 0 2 3 0 1 Total/Mean
*Diff./% +1.1 +1.2     103% 160%                           *Diff./%

Differences from average:

Differences from average shown in red. Reference periods used are as follows: Temperature 30 Years 1973/2002; rainfall 30 Years 1971/2000; sunshine 30 Years 1971/2000.

(*The differences from average quoted during the course of the month relate to the cumulative daily averages up to the date of the last observation, not the averages for the month as a whole)

Additional Data:

Rainfall Duration  109.7 hours

Air Frost Duration  68.2 hours

Graphs and Charts:

Click on the following links to view this month's graphs and charts.....

1. Daily Maximum, Minimum & Grass Minimum Temperatures 

2. Daily Maximum & Minimum Temperatures (with 30 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 2004 Weather Review:

......and click on the link below for a text report of the January 2004 weather in Royston

January 2004 Weather Review

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

Mean day maximum temperature (30 years 1973/2002) 6.6°C

Mean night minimum temperature (30 years 1973/2002) 2.1°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)

This was the sunrise over Royston on 3rd January 2004, as viewed from Bury Plantation on the eastern edge of the town at 0802 GMT. Instead of the  orange-red colouring usually experienced, this sunrise exhibited a subtle purple tinge, presumably due to the influence of the type of cloud present at the time. A feature of the sunrise was that from its most intense the colouring disappeared very quickly. Despite the omens of 'red sky in the morning' the day was essentially a dry but cloudy one with a maximum temperature of 5.0°C after an overnight minimum of -2.5°C. Sunshine was limited to 1.5 minutes for the day. This rainbow was spotted near the village of Tewin some 24 km SSW of Royston on 16th January 2004 at 1423 GMT. The mainly cloudy and dry conditions that day  would not normally be expected to produce a rainbow, but the combination of a brief sunny interval and a few spots of rain  was sufficient to form this one which is bright right down to ground level. It was a fairly windy day with Royston experiencing a westerly wind of mean speed 10 knots gusting to 24 knots at this time. Only 0.4 hours sunshine for the day was recorded at Royston. (Photograph submitted by Daniel Barker, Stevenage). The first significant snowfall of the 2003/4 winter in Royston occurred overnight 27th/28th January resulting in  a level depth of 4 cm snow being measured at 0900 GMT on 28th. This view over Poor's Land between Royston and Barley was as seen at 1009 GMT on 28th. Despite the sunshine the temperature is -0.9°C, and a westerly wind of 6 knots gusting to 16 knots is inducing a distinct wind chill factor. The sunshine did not last (total for the day 2.8 hours) and by mid afternoon a southwards moving cold front in Artic air introduced blizzard conditions accompanied by thunder and lightning!

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(This page last updated 9th February 2004 2031 GMT)