Royston (Iceni) Weather Station

Daily Weather Observations - January 2001

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

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

1. Daily Maximum, Minimum, and Grass Minimum Temperatures

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

3. Daily Earth (30 cms depth) Temperature 4. Daily Rainfall 5. Daily Sunshine

6. Daily Maximum Gust & Mean Wind Speed 7. 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. Hyetograph

.......and for a text report of the January 2001 weather in Royston click on the link below

January 2001 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 (35 years 1961/1995) 51.3 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)

Looking more like the North Pole this is the golf course on Therfield Heath, Royston in very dull conditions on 19th January 2001 at 1543 GMT. After a bright start light snow began to fall in the mid-morning and continued until early afternoon to give a light ground cover. The temperature is 0°C with a light air from the west. The maximum temperature for the day was 1.0°C after an overnight minimum of -1.3°C. The next day, 20th, was dull and foggy all day and the snow did not clear until milder air and rainfall arrived on 21st. The 3 days 20th/22nd were all completely sunless, but by then the sunshine for the month had already exceeded by 10 hours the average for the whole of January!	This picture displays an interesting cloud formation (as seen from the eastern edge of Royston at 0846 GMT on 11th January 2001) shortly after sunrise. The sun, the position of which is just to the right of the photograph behind the darker cloud near the horizon, is illuminating the prominent aircraft contrail. The wind direction is north-easterly and the mean wind speed is 5 knots, with occasional gusts to 14 knots. The temperature is 1.5°C, and was followed by a maximum for the day of 4.3°C, whilst a daily sunshine total of 4.4 hours was recorded. The overnight (10th/11th) minimum temperature was 1.0°C.	On 27th January 2001 at 0947 GMT this was the scene on the Newmarket Road Playing Field in Royston (with Hyde Hill in the background). Rain from mid-afternoon on 26th unexpectedly (i.e. not forecast) turned to heavy snowfall during the evening and quickly covered the ground to a depth of about 5 cm. The area of snowfall appears to have been fairly localised around Royston with areas to both the north and south missing out. With the temperature at 1.9°C, a brisk SW wind of mean wind speed 8 knots, gusting to 18 knots is making it feel rather cold. However, the temperature later managed to rise to 5.2°C in the sunshine (daily total 6.2 hours).

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(This page last updated 8th February 2001 2122 GMT)