16 
Greatest number of consecutive days on which rain fell: 11, 7th-to 
17th March. 
Greatest number of consecutive days on which no rain fell: 14, toth to 
24th May. 
Sunniest day of the year, 14°75 hours on 7th July, being 90 per cent. of 
the greatest possible amount. 
Welsh hills at 9 a.m.—These were only visible on 137 days, a little more 
than one-third of the year; 74 days clearly, and 31 very clearly seen. 
EXPLANATIONS. 
Local Mean Time is used for the regular observations. 
The Barometer readings, taken at 9 a.m. and 9 p.m., are corrected and 
reduced to sea-level and 32:0° Far. 
The Approximate Mean Temperature is the mean of the maximum and 
minimum read at 9-0 a.m., and found by multiplying their difference by the 
Meteorological Office co-efficient, and adding the product to the minimum. 
Temperature in Sun read at 9-0 a.m. and placed to previous day. 
Ground Temperatures read twice daily at 9 a.m. andg p.m. The lowest 
reading for the 24 hours, prior to 9 a.m., is entered to the previous day. 
Underground Temperatures taken daily at 9 a.m. The air temperature 
is given for purposes of comparison. 
The Relative Humidity is calculated by dividing the mean elastic force 
of Aqueous Vapour, at the temperature of the Dew Point (as determined by 
Glaisher’s Factors), by that corresponding to the temperature of the air 
(t.e., the Dry-bulb reading). 
The Rain is measured at 9 a.m., and the amount entered to the previous 
day. A fall of 0.006 inch and above constitutes a day of rain. When any 
snow falls, the day is counted as a day of snow. 
When the mean of the 9 a.m. and g p.m. observations of the amount of 
cloud is less than 2:0, it is called a day of clear sky; if the mean is above 
8-0 an overcast day. 
The Wind direction is taken by means of a Compass Nephoscope, from 
the drift of the lower clouds. 
When the Force of the Wind is 7 and above (on Beaufort’s Scale o—12), 
it is accounted a Gale. 
Sunshine Reeord.—The photographic traces are fixed before being 
measured. 
Fog, &*c.—The fog, haze, &c., are made from the visibility of objects 
and lights at definite distances from Rutland Cottage. 
As the tables give the meteorological elements for the year 1905 only, 
it is desirable to add a comparison of the winter and spring months of the 
present year in brief. 
