178 



J. HOPKINSON METEOEOLOGICAi OBSERVATIONS 



The mean temperature of the year was very low. The mean 

 daily range of temperature was about the average. There were no 

 high maxima, the extreme being 79°-8 in June ; but in each of the 

 three winter months there were rather low minima, the lowest 

 being 16°-1 in December. The temperature was below the average 

 in every season, the summer being particularly cold, and the only 

 months in which it was above the average were May and November. 

 While these were comparatively much the warmest months in the 

 year, March and October were comparatively much the coldest, 

 March being l°-2 colder than February, and October being only 

 1°'3 warmer than November. The mean pressure of the atmosphere 

 was slightly above the average of that of the ten years 1877-86 at 

 Watford. The lowest pressure recorded at 9 a.m. was 29*136 ins. 

 on 18th February, and the highest was 30'601 ins. on 31st March, 

 giving a range of 1-465 in. The rainfall was considerably below 

 the average of that of the ten years 1877-86, and a little below a 

 long-period average, but rain fell on nearly the usual number of 

 days. August, September, and October were very wet months ; 

 January and April were very dry. The air had an average 

 humidity, and the sky, except in autumn, was comparatively free 

 from cloud. South-westerly winds were as usual much the most 

 frequent, but southerly winds were less frequent than usual. 



In the winter of 1891-92 (Dec. to Feb.) the mean pressure of 

 the atmosphere was rather low, the mean temperature was low, 

 with a considerable mean daily range, and the rainfall was about 

 the average. In the spring (March to May) the mean pressure 

 was rather high, the mean temperature was low, with a consider- 

 able mean daily range, the air was dry, and the rainfall was very 

 small. In the summer (June to August) the mean pressure was 

 a little above the average, the mean temperature was very low, 

 with an average mean daily range, and the rainfall was about the 

 average. In the autumn (Sept. to Nov.) the mean pressure was 

 almost exactly the average, the mean temperature was low, with 

 a small mean daily range, the air was moist, and the rainfall was 

 heavy. Rain fell on many days in winter and autumn, and on but 

 few in spring and summer. 



The difference between these seasons and the means of the 

 seasons for 1877-86 at Watford is shown in the following table. 



Difference m 1891-92 from Means of 1877-86 at Watford. 



