218 J. noPKixsox — meteoeological obsertattons 



the 1 st to the 1 8th, the temperature for the earlier period being 

 57"-l, and for the later 52°- 6. 



The wind was very unsettled the first eleven days, but most 

 frequently easterly or westerly, from the 12th to the 20tli it was 

 either S. or S.W., south-westerly generally to the 26th, 8. on the 

 27th, and jS^.E. the lust three days. 



There was a slight fall of rain on the 1st, and then none until 

 the Gth, after which the 9th, 30th, and 31st were the only days 

 without rain. 



There were thunderstorms from 4'45 to 7 p.m. on the 1st ; from 

 10 p.m. on the 10th to about midnight, with heavy rain lasting to 

 8-30 a.m. the following day ; on the night of the l7th-18th, with 

 strong wind and heavy rain (0"55 in.); and on the 28th, with 

 0-66 in. of rain. Thunder was heard also on the 26th. The 

 storm of the 1st was unusually severe and was generally felt over 

 the London district, considerable damage being done by hail in the 

 north of London. 



Juke. 



The range in atmospheric pressure was less than in any other 

 month in the year, being only 0o09in. The minimum, 29-686 ins., 

 occurred on the 12th, and the maximum, 30-195 ins., on the 26th. 



The temperature of the air was about the same as in May until 

 the 20th, when a warm period commenced. On the 23rd there was 

 another considerable rise in temperature, and from this day to the 

 29th inclusive the mean was 74''-l, being 13''-8 higher than the 

 mean of the mouth. The maximum was above 80" on every day 

 from the 23rd to the 28th, and it exceeded 70° on five other days. 



The wind was generally easterly to the 9th, 8.W. from the 10th 

 to the 13th, then north-easterly to the 19th, S. for the next three 

 days, then westerly, and S.E. to N.E. from tlie 26th to the end of 

 the month. 



Of the sixteen days of rain fourteen wei'e between the 2nd and 

 19th incliisive, and during this time there was not a longer interval 

 than one day without. After the 19th there was a slight fall on 

 the 26th, and a very heavy one on the 30th. 



There were thunderstorms every few days during the month, 

 some of which were very severe. The days on which I have re- 

 corded them at Watford are the 4th, 8th, 16th, 18th, 23rd, 26th, 

 and 30th. These storms all occurred in the afternoon or evening, 

 and, with the exception of that on the 23rd, they occasioned con- 

 siderable falls of rain. The intense heat which lasted the whole of 

 the week from Sunday the 23rd to Saturday the 29th commenced and 

 ended with thunderstorms of iinusual severity. It is noteworthy that 

 although much damage was done in the neighbourhood of London, 

 especially in the northern districts, by excessive rainfall on the 

 23rd, none fell at AVatfoi'd. The storm on the 26th was most 

 severe in the neighbourhood of llickmansworth, especially at Moor 

 Park and at Batchworth. At Moor Park 1-07 in. of rain was 

 measured, most of which fell between 4 and 5 p.m. The storm was 



