454 METEOKOLOGICAL REPORT, 1871, BY THE 



April. — 



" April and May are the keys of the year." 



Greenwich. — The mean temperature of April was 47'7°, being 

 1»7° higher than the average of 100 years, but lower than the 

 corresponding value in any year back to 1861, when 44*3° was 

 recorded. The result would have been different but for a warm 

 period between April the 12th and 29th, when the daily excess 

 was 4°. 



The mean high day temperature of April was its average. The 

 mean low night temperature of April was higher than its average. 



The daily range of temperature was less than the average 

 by 2°. 



The fall of rain was 1*3 inches in excess. 



The atmospheric pressure increased from 29 "59 inches on April 

 the 3rd to its maximum reading for the month, 30*050 inches, 

 on the 6th, and continued generally about 29*8 inches till the 

 13th ; on the 14th it decreased, and continued, with slight ex- 

 ceptions, to the 19th, when the minimum for the month, 29*08, 

 occurs. From the 20th there were increasing readings till the 

 25th, to a maximum of 29*90 inches, and this was followed by 

 readings decreasing to 29*34 inches on the 29th. The range for 

 the month was 1*042 inches. 



North Sunderland. — A wet, dull, cold month throughout. 



Wallington. — Like the previous months of the year this was 

 marked by a continuance of severe cold. Eain fell on twenty- 

 four days to the amount of 4*78 inches. The highest reading of 

 the thermometer was on the 7th, 58°, and the lowest on the 

 11th, when the thermometer fell to 18°. The low temperature 

 destroyed nearly all the plums and pears upon the wall- trees ; also 

 retarded vegetation considerably several days. The minimum 

 mean temperature for the month was 33*3°, and the maximum 

 mean 49*4°, and the minimum and maximum mean 41*3°. 



Meldon, near Morpeth. — The first eleven days of April were 

 very ungenial. Vegetation was nearly at a standstill until the 

 rain of the 11th, which did much good. There were only two 



