8 



Summary. 



Temperalure (F.). — Monthly mean, 67.9°. Highest 

 monthly mecau, 70.9° at Lawrence ; lowest monthly mean, 

 (34.8° at Nantucket ; maximum, 100° at Lawrence on the 

 13th ; minimum, 41° at Micldleborough on the 28th ; range, 

 59°; greatest local monthly range, 51° at Lawrence; least 

 local monthly range, 30° at Nantucket; greatest daily range, 

 39° at Lawrence on the 17th ; least daily range, 4° at Ipswich 

 on the 30th, Average temperature for July at Springfield 

 for twenty-four years, 73.2° ; average for July, 1891, 69.6° ; 

 departure, — 3.6°. Average temperature for July at Bos- 

 ton for twenty-one years, 71.0°; average for July, 1891, 

 69.0°; departure, — 2.0°. 



Precipitation. — Average, 3.52 inches; greatest, 6.37 at 

 Springfield; least, 2.09 at Dudley. Average for July at 

 Springfield for forty-four years, 4.50 ; for July, 1891, 6.37 ; 

 departure, + 1.87. Average for July at Boston for twenty- 

 one years, 3.58 ; for July, 1891, 3.73 ; departure, -}-0.15. 



Prevailing Wind. — South-west. 



Thunder-storms. — 2d, 4th, 15th, 20th, 24th, 25th. 



Solar Hahs. — U\\, 9th, 12th, 13th, 17th, 20th, 22d, 

 24th. 



Lunar Halos. — 24th. 



Remarks. 



The weather for the month of July, 1891, for Massachu- 

 setts, as compared with the month in other years, may be, 

 characterized as cool and wet, with an excess of cloudy and 

 rainy days. Both the maximum and minimum temperatures 

 were somewhat below the figures generally recorded, the 

 latter unusually so. On the morning of the 28th, when a 

 large anticyclone or high barometer area lay off the middle 

 Atlantic coast, the thermal mercury ran down to within less 

 than ten degrees of the freezing point of water, but no frost 

 has yet been reported. Low temperatures also occurred on 

 the 10th and 11th and on the 31st. At Springfield, the 

 mean for the month (69.6°) was the lowest July mean ever 

 recorded during a period of twenty -nine years, covering 



