466 Meteorological Observations for October 1830. 



Mean at 2 P.M. 65°-8.— Mean at 8 A.M. 75°-3.— Mean at 8 P.M. 77-0 



of three observations each day at 8, 2, and 8 o'clock 72 - 7 



Evaporation for the month 1-75 inches. 



Rain in the pluviameter near the ground 0-595 inches. 



Prevailing winds, N.E. and N.W. 



Summary of the Weather. 



A clear sky, 8; fine, with various modifications of clouds, 12; an over- 

 cast sky without rain, 9 ; rain, 2. — Total 31 days. 



Clouds. 

 Cirrus. Cirrocumulus. Cirrostratus. Stratus. Cumulus. Cumulostr. Nimbus. 

 22 8 27 3 15 13 8 



Scale of the prevailing Winds. 



N. N.E. E. S.E. S. S.W. * W. N.W. Days. 

 3 5^ 4 3i 1 4 Al 5h 31 



General Observations. — This has been the finest and driest October that 

 we have had for many years past, but not the warmest. From the 3rd to 

 the 22nd no rain fell here; the atmosphere was often transparent and 

 cloudless, and its elasticity very seldom broken by the wind; therefore the 

 mercury in the barometer maintained a high elevation till the 28th. Both 

 the maximum and minimum temperatures have been comparatively high and 

 low for several days during the month, and were thus influenced chiefly by 

 the position of the prevailing winds. The 19th, 20th, 21st, and 22nd were 

 warm days and nights, but were preceded and followed by a cold air. 



The mean temperature of the external air this month is one-seventh 

 of a degree higher than the mean of October for many years. 



The atmospheric and meteoric phenomena that have come within our 

 observations, are four parhelia, two solar and two lunar halos, fourteen 

 meteors, three auroras boreales, and three gales of wind, namely, two from 

 the West, and one from the North-west. 



REMARKS. 



London.— October 1. Fine. 2. Fine: slight rain at night. 3. Slight rain 

 in the morning : dull. 4, 5. Fine. 6. Cloudy. 7. Fine. 8. Foggy in 

 the morning : fine. 9 — 11. Fine. 12. Cloudy: slight rain at night. 



1 3 — 1 8. Foggy in the mornings : clear and fine through the day. 1 9. Slight 

 rain : fine. 20, 2 1 . Very fine. 22. Fine: rain in the evening. 23. Cloudy. 



24. Cloudy: rain at night. 25. Rain, with brisk wind. 26, 27. Cloudy: 

 rain at nights. 28. Stormy and wet. 29, 30. Fine. 31. Rain in the 

 morning: fine. 



Penzance. — October 1. Misty: fair. 2. Rain. 3. Fair: showers. 

 4 — 10. Fair. 11, 12. Clear. 13. Fair. 14— 16. Clear. 17, 18. Fair. 

 19. Rain: fair. 20, 21. Fair. 22. Rain : fair. 23. Fair. 24. Fair : rain. 



25. Rain. 26. Fan-. 27. Clear: fair. 28. Rain. 29. Showers. 

 SO, 3 1 . Rain : fair. 



Boston. — October 1. Cloudy. 2. Fine. 3. Cloudy: rain early a.m. 

 4. Cloudy. 5. Fine. 6. Cloudy. 7. Fine. 8, 9, Cloudy. 10. Fine. 

 11. Cloudy. 12, 13. Fine. 14. Cloudy. 15 — 18. Fine. 19. Fine: 

 rain at night. 20, 21. Fine. 22. Cloudy: rain p.m. 23. Fine. 24. Cloudy: 

 rain at night. 25. Cloudy: rain a.m. and>.M. 26. Fine. 27. Fine : rain p.m. 

 28. Cloudy : rain p.m. 29, 30. Fine. SI. Rain. 



Meteoro*. 



