Meteorological Observations for May 1830. 79 



Clouds. 



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



26 15 25 1 27 22 14 



Scale of the prevailing Winds. 



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

 3' s 2 4 5 1 9 4| 21 31 



General Observations. —The characteristic of this month to the 20th was 

 dry and pleasant, with much warm sunshine; but the last ten days were 

 showery, accompanied with cold westerly gales. The temperature of the 

 air was often variable, and there were several hoar frosts in the first part 

 of the period. The rains that fell here during the last ten days have been 

 of great service to vegetation and the grass lands, and have restored the 

 verdant appearance of the young wheats; for about the 19th the air be- 

 came arid and blighty, and the roads exceedingly dusty, so that vegetation, 

 &c. began to droop. There appears now to be a more abundant show of 

 fruits than could have been expected, from the extraordinary severity of 

 the last winter, and the weather has been favourable to their setting firmly 

 on the trees. ' Great blights, however, may still be seen in many places. 



On the 5th and 21st instant lightning occurred in the evenings, which 

 was brought on by crossing winds; and distant thunder was heard most of 

 the day of the 23rd. None of the heavy thunder-storms that are said to 

 have happened in different parts of the country, have passed over this place. 



The 1 1th, 12th, and 13th, were very cold days, with prevailing North, 

 and North-east winds. 



The mean temperature of the external air this month is a quarter of a 

 degree higher than the mean of May for many years past. 



The atmospheric and meteoric phenomena that have come within our 

 observations this month, are four solar halos, four meteors, lightning on 

 two days and thunder on one, and eight gales of wind, or days on which 

 they have prevailed, namely, one from the North-east, two from the East, 

 three from the South-west, and two from the West. 



REMARKS. 



London. — May 1 — 4. Very fine. 5. Slight rain in the morning: very fine. 

 6, 7. Very fine. 8. Heavy rain at noon: very fine. 9. Cloudy: drizzly. 

 10. Showery. ] 1, 12. Clear, with stormy wind. 13. Cloudy. 14 — 20. 

 Very fine and warm. 21. Sultry, with a heavy thunderstorm at midnight. 

 22. Fine. 23. Fine: overcast, with thunder and rain in the afternoon. 

 24. Very fine. 25, 26. Stormy, with heavy thunder showers. 27, 28. 

 Showery. 29. Fine. 30. Showery. 31. Fine. 



Penzance. — May 1. Clear: showers. 2 — 4. Clear. 5. Fair : clear. 6. 

 Clear : shower. 7. Rain. 8/Fair: showers. 9. Clear : showers. 10,11, 

 12. Fair: a shower. 13. Clear. 14, 15. Fair. 16, 17, 18. Clear: fair. 

 19. Fair. 20. Clear: fair. 21. Fair : rain. 22. Clear : rain. 23. Fair. 

 24. Showers. 25. Fair. 26. Showers: fair. 27, 28. Clear. 29. Clear: 

 rain. 30. Clear. 31. Fair. 



Boston.— May 1. Cloudy. 2— 5. Fine. 6. Rain. 7, 8. Fine. 9. Rain 

 and stormy. 10 — 12. Cloudy. 13. Cloudy: rain early a.m. 14, 15.Cloudy. 

 16. Fine. 17. Cloudy. 18. Fine. 19 — 21. Cloudy. 22. Rain. 2S.Cloudy: 

 rain with thunder and lightning p.m. 24. Cloudy : rain early a.m. : heavy 

 rain p.m. 25, 26. Fine. 27. Rain. 28. Fine: rain a.m. 29. Fine: rain p.m. 

 so. Cloudy: rain p.m. 31. Cloudy. 



Meteor a- 



