Meteorological Observations for January 1830. 239 



The maximum temperature of the external air on the 17th was five de- 

 grees below the freezing point, and the minimum temperature in the night 

 of the 18th was fourteen degrees below that point. 



There was a recurrence of hard frosts and snow on the last three days, 

 and the 31st was the coldest day since January 14th, 1820: the mean tem- 

 perature of the twenty-four hours for each of these days was only 20'3 de- 

 grees. 



It appears from various published reports, that the cold in the South of 

 France and in Spain has long prevailed, and been more severe than has 

 been experienced there for a great number of years; but that in Scotland 

 and places in a higher north latitude, although they have had very deep 

 snow, yet it has been found comparatively mild for a winter like this ; 

 therefore the rigour of the frosty air seems to have been confined within 

 the parallels of fifty-five and thirty-eight degrees of north latitude, with 

 prevailing North and North-east winds from over the continent of Europe. 

 Ireland being within tiiese parallels, it is curious that its inhabitants should 

 at the same time also have enjoyed a mild atmosphere. 



The mean temperature of the air at this period is 1°44 lower than that 

 of any month during the last fourteen years j nor has tiiere been so long 

 a continuance of severe frosts since the winter of 1813 and 1814. 



The atmospheric phenomena that have come within our observations 

 this month, are, one lunar halo, and four gales of wind, or days on which 

 they have prevailed ; namely, one from the North, two from the North- 

 east, and one from the South-east. 



KEMARKS. 



London.'' — January 1. Hazy : clear and frosty at night Ca slight covering 

 of snow on the ground), 2. Hazy and cold. s. Snow nearly gone: foggy; 

 rain at night. 4 — 6. Foggy. 7.P"ine: clearandfrosty. 8. Stormy. 9. Very 

 fine: stormy at night. 10. Clear and stormy. 11, 12. Stormy, with heavy 

 snow-showers. 13. Stormy: the snow four inches deep. 14. Stormy. 

 15. Foggy. 16. Slight fog in the morning: clear and cold. 17. Hard frost. 

 18. .Strong iioar-frost : cloudy. 19. Cold and cloudy : strong gale at night, 

 with snow. 20. Heavy rain. 21. Clear and colil : lioisterous gale at night. 

 22, 23. Stormy, with showers of sleet. 24, 25. Cloudy. 26. Drizzly morn- 

 ing : foggy. 27. Rainy. 28. Cloudy: sleet. 29. Cloudy. 30. Stormy: rain. 

 31. Cold and cloudy. Snow almost gone. 



Penzance. — January 1 — 5. Fair. 6. Clear. 7. Fair: showers. 8. Fair. 

 9, 10. Fair: showers. 11. Rain: showers. 12. Fair. 13, 14. Snow. 

 15— IS. Fair. 19. Fair: rain. 20. Snow. 21 — 23. Fair: rain. 24. Fair : 

 rain at night. 25. Fair. 26. Clear : rain at night. 27, Clear : hail-shov;ers. 

 28, 29. Clear. 30. Rain. 31. Fair. 



Boston. — January 1 — 4. Cloudy. 5 — 9. Fine. 10 — 12.Stormy. 13,14. 

 Cloudy. 15. Snow. 16. Rain. 17. Cloudy. 18, 19. Fine. 20. Snow, 

 and ^stormy: rain a.m. and p.m. 21 — 26. Cloud}'. 27. Snow. 28,29. 

 Cloudy. 30. Rain. 31. Cloudy. 



Average heat of January 1824 3()-3 



Do. " 182.5 37-4 



Do. ]82() 30-8 



Do. 1827 32!) 



Do. 1828 39-3 



Do. 1829 32-5 



Do. 1830 31-6 



Mctvoro- 



