Meteorological Observations for Jaiiuary 1829. 239 



25th. In the nights of the 19th, 21st, 22ncl, and 24th, the thermometer re- 

 ceded to 24 degrees, and in the night of the 23rd to 21 degrees. The icy 

 efflorescences were pretty tliick on the inside of the glass windows in the 

 niorninTs of the 20th, 22nd, 24th, and 25th. The moats and marslies were 

 firmly frozen by the 21st, and skating was eagerly pursued till the 25th. On 

 the 23rd the thermometer only rose 31 degrees in the clear unobstructed 

 sunshine, being only 3 degrees higher than the maximum temperature 

 of the external air in the shade ; and in the afternoon water froze in rooms 

 where there were fires ; this therefore was a very cold frosty day with a 

 piercing gale from the N.E., and during the twenty-four hours water in an 

 exposed tank froze 1 h inch deep. On the same day in London, the ther- 

 mometer was 6 degrees lower than it was here, and water froze rapidly at 

 noon in apartments with fires. 



At noon of the 25th three currents of wind prevailed, the lower one from 

 the East, the middle one from the North-west, and the upper one from the 

 South. The inosculation of these winds brought down an inch in depth of 

 snow by 9 P.M., which was immediately succeeded by heavy rain, a sudden 

 depression of the mercury in the barometer, and a hard shifting gale through- 

 out the night, which broke up the frosty weather. A difference of 12|^ de- 

 grees in the mean temperature of the atmosphere of any two consecutive 

 months in the year, is very great, which was the case between the present 

 month and last December ; and as it occurred in the coldest season of the 

 year, and with but little difference in the sun's declination, very few per- 

 sons, however cautious they may have been against the effects of such a 

 change, have escaped what is termed a common cold. 



The mean temperature of this month is 3-95 degrees colder tlian the 

 mean of January for the last 13 years. 



The maximum temperature of the air occurred in the nights of the 13th, 

 17th, and 25th, instead of in the days. 



The atmospheric phiaenomena that have come within our observations 

 this month, are eight gales of wind, or days on which they have prevailed; 

 namely, one from the North, four from the North-east, one from the East, 

 one from the South-west, and one from the North-west. 



REMARKS. 



London. — isn. 1,2. Fine. 3. Drizzly: stormy at night. 4. Stormy. 

 5. Fine. 6, 7. Clear and cold. 8. Drizzly : sleet. 9. Cloudy. 10. Fine 

 in the morning : cloudy. 11—13. Stormy. 14. Cloudy in morning : fine. 

 1 5. (Jloudy. 1 6. Clear and frosty. 1 7. Cloudy and cold. 1 8 — 20. Clear 

 and frosty. 21. Clear and cold, with slight fall of snow at noon. 22 — 24. 

 Stormy. 25. Clear and frosty. 26. Drizzly in morning: fine. 27. Fine : 

 drizzly at noon. 28. Fine. 29. Foggy. ."50— 31. Fine. 



Penzance. — Jan. 1. Fair: clear. 2. Fair: showers. 3,4. Showers. 

 5. Hail: showers. 6. Fair. 7. Clear: fair. 8— 10. Fair. 11. Clear. 

 12— 15. Fair. 1 6. Misty : fair. 17. Fair. 18. Rain. 19. Fair. 20. Fair: 

 clear. 21, 22. Clear. 23. Fair. 24. Clear. 25.Fair : rain. 26, 27. Hail- 

 showers. 28. Fair : showers. 29. Rain. 30. Fair. 31. Clear. 



.Boi/on.— Jan. 1. Rain. 2.Fine. 3. Cloudy. 4. Rain. 5. Fine: hail- 

 storm A.M. 6. Snow. 7. {'loudy. 8. Fine. 9. Cloudy : rain at night. 



10. Snow : rain at night. 1 1. Cloudy. 12. Cloudy : rain r.M. 1 3. Cloudy. 



14. Fine. 15, 16. Cloudy. 17. Fine. 18. Foggy. 19. Fine. 20. Fine: 



snow at night. 21. Cloudy. 22. Fine. 23. Stormy. 24. Snow. 25. Misty. 



26. R:iin and stormy. 27. Cloudy : rain at night. 28, 29. Cloudy. 30. l<'ine. 



31. Cloudy. 



Meleoro- 



