EEV. R. F. WHEELER, M.A., AND DE. HOOPPELL. 485 



TEMPERATURE. 



The principal results furnished to the Club, under the head of 

 temperature, have been arranged in two general tables. One of 

 these is concerned entirely with absolute temperatures, that is 

 to say, with the temperatures actually reached and recorded at 

 definite points of time, the other is concerned with daily tem- 

 peratures, that is to say, with temperatures representing the 

 means of those which actually occurred during successive periods 

 of twenty-four hours. 



The construction of the tables will be readily understood. 

 The first gives for each station, and each month in the year, the 

 highest maximum indicated by the thermometer, together with 

 the day on which it occurred, the lowest minimum indicated, to- 

 gether with the day, the difference between the two, or monthly 

 range, the mean of all the daily maxima, the mean of all the 

 daily minima, and the difference between these latter, or mean 

 daily range. The second table gives for each station, and each 

 month, the mean temperature of the warmest clay, that is, of the 

 warmest period of twenty-four hours, reckoned from midnight 

 to midnight, the mean temperature of the coldest day, the differ- 

 ence between them, or monthly range of daily temperature, to- 

 gether with the mean daily temperature throughout the month. 



In each table the average of each column of figures relating to 

 temperature is given for the whole district, and similar particu- 

 lars for Greenwich are given in juxtaposition in order to facili- 

 tate comparison. In computing the average of each column in 

 the second table, the figures for Cresswell and St. John's, Wear- 

 dale, are not included, as they are obtained in a different way 

 from the rest. At all the other stations half the sum of the 

 maximum and minimum temperatures of the day is taken as the 

 mean temperature of the day. At Cresswell and St. John's, 

 Weardale, the actual temperatures observed at 9 a.m. are taken. 

 These are purposely given uncorrected "for diurnal range," be- 

 cause it does not appear certain that the Greenwich tables of 

 diurnal range are applicable to observations made in a district so 

 differently situated and so distant. 



