TITLE
      Daily Mean Temperature Data

PRINCIPAL INVESTIGATOR
      Amey Bailey
      USDA Forest Service
      Hubbard Brook Experimental Forest
      West Thornton, NH
      Telephone: (603) 726-8902

BEGIN DATE
      January 1, 1956

END DATE
      On-going

LOCATION
       Weather Stations 1, 6, 14, 17, 23, 24, integrated plots (INT), and adjacent to the Headquarters building (HQ)

DATA DESCRIPTION
       Daily mean temperatures from up to 8 locations at HBEF have been measured since October, 1955 using mechanical hygrothermographs in weather shelters.

SAMPLING DESIGN
       Air temperature is currently measured at 8 locations. Six locations are in rain gage openings 1, 6, 14, 17, 23, and 24. One location is Headquarters. The INT station is below the forest canopy (not in an opening) at the integrated plot area, west of weir 4. At each station, air temperature (and usually relative humidity) are recorded by Belfort hygrothermographs housed in standard Stevenson screens, 5 feet off the ground. Each screen also houses a maximum, a minimum, and a standard thermometer. The hygrothermograph charts are changed weekly, at which time the thermometers are read. Daily maximum and minimum temperatures are read manually from the charts. Correction for disagreement with the thermometers are seldom made as agreement is usually within 2 degrees F. The hygrothermographs are readjusted annually to give the daily mean. The daily maximum and minimum temperatures are entered directly into the computer. Maximum and minimum temperatures are converted from Fahrenheit to Celsius and then averaged to give the daily mean.

ACCESS
      Public

DATA LOCATION
      USDA Forest Service, Durham, NH

LAST UPDATED
      August 5, 2002

CONTACT PERSON
      John Campbell
      PO Box 640
      Durham, NH 03824
      Telephone: (603) 868-7643
      E-mail: jcampbell@lternet.edu

VARIABLES
ColumnVariableDescriptionUnitsCoded Missing Value
1DateSample dateyymmddnnone
2Station 1Measured at station 1degrees Cn-99.0
3 Station 6Measured at station 6degrees Cn-99.0
4 Station 14Measured at station 14degrees Cn-99.0
5 Station 1AMeasured at station 1degrees Cn-99.0
6HQ Measured at the headquaters buildingdegrees Cn-99.0
7 Station 23Measured at station 23degrees Cn-99.0
8 Station 17Measured at station 17degrees Cn-99.0
9 Station 24Measured at station 24degrees Cn-99.0

NOTES
       Comparisons among stations should be made with caution because data have not been corrected for possible instrument bias. -99.0 is the missing value when the weather station is not operating. Otherwise if a day is missed, the value for that day has been estimated from values at the other stations. Estimated values are not flagged. The Fahrenheit to Celcius conversion and rounding to whole degrees Centigrade leads to considerable underrepresentation of -5, 0, 5, 10, etc. values.

DATA FILE NAME(S)
      tdmYYYY.txt