About the Station

The Trent Climate Station is operated by Dr. Peter Lafleur and Miles Ecclestone, both in the Department of Geography at Trent University. On the northern outskirts of Peterborough, Ontario, the station services Trent faculty and students, local industry and residence and Environment Canada's Daily Climate Data archive. The station has been recording daily temperature and precipitation statistics since 1968 as well as half-hourly statistics of a broad range of meteorological variables since 1992. This site is maintained under Dr. Peter Lafleur's web site, the Blue Lab, to advertise the availability of local meteorological data records to Trent faculty and students. Refer to the Contact/Request Data section for more details. Those making use of the data are encouraged to check out the instrumentation, methods and location information provided below.


Background Information
The Trent climate station was set up by the Biology Department at Trent University and commenced operations in 1968. In the Autumn of that year, the newly created Geography Department took over responsibility for monitoring a number of climatic variables, in particular daily temperature and precipitation. The station is one of many that report to Environment Canada's Daily Climate Data archive. Over the period of manual observations (1968-1991) there were a number of observers, many of them students. Data from the late 1960's and early 1970's provided the basis for the Climatological Record of Peterborough, compiled by Adams (1978). That compilation of local records provided a detailed report on the 1941-1970 period as well as information regarding the location, method of measurement and post-processing of the data set. Since 1992, data have been collected and stored electronically.

Station Locations:
1968 -1981 Trent University, Peterborough
Atmospheric Environment Service station number: 6166455
City of Peterborough, Lot 4, Concession 11
Latitude 44"22' N
Longitude 78"18' W
Elevation 212 m
The station is located on a level section in the centre of an open field. Immediately to the east a NE/SW oriented drumlin rises to an elevation of 236 m. To the west the land falls through a stand of mixed cedars and deciduous trees to the Trent Canal (W.P. Adams, 1978).

Programs:
Twice Daily
- temperature
- precipitation (rain and snow, Nipher Gauge)
Daily Measurements of
- bright sunshine (Campbell Stokes Recorder)
- wind (MSC Anemograph, U.2.A. )
1981-2002 Trent University, Peterborough
Atmospheric Environment Service station number: 6166455
City of Peterborough, Lot 4, Concession 11)
Latitude 44"21' N
Longitude 78"17' W
Elevation 212 m
The station is located at the north end of Ashburnham road (River road) in an open field near the hydro dam, about one kilometre South of Symons campus.

Programs:
1981-1991: Twice Daily
temperature
precipitation (rain and snow, Nipher Gauge)
1991-June, 1999: Hourly
temperature, relative humidity,
precipitation (rain and snow)
solar radiation,
soil temperature (5, 20 and 50 cm below the surface)
wind speed and wind direction July, 1999-2002: Half-hourly
temperature, relative humidity,
precipitation (rain and snow)
solar radiation,
soil temperature (5, 20 and 50 cm below the surface)
wind speed and wind direction


Instrumentation (1992 - 2004)
The following variables are ordered (columnwise) as they appear in requested data files.

Site Name
Header: Site
Units: n/a
Height: n/a
Instrument: n/a
Company: n/a

Time Vector, year
Header: Year
Units: E.S.T.
Height: n/a
Instrument: n/a

Time Vector, day
Header: Day
Units: E.S.T.
Height: n/a
Instrument: n/a

Time Vector, minute
Header: End_Time
Units: E.S.T.
Height: n/a
Instrument: n/a

Air Temperature
Header: AirTemperature_2m_AbvCnpy_HMP
Units: Degrees C
Height: 2.5m
Instrument: Model 207 temperature and relative humidity probe, Campbell Scientific, Inc., 1983. Model 207 probe includes use of a 41004-5 Gill Radiation Shield, Campbell Scientific, Inc. In October 2001, the 207 probe was replace by a model HMP45CF probe (Campbell Scientific, Inc.) Special Notes: Before 1991, daily temperature is derived from the 24 hour minimum and maximum thermometer readings from a Stevenson screen box. From 1992 to 1998 daily temperature is derived from the linear averaging of 24 hourly thermometer measurements made daily. Then in 1999 the method of temperature measurement reverted back to the 24 hour minimum and maximum method. (N.B. Monthly summaries of temperature submitted to MSC/AES were always derived from the 24 hour min/max values).

Relative Humidity
Header: RelativeHumidity_2m_AbvCnpy_HMP
Units: % - the ratio, expressed as a percentage, of the actual water vapour content of a parcel of air to the amount of water vapour that would saturate that parcel of air at the same temperature and pressure.
Height: 1.5m
Instrument: Model 207 temperature and relative humidity probe, Campbell Scientific, Inc., 1983. Model 207 probe includes use of a 41004-5 Gill radiation shield, Campbell Scientific, Inc. This instrument was changed to a model HMP45CF (Campbell Scientific Inc.) probe in October 2001.

Incident Global Solar Radiation
Header: DownwellingShortwaveRadiation_AbvCnpy_LI
Units: W m-2
Height: 1.31m
Instrument: LI200S LI-COR Pyranometer, Campbell Scientific, INC., 1981.

Rainfall
Header: RainfallDepth_AbvCnpy_TEX
Units: mm
Height: 0.42m
Instrument: Tipping bucket rain gauge rainfall. Special Notes: This variable is found in the hourly Trent climate station data files from 1992 to 2001. This parameter comprises of the tipping bucket collection of precipitation alone. This instrument is not meant for measuring snowfall, but will collect runoff from any melting snow that has been sitting inside the orifice, THERFORE, discretion must be used in the use of these hourly values during winter months).

Precipitation (total)
Header:PrecipitationDepth_AbvCnpy_GEONOR
Units: mm
Height: ground level
Instrument: Geonor totalizing precipitation gauge.

Snow Depth
Header: SnowDepth_AbvCnpy_CS
Units: cm
Height: 1.1m
Instrument: Sonic ranging sensor SR50, Campbell Scientific, Inc., 1994.
Soil Temperature, 5cm
Header: SoilTemperature_0.05m_TC
Units: Degrees C
Height: 5cm below the ground surface
Instrument: Copper-Constantan wire thermocouple (wooden dowel).

Soil Temperature, 20cm
Header: SoilTemperature_0.2m_TC
Units: Degrees C
Height: 20cm below the ground surface
Instrument: Copper-Constantan wire thermocouple (wooden dowel).

Soil Temperature, 50cm
Header: SoilTemperature_0.5m_TC
Units: Degrees C
Height: 50cm below the ground surface
Instrument: Copper-Constantan wire thermocouple (wooden dowel).

Wind Speed
Header: WindSpeed_10m_AbvCnpy_GILL
Units: m s-1
Height: 10m
Instrument: Gill Propeller Anemometer, Model 27106, R. M. Young
Company: SELECTABLE SPEED ANEMOMETER DRIVE MODEL 1831.
PROPELLER TORQUE DISC, R. M. Young Company

Wind Vector
Header: WindVector_10m_AbvCnpy_GILL
Units: m s-1
Height: 10m
Instrument: Gill Propeller Anemometer, Model 27106, R. M. Young
Company: SELECTABLE SPEED ANEMOMETER DRIVE MODEL 1831.
PROPELLER TORQUE DISC, R. M. Young Company

Wind Direction
Header: WindDirection_10m_AbvCnpy_GILL
Units: Azimuth
Height: 10m
Instrument: Gill Propeller Anemometer, Model 27106, R. M. Young
Company: SELECTABLE SPEED ANEMOMETER DRIVE MODEL 1831.
PROPELLER TORQUE DISC, R. M. Young Company

Wind Direction Standard Deviation
Header: WindDirectionStandardDeviation_10m_AbvCnpy_GILL
Instrument: Gill Propeller Anemometer, Model 27106, R. M. Young
Units: Azimuth
Height: 10m
Company: SELECTABLE SPEED ANEMOMETER DRIVE MODEL 1831.
PROPELLER TORQUE DISC, R. M. Young Company

Trailer Temperature
Header: 21XTemperature_CS
Units: Degrees C
Instrument: 21X panel temperature, Campbell Scientific.
Logger Power
Header: 21XVoltage_CS
Instrument: 21X data logger, Campbell Scientific.


Contact/Request Data
The Trent Climate Station record of hourly and half-hourly data have been cleaned and are available in one of the following formats: A) comma-delimited monthly files , B) comma-delimited annual files or C) comma-delimited daily statistics for the time period 1 January, 1992 - 1 September, 2004. Longer daily records of temperature, precipitation and snow depth from the Trent Climate Station are available through Environment Canada's Canadian Daily Climate Data archive.

Data are available free of charge to students and faculty members of Trent University. A service charge may be applied to data requests from non-Trent faculty/students. You may submit requests by electronic mail to Dr. Peter Lafleur. Note: provide a detailed explanation of the variables and time span you are requesting as well as a brief description of your affiliation and intentions.

Contact Information
Dr. Peter M. Lafleur
Environmental Science Centre, rm. C127
Phone: (705) 748-1011 ext. 1487
email: plafleur@trentu.ca


References
Adams, W.P., 1978. The climatological record for Peterborough, Ontario. Occasional Paper 6. Department of Geography, Trent University, Peterborough, Canada.

Mekis, E. and W.D. Hogg, 1997. Rehabilitation and analysis of Canadian daily precipitation time series. Atmosphere-Ocean 37(10, 53-85.

Vincent, L.A., X. Zhang, B.R. Bonsal and W.D. Hogg, 2002. Homogenization of daily temperatures over Canada. Journal of Climate 15, 1322-1334.

 

 

 

 

 

 

 

 

 

 

 

General Information
Posted Documents/Data

Trent Climate Station
Department of Geography,
Trent University
Peterborough, Canada

 

 

 

 

 


Station Graphics
Updated July 7, 2005

Data comprising the following figures are derived from the aggregation of meteorological station records in the Peterborough area. Daily temperature values prior to 2004 and precipitation values prior to 1995 are derived from the Adjusted Historical Canadian Climate Data (AHCCD) archive, developed by the Meteorological Service of Canada, Environment Canada (Vincent et al 2002; Mekis et al 1997 see References section above). Afterwards, data are derived from the Trent Climate Station (TCS). Comparison of the TCS and AHCCD temperature and precipitation records during 1968-1994 indicates that the TCS measures systematically higher daily total precipitation, higher daily minimum temperatures and lower daily maximum temperatures by approximately 10, 5 and 6 percent, respectively (see Table 1). TCS daily values are therefore adjusted according to the ordinary least squares regression coefficients derived from the monthly station comparisons outlined in Table 1. TCS daily total precipitation is only adjusted for days with recorded precipitation greater than 0 mm.

Table 1. Comparison of daily minimum temperature maximum temperature and total precipitation for the AHCCD and TCS record, 1968-1994 ( ß1= mulitplier, r2 = coefficient of determination).

  JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Minimum daily temperature ß1 0.98 0.99 0.97 0.89 0.94 0.95 0.97 0.94 0.96 0.92 0.90 0.95
r2 0.92 0.92 0.94 0.94 0.94 0.92 0.90 0.88 0.90 0.89 0.90 0.91
Maximum daily temperature ß1 0.89 0.93 0.95 0.96 0.96 0.95 0.94 0.95 0.97 0.97 0.97 0.93
r2 0.91 0.95 0.96 0.98 0.97 0.96 0.96 0.96 0.97 0.98 0.96 0.91
Total precipitation ß1 0.97 0.88 0.86 0.91 0.95 0.82 0.88 0.87 0.93 0.95 0.96 0.83
r2 0.83 0.76 0.89 0.89 0.90 0.85 0.85 0.85 0.93 0.91 0.95 0.79

 


Figure 1. Mean annual temperature and the 1897-2004 normal annual temperature for Peterborough, Canada.


Figure 2. Annual total precipitation and the 1897-2004 normal annual total precipitation depth for Peterborough, Canada.

 


Figure 3. Daily mean temperature anomalies relative to the 1897-2004/05 normal daily mean temperature for the year previous to the last download day recorded at the Trent Climate Station, Peterborough, Canada.

 


Figure 4. Daily mean temperature (red squares), 1897-2005 normal daily mean and standard deviation (solid lines) and minimum and maximum (broken lines) temperature for the last complete month recorded at the Trent Climate Station, Peterborough, Canada.

 


Figure 5. Daily total precipitation for the last complete month recorded at the Trent Climate Station, Peterborough, Canada.