Climate Indices File from Agroecological Resource Areas (ARA) Database

CLIMIND.DAT

The data in this file were derived from the 1951-80 climate normals provided by the Atmospheric Environment Service (AES). AES station data were adjusted using a combination of Thiessen polygon routines and expert knowledge to provide one value per ARA. Potential evapotranspiration values were derived from daily temperature normals interpolated from monthly values using Baier and Robertson (1965) formula 1.

Reference: Bootsma and Boisvert (1991).

One record per ARA.

Item Name Description Reporting Units
ARANO ARA Number  
PROV Province  
JANPE January Potential Evapotranspiration mm
FEBPE February Potential Evapotranspiration mm
MARPE March Potential Evapotranspiration mm
APRPE April Potential Evapotranspiration mm
MAYPE May Potential Evapotranspiration mm
JUNPE June Potential Evapotranspiration mm
JULPE July Potential Evapotranspiration mm
AUGPE August Potential Evapotranspiration mm
SEPPE September Potential Evapotranspiration mm
OCTPE October Potential Evapotranspiration mm
NOVPE November Potential Evapotranspiration mm
DECPE December Potential Evapotranspiration mm
YEARPE Annual PE mm

N.B. The following are based on mean daily air temperature, interpolated from monthly normal values using Brooks (1943) sine wave interpolation. All values are rounded to the nearest whole unit.

Item Name Description
GDD>5C Growing Degree Days > 5 degrees C
- accumulated from 10 days after mean daily temp. > 5 degrees C or Apr. 1, whichever is later, to date of mean temp. min. <= 5 degrees C or Oct 31, whichever is earlier
YRGDD>5C Seasonal Growing Degree Days > 5 degrees.
- accumulated from date mean daily temp. > 5 degrees C in spring (GSS) to date mean temp. < 5 degrees C in fall(GSE)
GSS Growing Season Start (Julian day #)
- date mean daily air temp. >= 5 degrees C in spring
GSE Growing Season End (Julian day #)
- date mean daily air temp. <= 5 degrees C in fall
GDD>15C Growing Degree Days > 15 degrees C
- accumulated from time mean temp. > 15 degrees C in spring to time mean temp. < 15 degrees C in fall
ACCCHU1 Accumulated Corn Heat Units (CHUE1)
- CHU for silage corn; from CHUS to CHUE1
ACCCHU2 Accumulated Corn Heat Units (CHUE2)
- CHU for grain corn from CHUS to CHUE2
CHUS Start date for CHU accumulation (Julian day #)
- Date when CHU accumulation starts as determined by when mean temp. >= 9 degrees C (estimated seeding date)
CHUE1 End Date for ACCCHU1 (Julian day #)
- Day when CHU accumulation for silage corn ends; date mean minimum temp. <= 5 degrees C (estimated average date of first fall frost)
CHUE2 End Date for ACCCHU 2 (Julian day #)
- Day when CHU accumulation for grain corn ends; date mean minimum temp. <= 3.6 degrees C (first estimated average date of occurrence of -2 degrees C)
TTLPTU Total Photo-thermal Units
- as calculated in Bootsma and Boisvert (1991)