00000cam 2200000zi 4500 9.958652 CaOODSP 20251230164417 m o d f cr bn||||||||| 251230e19600421onc ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-on En58-27/6-60E-PDF Growing degree days as an indicator of spring. [Toronto, Ontario] : [Meteorological Branch, Department of Transport], April 21, 1960. 1 online resource (2 unnumbered pages). text txt rdacontent computer c rdamedia online resource cr rdacarrier CDS ; #6-60 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "During the past year, papers by Boughner and Kendall and Holmes and Robertson have been published on the subject of growing degree days and the growth of vegetation. It has been pointed out that the amount of growth in many plants is roughly proportional to the accumulated excess of the mean daily temperature over a threshold value of 42° F. We are further reminded that temperature is only one of the primary factors controlling the growth of plants, and that water supply, light and soil type are also important. In southern Ontario, however, where the light factor in spring is constant over the area and in most years there is an ample water supply for growth, temperature is usually the most important variable, and the response of vegetation to temperature is usually readily apparent"--Page [1]. Atmospheric temperature Ontario Toronto Observations. Degree days Ontario Toronto. Vegetation and climate Ontario Toronto. Température atmosphérique Ontario Toronto Observations. Degrés-jours Ontario Toronto. Végétation et climat Ontario Toronto. Toronto (Ont.) Climate. Toronto (Ont.) Climat. Canada. Meteorological Branch, issuing body. CDS ; no. 6-60. (CaOODSP)9.932874 PDF 260 KB https://publications.gc.ca/collections/collection_2025/eccc/en58/En58-27-6-60-eng.pdf