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Advances in Meteorology
Volume 2016 (2016), Article ID 9586150, 9 pages
Research Article

The Study of Frost Occurrence in Free State Province of South Africa

1ARC-Institute for Soil, Climate and Water, Private Bag X79, Pretoria 0001, South Africa
2Risks and Vulnerability Assessment Centre, University of Limpopo, Private Bag X1106, Sovenga 0727, South Africa

Received 5 April 2016; Revised 16 July 2016; Accepted 2 August 2016

Academic Editor: Anthony R. Lupo

Copyright © 2016 Mokhele Edmond Moeletsi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The study investigated the cessation, onset, and duration of light, medium, and heavy frost in Free State province of South Africa using minimum temperatures from 1960 to 2015. Trends in the frost indices were assessed using the Man-Kendall test. Onset of frost varied spatially with earlier onset over the northern, eastern, and southeastern parts. Areas of early onset also experience late cessation of frost resulting in shorter growing period of less than 240 days. The western parts have longer growing period exceeding 240 days due to earlier cessation of frost and relatively late onset of frost. Trends for the frost-free period (growing period) show contrasting negative and positive trends with isolated significant trends.