New frost-free record for May

Cows in frost at Aberfoyle after this year’s first frost which was recorded in June. Photo by Kiana Lee Blanchard

10th Jun 2025

Information provided by Peter Burr www.weatherarmidale.com/guyra

May 2025 delivered an unusual twist in Guyra’s climate history, with the town recording zero frosts for the month—a new record in 47 years of frost observations.
Traditionally, the frost season begins in late April or early May, but this year, not a single frost was reported by the end of May. The previous record low for May frost occurrences was one frost, recorded in both 1983 and 1991. This year’s complete absence marks a significant deviation from the norm, with up to 10 frosts unusually recorded in May.
The lack of frosts is attributed to an unusually high number of low-pressure troughs affecting northern New South Wales throughout the year. These weather systems brought increased cloud cover, particularly overnight, which prevented the typical radiation cooling that leads to frost formation.
In addition to the absence of frost, overnight minimum temperatures were notably warmer. The average minimum for May was 6.9°C, the highest on record for the month. The previous record was 6.7°C, set in May 1989. The long-term average minimum for May is just 3.8°C, based on 92 years of data.

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New frost-free record for May

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