Some people seemed surprise to see frost advisories out “this early”, especially in Nova Scotia. Those advisories were warranted – many maritimers in all three provinces, woke up to frost yesterday morning. It wasn’t quite as cool this morning but it will be cooler tomorrow, so advisories are back on!
It’s a little bit early, but not unheard of. In fact, if you think back to 2014, many of you were crying over lost crops! No, not eaten by deer…but kissed by frost.
In the early am hours of August 30th, yes August, temperatures dropped to the freezing mark across eastern and northern mainland NS. It had been very warm and humid on the 28th. The following day, a cold front swept the region with showers and thundershowers. The line of weather brought relief from the oppressive weather, but it also pulled the jet stream down behind it. Clouds slowly cleared on the 29th and by the early morning hours of the 30th, a dry air mass sat overhead. Dry air and light winds contributed to a rapid drop in temperature. By sunrise, official temperature readings taken 1.5 m above the ground ranged from 0.5 to 0.9 in many locations. Since cold air is heavy and skinks to the ground, many people reported patchy ground frost.
So is it really too soon for frost?
Here are the average first frost dates for the provincial capitals:
Fredericton: September 22nd
Halifax: October 20th
Charlottetown: October 9th
A word to the wise: cover up your petunias before you crawl into bed tonight!
PS ..and for you Craig, we have had frost in Halifax before October 20th. Sept 28th 1989 the temperature, more than 1m above the ground was -1!