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MetService first indicated on Tuesday that conditions were ripe for the frost to occur and, sure enough, it was delivered.
MetService meteorologist Tui McInnes said conditions had aligned to produce hoar frost across the region.
Hoar frosts occurred when air temperatures were below freezing and that, combined with any moisture in the air, led to that moisture freezing on to any surface it came into contact with, he said.
An overnight low from Tuesday going into yesterday morning of -7.7degC was recorded at the weather station at Alexandra Airport.
The Alexandra and Clyde areas appeared to be the epicentre for cold conditions based on MetService recording stations with the station between Omakau and Alexandra recording a low of -5.8degC overnight while into the Teviot Valley conditions were relatively warmer with 0.2degC recorded in Roxburgh and -2.5degC in Millers Flat.
Oturehua recorded -10.1degC, in Patearoa the mercury fell to -8.4degC, and -8.1degC was recorded in Ranfurly.