Frosts 2018

[NZ Thunderstorm Soc]

Frost here this morning, down to minus 1.6C around 8am.

[NZ Thunderstorm Soc]

Might of been a frost here pre-dawn as the overnight minimum was minus 1.1C. Up to 1.7C at 8am , with NW high cloud cover gradually clearing away.

[NZ Thunderstorm Soc]

Frost here this morning, down to minus 1.3C.

[Richard]

Coldest it got to overnight was at 12.20am with -1.8deg, then warmed to sit above zero there after.

[NZ Thunderstorm Soc]

Frost this morning although cloud cover did move across around sunrise. Down to minus 1.3C again.

[NZ Thunderstorm Soc]

Another frost this morning, down to minus 1.1C. Nice day following

[tich]

Frost on the ground this morning in St Albans, but only a 2.5C air minimum across town at Hillmorton Station, which should mean a very slight ground frost at most.

[NZ Thunderstorm Soc]

Slight frosting this morning despite cloud blocking the view of the ecplise.
Bown to minus 1C.

[Richard]

You seem to get more frost where you are now John

[NZ Thunderstorm Soc]

Looks like it. Even around sun-up, the temperature this morning was minus 0.9C after a relatively mild night.

[Richard]

Slight frost this morning with it been on 0.4deg

[NZ Thunderstorm Soc]

Yet, another frost here this morning. Minus 1.5C.

[Old mate]

Cold here this morn -1.5. Had forgotten what it feels like.

[NZ Thunderstorm Soc]

Frosty overnight , well earlier, but that went off during the early morning. Minus 1C

[NZ Thunderstorm Soc]

Just going through my weather diary. I recorded 22 frosts here for July.
Minus 3.2C being the lowest (air) temperature on the morning of Wednesday the 4th.

[Richard]

Thirteen sub zero frosts for July here -4.2 the lowest.

[NZ Thunderstorm Soc]

Good frost here this morning. Down to minus 1.2C.

[Richard]

Thick fog here this morning so that kept it warmer

[NZ Thunderstorm Soc]

Fog overnight but that went off this morning, resulting in another frost. Down to minus 1.4C.
Seems to be a bit of a frost hollow down here.

[Simon Culling]

Just a general enquiry, but what would be the average number of air frosts per annum at representative sites in NZ. For example, here in the UK, Woburn, in the centre of England had an average of 53 for the reference period 1981-2000 and Bournemouth Hurn Airport on the south coast (but just inland + on sandy soil) had 61. A nearby coastal site in southern England, Swanage, had an average just 18 in the same period.

EDIT: I missed out the word 'frosts' in the first line which might have made my question rather difficult to fathom.

[Nev]

Just a general enquiry, but what would be the average number of air per annum at representative sites in NZ. For example, here in the UK, Woburn, in the centre of England had an average of 53 for the reference period 1981-2000 and Bournemouth Hurn Airport on the south coast (but just inland + on sandy soil) had 61. A nearby coastal site in southern England, Swanage, had an average just 18 in the same period.

Is this what you're after Simon?

NIWA - Mean number of days of ground frost.png

(Source)

[Simon Culling]

Hello Nev, thanks for the table of ground frost occurrence which is most informative. I was looking more for air frosts, i.e screen minimums of <0.0*C at specific sites.

With regard to ground frosts here in the UK, Bournemouth Hurn Airport averaged 106 ground frosts per annum in the 1981-2010 period and London Heathrow 83. The latter's average number of air frosts is 33 for this period.

Original question has been edited to include the word 'frost' in the first line which will make my question a little clearer. Sorry for the omission.

[NZ Thunderstorm Soc]

Slight frosting here this morning as cloud cleared away overnight. Down to minus 1.2C.

[cbm]

Shaping up to be a light year for frosts here, have only gone below -2C twice, min -2.3 June 30.
Looking at Ruakura data 1940-93, minimum for the year occured in August only 3 times, latest being August 16th. At this stage no high pressure predicted after the cold outbreak modelled for next weekend so it may not be a frost producer (if it occurs at all, still a fair way out)

[Orion]

+0.3°C at about 6am here this morning; lawn white by 8:00am.