Winter season dating
Diamond dust, also known as ice needles or ice crystals, forms at temperatures approaching −40 °C (−40 °F) due to air with slightly higher moisture from above mixing with colder, surface-based air.According to the SMHI, winter in Scandinavia is more pronounced when Atlantic low-pressure systems take more southerly and northerly routes, leaving the path open for high-pressure systems to come in and cold temperatures to occur.These dates are somewhat later than those used to define the beginning and end of the meteorological winter – usually considered to span the entirety of December, January, and February in the Northern Hemisphere and June, July, and August in the Southern.– in the Northern Hemisphere, depending on the year, this corresponds to the period between 20, 21 or 22 December and 19, 20 or 21 March.
During winter in either hemisphere, the lower altitude of the Sun causes the sunlight to hit the Earth at an oblique angle.
In the UK, meteorologists consider winter to be the three coldest months of December, January and February.
New Zealand and South Africa, winter begins on 1 June and ends on 31 August.
As a result, the coldest January on record in Stockholm, in 1987, was also the sunniest.
Accumulations of snow and ice are commonly associated with winter in the Northern Hemisphere, due to the large land masses there.