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Summer Mid June to mid September.
Autumn Mid September to the first snow which could be November 1st but rarely is any more.
Winter November-March. Although I still had green weeds all winter long.
Spring April-June but we are stuck in March weather still.
Our season's are confused except for summer and our unusual heat waves as of late.
Heat waves are not unprecedented in our climate. That's the nature of an extreme continental climate like ours. Heat waves also happen all the time, they are not new, thus not unprecedented
Summer - December to end of March, as measured by the swimming season.
Autumn - April to early June. This is the most variable one, as consistent winter condition can sometimes start in mid May, or sometimes in late June.
Winter - Early June to mid/late August
If you are considering temperatures only, and split the entire range of daily temperature means for a given location - top 25% of the range = summer, bottom 25% = winter, results can be interesting -an idea I first saw in the USA Today weather almanac. I did the calculations for a number of NZ locations, using unedited but reasonable data over fairly long time periods. With a slight amount of smoothing this gives average durations and dates.
For Nelson (60+ years of data) this gave:
Spring = 86 days (6 Sep-30 Nov), Summer = 116 days (1 Dec-26 Mar), Autumn = 59 days (27 Mar-24 May), Winter = 104 days (25 May-5 Sep).
A simpler approach is to simply rank the averages of all the days and use the top and bottom 25% of the days rather than the temperature range, but that ignores the variable rate of change over the seasons.
If you are considering temperatures only, and split the entire range of daily temperature means for a given location - top 25% of the range = summer, bottom 25% = winter, results can be interesting -an idea I first saw in the USA Today weather almanac. I did the calculations for a number of NZ locations, using unedited but reasonable data over fairly long time periods. With a slight amount of smoothing this gives average durations and dates.
For Nelson (60+ years of data) this gave:
Spring = 86 days (6 Sep-30 Nov), Summer = 116 days (1 Dec-26 Mar), Autumn = 59 days (27 Mar-24 May), Winter = 104 days (25 May-5 Sep).
A simpler approach is to simply rank the averages of all the days and use the top and bottom 25% of the days rather than the temperature range, but that ignores the variable rate of change over the seasons.
Interesting. Summer and Autumn are fairly similar to my rating. Late Winter/early Spring has the most difference. I see late August /early September as Spring, as while the temps are still a bit cool and frost likely, the growing strength of the sun means the feel of seasonal change is very evident.
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