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– Changing only every 30 years, it’s not really adapted to the fact that temperature and climate change faster than you thought then, 80-90 years ago when it started, says Sverker Hellström, a climatologist at SMHI.
In order to compare climate data, the values must be applied to the same time period. When SMHI assesses what normal weather is, the comparisons are made over a 30-year period, called the normal period. Now normal periods need to be updated more frequently.
The actual The 30-year period 1991-2020 soon ends. The next normal period starting in 2021 will be updated in 2030, so it won’t be until 2050 as it would with the system until now:
– The difference is that so far we have changed every 30 years. But from now on, yes 2030, we will update again for what will be every ten years from now.
This is an international decision of the World Meteorological Organization. The current normal period, which ends like this at the end of the year, is expected to show that many months in the last ten years have been warmer than the previous normal period, the years 1961-1990.
In practice, the new layout will be marked by some statistical jumps, which you need to know, says Sverker Hellström:
– The most obvious is that there will be fewer months warmer than normal and some months colder than normal. At least to start after we change the normal period. There will be a bit of hope that way.
But it is not just the normal period used to study the weather. But you can see the average temperature of each month and each year. In fact, it is independent of the normal period you use.
