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It’s still winter, but due to the mild weather the hay fever season has already started this year. The first alder and hazel trees are already in bloom, and since it is now sunny and dry, the first hay fever complaints can also arise.
“The hazel tree is flourishing all over the country,” says biologist Arnold van Vliet, who agrees that it is exceptionally early. Van Vliet also refers to a graph on Natuurkalender.nlwith the date of flowering of the hazel tree from the year 1868 to 2022.
“For a long time, that bloom date has averaged February 15, in recent years the peak has been around the end of the year and now it may be that the peak appears to be before the end of the year,” says Van Vliet . .
Rapidly rising temperature
Alder trees also bloom, which can lead to more complaints for people with hay fever. “Alders produce more pollen, which also causes more problems,” says the biologist. “Certainly when black alder starts flowering, complaints can escalate.”
The early flowering plants and trees are a result of the mild October and November weather. “Then it stopped for a while because of the short cold spell, but then the temperature went up again really fast.”
Hot because of the clouds
The moments of sunshine and clear spells disappear again, he reports Time square Today. Tonight the clouds will increase again from the southwest due to a new warm front moving towards the Netherlands. “As soon as the clouds also roll over these regions, the temperature rises to a level where it has been most often lately, i.e. around 10 degrees,” writes the weather site.
This weekend it will be between 10 and 12 degrees. May cool due to nocturnal clearance, but freezing point is not reached. Where it remains cloudy, the difference between the maximum and minimum temperatures is also minimal.
