Forecast

The first hazels have started to flower!

In thermally favoured locations, some hazels have already started to produce dust. They can cause the first symptoms in sensitised people. In the valleys of Styria, the number of hazels ready to flower will increase in the coming days. The weather forecast promises changeable weather for this weekend. Allergy sufferers can expect some relief where it rains. In addition, temperatures are expected to fall below 5 °C again at the beginning of next week, which will inhibit the release of pollen.

In large parts of Styria, the catkins of the grey and black alders still need a few warm days to be ready for flowering. However, in climatically favourable locations, for example in residential areas or in sunny locations on south-facing slopes, individual alders may already be ready to flower and cause local nuisance in their vicinity.

In urban and suburban areas, the purple alder has already used up most of its flowering potential. As it is not a native tree, it only occurs in Styria as a planted park, avenue or street tree in residential areas. Our reference plants in Graz have already reached the peak of their flowering period, but can continue to release pollen in dry weather and cause localised pollution.

From a current perspective, the data from our model indicates that flowering readiness will be reached between the middle and end of February.

Forecast date: 2026-02-13

Note: The data shown here are model data for the expected start of flowering. For more detailed information on the expected pollen count, please refer to the text forecasts.