Forecast

Hazel and alder catkins are still closed!

The weather conditions of the past week have not allowed any pollen to fly. This trend will continue in the coming days, although it will be somewhat warmer in Vorarlberg than in eastern Austria, at least in the valleys. Therefore, localised pollution is only to be expected at locations with very favourable thermal conditions.

In these locations, the purple alder can cause pollution. However, even this plant, which is actually known for starting to flower around Christmas, will only be able to release a small amount of pollen due to the expected conditions, although a number of catkins still have flowering potential.

In the alder species that are more widespread in Austria(black alder and grey alder), the catkins are still firmly closed and therefore cannot yet release any pollen. This also applies to the tree and shrub hazels.

The current temperatures also have an impact on the flowering readiness model. From a current perspective, the data tends to indicate that flowering readiness will be reached at the beginning of February.

Forecast date: 2026-01-19

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.