Pollen Count in Trondheim
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Trondheim, Norway has cool, wet weather with temperatures rarely exceeding 20°C (68°F). Summers are short and winters can be long with snowfall.
Updated: 2/25/2026
The pollen season in Trondheim is generally mild due to the cool climate. Tree pollen, particularly birch, is highest in May. Grass pollen peaks in late June and early July.
The climate in Trondheim is oceanic, with the Gulf Stream keeping temperatures moderate. Rain is common year-round, which can help limit the spread of pollen, making the allergy season less severe than in drier climates.
Pollen Forecast Chart
Recommendations
When pollen concentrations reach a peak, we suggest these simple steps to help with hay fever. These tips are extra important on windy days when plants are in peak anthesis (the time when they release the most pollen).
- Wear masks if necessary
- Shower after going out
- Wear sunglasses if windy
- Close windows and doors
- Use an indoor air purifier
- Avoid wearing woolen clothes outside
- Limit outdoor activities
Annual Pollen Overview
Check out this month-by-month overview of the daily average pollen count in Trondheim 🌾. This data is based on previous years and serves as a guideline to help you understand when different pollen seasons typically occur in your city.
| Alder | Birch | Grass | Mugwort | Olive | Ragweed | |
|---|---|---|---|---|---|---|
| Jan | 0 | 0 | 0 | 0 | 0 | 0 |
| Feb | 0 | 0 | 0 | 0 | 0 | 0 |
| Mar | 3 | 0.1 | 0 | 0 | 0 | 0 |
| Apr | 10.5 | 279.1 | 0 | 0 | 0 | 0 |
| May | 0.3 | 455.9 | 0.6 | 0 | 0 | 0 |
| Jun | 0 | 353.5 | 39.7 | 0 | 0 | 0 |
| Jul | 0 | 12.9 | 133 | 12.8 | 0 | 0 |
| Aug | 0 | 0 | 5.9 | 6 | 0 | 0 |
| Sep | 0 | 0 | 0.3 | 0.1 | 0 | 0.6 |
| Oct | 0 | 0 | 0 | 0 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |