Pollen Count in Calais
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Calais has two main pollen seasons. Tree pollen is in the air from March to May. Trees like oak, birch, and beech produce a lot of pollen.
Updated: 5/23/2026
Grass pollen is in the air from May to July. Grass grows everywhere in Calais, and it produces a lot of pollen during this time.
Weed pollen is in the air from August to October. Weeds like ragweed and nettle produce pollen that can cause problems.
The amount of pollen in the air changes daily. Sunny and windy days usually have more pollen. Rainy days usually have less pollen in the air.
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 Calais 🌾. 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 | 4.6 | 0 | 0 | 0 | 0 | 0 |
| Mar | 292.4 | 18.7 | 0 | 0 | 0 | 0 |
| Apr | 3 | 789.7 | 13.4 | 0 | 0 | 0 |
| May | 0.6 | 112.5 | 59.5 | 0 | 0.7 | 0 |
| Jun | 0 | 0 | 421.7 | 12.8 | 0.2 | 0 |
| Jul | 0 | 0.1 | 178.8 | 81.6 | 0 | 0 |
| Aug | 0 | 0 | 45 | 26 | 0 | 0.3 |
| Sep | 0 | 0 | 4.7 | 1.4 | 0 | 0.9 |
| Oct | 0 | 0 | 0.3 | 0.2 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
(30 km)
(50 km)