Bhutan has a diverse climate due to its varying topography and elevation. In general, the country experiences four distinct seasons: spring, summer, autumn, and winter. Here’s a brief overview of the weather you can expect during different months in Bhutan:

1. January: Winter season. Expect cold temperatures, especially in higher elevations, with occasional snowfall in the mountains.
2. February: Winter continues, with similar conditions to January. It can still be quite cold, especially in mountainous regions.
3. March: Transition to spring. Days become warmer, but evenings can still be chilly. It’s a good time to witness the blooming of rhododendrons and other flowers.
4. April: Spring season. Pleasant temperatures with occasional showers. The landscapes are vibrant with blossoms, making it a beautiful time to visit.
5. May: Spring continues, with warmer temperatures. It’s a great time for nature enthusiasts as the flora and fauna are at their best.
6. June: Summer season. The weather becomes warmer, with occasional rainfall. The higher altitude regions are more comfortable during this time.
7. July: Summer continues, with some areas experiencing monsoon rains. The weather can be unpredictable, with both sunny and rainy days.
8. August: Monsoon season. Expect frequent rainfall throughout the country, particularly in the southern and eastern regions. Trekking routes may be muddy and less accessible.
9. September: Monsoon begins to taper off, and the weather becomes more pleasant. It’s a transitional month between the monsoon and autumn season.
10. October: Autumn season. The weather is generally clear and mild, with pleasant temperatures during the day and cooler evenings. The landscapes are adorned with autumn foliage.
11. November: Autumn continues, with similar conditions to October. It’s an excellent time for trekking and outdoor activities.
12. December: Winter season. The temperatures drop, especially in higher elevations, and the possibility of snowfall increases. It can be cold, but the mountain vistas are often stunning.

It’s important to note that Bhutan’s weather can vary between regions and altitudes. Therefore, it’s advisable to check the specific weather forecast for the exact time and location you plan to visit before making any travel arrangements.