So, the next time you drizzle mustard oil into a pan or spread mustard on a sandwich, remember the cold winter nights that made those tiny seeds possible.
In very specific, cold mountainous regions (like parts of Kashmir, Himachal Pradesh, or the northern hills), the Rabi season is too cold for mustard. In these rare cases, farmers practice . This is sown in March/April and harvested in June/July.
Disclaimer: Agricultural practices vary by micro-climate. Always consult your local agricultural extension office for varietals suited to your specific region.