Bidhannagar has a **tropical wet-and-dry to humid subtropical monsoon climate**, commonly described under the Köppen system as **Aw**, with some sources classifying the wider Kolkata area close to **Cwa** characteristics because of its cooler winter and strong seasonality.
### Seasonal pattern - **Summer (March to June):** Hot and humid, with daytime temperatures often around **32–38°C**. Heat waves can push temperatures higher. - **Monsoon (June to September):** Heavy rainfall, high humidity, frequent thunderstorms, and waterlogging risk. - **Post-monsoon (October to November):** Warm, gradually drier, and often considered pleasant. - **Winter (December to February):** Mild and relatively dry, with typical temperatures around **12–26°C**.
### Typical climate characteristics | Climate factor | General pattern | |---|---| | Average summer highs | Often low-to-mid 30s °C | | Average winter lows | Often low-to-mid teens °C | | Annual rainfall | Roughly 1,500–1,700 mm in the Kolkata region | | Snowfall | None | | Humidity | High for much of the year, especially before and during monsoon |
### Best time to visit The most comfortable period is usually **November to February**, when temperatures are milder and humidity is lower than in summer and monsoon months.
### Weather risks - **Waterlogging and urban flooding** during intense monsoon rain - **Heat stress** in late spring and early summer - **Thunderstorms** including pre-monsoon nor'westers in the wider Bengal region - **Cyclonic impacts** from Bay of Bengal systems, usually more indirect than in coastal districts but still capable of causing heavy rain and disruption
Bidhannagar’s weather is very similar to Kolkata’s, though local built form, open spaces, and water bodies can slightly influence neighborhood-level conditions.