In short: Tonganagaon Tea Estate is a black tea producer in Assam, India, operated by Chamong Tee Exports Pvt Ltd at an elevation of 126 metres.
Tonganagaon Tea Estate is a black tea producer located in Assam, India, at an elevation of 126 metres above sea level. The estate is operated by Chamong Tee Exports Pvt Ltd, a company better known for its holdings in Darjeeling and Sikkim. Tonganagaon's position in the Upper Assam plains, at latitude 27.5° North, places it in one of the world's most prolific black tea growing regions.
Terroir & Climate
At 126 metres elevation, Tonganagaon sits in the low-lying alluvial plains characteristic of Assam's tea belt. Estates at this altitude typically experience a warm, humid subtropical climate with heavy monsoon rainfall and minimal diurnal temperature variation. These conditions generally favour rapid, vigorous growth and the production of bold, malty leaf styles associated with orthodox and CTC black teas from the region.
The latitude and low elevation tend to result in an extended growing season, with multiple flushes possible from March through November. The combination of heat, moisture, and rich alluvial soils typically promotes high yields and the development of the robust, full-bodied character for which Assam teas are known in the global blending trade.
Tea Produced
Tonganagaon produces black tea. Estates in Assam at comparable elevations typically yield teas with a strong, brisk cup, marked by malty sweetness and a full body. The low-altitude growing environment often encourages the development of bold, copper-coloured infusions well suited to breakfast blends and chai preparations. The specific character of Tonganagaon's production—whether orthodox or CTC, and the seasonal variation between first and second flush—remains unrecorded in available supply-chain data.
Operator
Tonganagaon is operated by Chamong Tee Exports Pvt Ltd, a Kolkata-based tea company with a portfolio concentrated in high-elevation estates in Darjeeling and Sikkim. Chamong's involvement in Assam represents a geographic departure from its better-known orthodox tea holdings in the Eastern Himalayas. The company is a significant exporter to European and North American markets, though no other estates operated by Chamong are currently recorded in this directory.
Location & Neighbouring Estates
Tonganagaon Tea Estate lies at 27.4978, 95.3639 in Assam, India. Its 126 m elevation is the joint 13th highest of 66 estates we map in Assam. The nearest estates in the TeaTrade directory, measured point-to-point from these coordinates, are:
- Sewpur — under 1 km away
- TALUP — 1.3 km away
- Rungagora J — 2.4 km away
- Itakhooli Tea Estate — 4.4 km away
- Keyhung Tea Estate — 7.9 km away
Estates at a Similar Altitude to Tonganagaon Tea Estate
Elevation shapes how slowly leaf matures, so we match Tonganagaon Tea Estate (126 m) with estates within 150 m of its height that are not its neighbours. Each is shown with its own 2025 climate. Tonganagaon Tea Estate recorded 3,184 mm in 2025, 23% more than the 2,590 mm average across these estates: at the same height, local weather and exposure matter as much as elevation.
| Estate | Where | Elevation | Rain 2025 | Mean high |
|---|---|---|---|---|
| KDU, Galpaditenne | Sabaragamuwa Province, Sri Lanka | 126 m | 3,902 mm | 29.5 °C |
| Amgoorie | India, India | 125 m | 3,227 mm | 28.5 °C |
| Spring View | Sabaragamuwa Province, Sri Lanka | 125 m | 3,902 mm | 29.5 °C |
| Zhejiang Wuyi Tea Base | P.R, China | 128 m | 1,604 mm | 24.6 °C |
| I \u0026 M Smith | Western Cape, South Africa | 124 m | 313 mm | 27.4 °C |
Tonganagaon Tea Estate Compared with Assam
In Assam, Tonganagaon Tea Estate is wetter than 68% of the others by 2025 rainfall; higher than 78% of the others by elevation; cooler than 88% of the others by daytime temperature. The table sets Tonganagaon Tea Estate against the 65 other estates we map in Assam, so you can see whether it is typical for its region or an outlier.
| Measure | Tonganagaon Tea Estate | Region median | Region range |
|---|---|---|---|
| Elevation | 126 m | 109 m | 26 to 266 m |
| Annual rainfall (2025) | 3,184 mm | 2,919 mm | 1,742 to 4,142 mm |
| Mean daily high | 28.3 °C | 28.7 °C | 27.9 to 30.0 °C |
| Mean overnight low | 19.2 °C | 19.6 °C | 18.8 to 21.1 °C |
Observed Climate at Tonganagaon Tea Estate (2025)
ERA5 reanalysis data modelled for Tonganagaon Tea Estate’s coordinates recorded 3,184 mm of precipitation across calendar year 2025. The wettest month was August (560 mm) and the driest was December (9 mm). Daytime highs averaged 28.3 °C and overnight lows 19.2 °C over the year; July was the warmest month and January the coolest.
| Metric | 2025 value |
|---|---|
| Annual precipitation | 3,184 mm |
| Wettest month | August (560 mm) |
| Driest month | December (9 mm) |
| Mean daily high | 28.3 °C |
| Mean overnight low | 19.2 °C |
Frequently Asked Questions
Where is Tonganagaon Tea Estate located?
Tonganagaon Tea Estate is in Assam, India, at coordinates 27.4978, 95.3639, at an elevation of about 126 metres.
Who operates Tonganagaon Tea Estate?
Tonganagaon Tea Estate is operated by Chamong Tee Exports Pvt Ltd, according to public supply-chain records.
What type of tea does Tonganagaon Tea Estate produce?
Tonganagaon Tea Estate is recorded as producing black tea.
How much rain does Tonganagaon Tea Estate receive?
ERA5 reanalysis data for the estate's coordinates recorded 3,184 mm of precipitation in 2025, peaking in August (560 mm).
How does Tonganagaon Tea Estate compare with estates at a similar elevation?
Tonganagaon Tea Estate recorded 3,184 mm in 2025, 23% more rain than the 2,590 mm average of estates at a similar elevation.
Data sources: public supply-chain disclosures (Ethical Tea Partnership member lists, Rainforest Alliance certificate holders and retailer supplier disclosures); climate figures are ERA5 reanalysis modelled for the estate’s coordinates via Open-Meteo (calendar year 2025); coordinates and elevations from geocoded records. Spotted an error? Email [email protected].
