From photos of it, it looks surprisingly productive for a wild tree. Any clue how old / big they are when they start fruiting? How would you compare the fruit to a jackfruit? I assume both male and female flowers on the same tree, not a strong smell from them or the plant, just the fruit?
You're in Kerala, so I assume it's likes not just a hot climate, but in particular a hot humid one? Do you think it requires a dry season? Given that it's fruiting now, I presume that it flowers during the wet periods and the fruit matures during the dry season? Is it humid in the dry season as well, or just the wet season? I see that rainfall in Kochi bottoms out at 23mm (0,917") in January and peaks at 705mm (27,79") in June. There's four months (Dec-Mar) less than or equal to below 42mm (1,7") but five months (May-Oct) greater than or equal to 282mm (11,1"). So a pretty pronounced monsoon. I imagine the tree has a deep taproot.
Looks like the record low in Kochi is 16,3°C (61,3°F), so yeah, I seriously doubt this plant can take cold
But your record high is only 36,4°C (97,5°F), so it clearly doesn't need excessive heat either. Looks like year-round your lows average 22-26°C (72-79°F) and your highs average 29-33°C (84-92°F). A very, very maritime climate.
Hmm, these numbers are from Kochi, but I see there's mountains in Kerala. Is it toward the coast or up in the mountains? By contrast, the stats for Munnar (1450-2,695m):
Record low: -4°C (25°F), Sevenmallay region (Wow, really? I can just imagine the ads: "Ski Kerala!"
)
Average yearly low: 5°C (41°F)
Average daily low: 12,9-17,3°C (55-63°F)
Average daily high: 22,4-25,6°C (72-78°F)
Driest month average rainfall: Jan, 18mm (0,71")
Wettest month average rainfall: Jul, 583mm (22,95")
So, significantly cooler than the coast, and drier. I guess it matters a lot where they're growing! Let's see what Useful Tropical Plants has to say:
"A plant of the tropics, where it is found at elevations up to 1,300 metres. It grows best in areas where annual daytime temperatures are within the range 22 - 32°c, but can tolerate 16 - 38°c. It prefers a mean annual rainfall in the range 2,500 - 3,500mm, but tolerates 1,700 - 4,500mm. Older plants succeed in full sun or moderate shade, but younger trees require reasonable levels of shade. Succeeds in most soils, preferably well-drained. Prefers a pH in the range 5 - 6.5, tolerating 4.5 - 7.5. A fast growing tree. Trees do not coppice well, but produce abundant root suckers. The tree has a deep taproot"
Up to 50m tall, with a bole up to 1,5m diameter. Quite an impressive tree! Given that it can grow at altitudes up to 1300m, I'd expect it could take lower than 16°C without damage. The estimate of 10°C sounds spot on given the climate.