Bhārata Strata · Maharashtra · Thane · rainfall trajectory
Rainfall & monsoon trend — cell 4970001630
How rainfall has changed over 125 years at this Thane locality cell — witnessed by IMD, every trend a Theil–Sen slope with its GUM standard error and a Mann–Kendall significance test. Missing is never zero.
Annual rainfall trend
-118 ± 20 mm/decade
highly significant · p = 1.9×10⁻⁷
Mann–Kendall τ
-0.32
monotonic trend strength · 125-year record
Annual mean
3,090 mm
interannual CV 29%
Recent 30y − first 30y
-867 mm
long-run shift in annual total
witness: tier_q_v1 — IMD gridded rainfall dynamics · 125 years · grid-assign 14.5 km · as of 2025-12-31 00:00 UTC
Seasonal decomposition
Monsoon (JJAS) trend
-113 ± 19 mm/dec
mean 2,940 mm · 95% of annual
Pre-monsoon trend
0 mm/dec
mean 23 mm
Post-monsoon trend
-0.6 ± 1.9 mm/dec
mean 124 mm
Winter trend
0 mm/dec
mean 2.3 mm
Extremes & distribution
Extreme 1-day rain trend
-1.9 ± 1.4 mm/dec
annual max 1-day mean 198 mm
Dry-day fraction trend
+0.004 /dec
mean 71% of days dry
Seasonality (PCI) trend
-0.17 /dec
Precipitation Concentration Index mean 29.3
Interannual variability
29%
coefficient of variation (year-to-year)
All trends are Theil–Sen slopes; ± is the 1σ GUM standard error; significance is Mann–Kendall (τ, p). Source: IMD, 125-year record, as of 2025-12-31 00:00 UTC.
Re-witness this trajectory
curl -s https://api.gridrock.ai/mcp -H 'Content-Type: application/json' \
-H 'Accept: application/json, text/event-stream' \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"read_witnesses",
"arguments":{"admin_code":497,"cluster_id":4970001630,"include_trajectory":true}}}'Scope: the live MH-36 cube. IMD rainfall dynamics are a pinned, sha-verified standalone witness; this page reads the live engine and never interpolates or back-casts.