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"built_at": "2026-03-21T19:42:53.519462",
"location": "Chennai, India (13.08N, 80.27E)",
"data_sources": [
"Open-Meteo Archive",
"USGS Earthquake API",
"Open-Meteo AQI"
],
"weather": {
"period": "2021-03-15 to 2026-03-14",
"total_days": 1826,
"avg_temp_max_c": 31.9,
"max_temp_ever_c": 41.0,
"min_temp_ever_c": 24.0,
"avg_daily_precip_mm": 4.44,
"max_single_day_rain": 255.8,
"avg_wind_kmh": 18.1,
"max_wind_kmh": 53.1,
"monthly_total_precip_mm": {
"1": 230.4,
"2": 19.2,
"3": 71.4,
"4": 73.8,
"5": 520.2,
"6": 343.6,
"7": 620.1,
"8": 866.0,
"9": 745.7,
"10": 1257.4,
"11": 2133.6,
"12": 1231.7
},
"yearly_summary": {
"2021": {
"avg_temp_max": 32.0,
"total_precip_mm": 1626.3
},
"2022": {
"avg_temp_max": 31.3,
"total_precip_mm": 1441.4
},
"2023": {
"avg_temp_max": 32.0,
"total_precip_mm": 1625.2
},
"2024": {
"avg_temp_max": 32.2,
"total_precip_mm": 1610.5
},
"2025": {
"avg_temp_max": 32.4,
"total_precip_mm": 1699.8
},
"2026": {
"avg_temp_max": 29.2,
"total_precip_mm": 109.9
}
},
"peak_monsoon_months": "June-November (Northeast monsoon dominant Oct-Dec)",
"heatwave_season": "March-June (temps frequently exceed 38C)",
"cyclone_peak_season": "October-December (Bay of Bengal cyclogenesis)"
},
"earthquakes": {
"total_events_5yr": 23,
"avg_magnitude": 4.58,
"max_magnitude": 5.1,
"region": "Bay of Bengal / South India (~1000km radius from Chennai)",
"risk_note": "Chennai on stable Deccan shield. Major risk from Bay of Bengal subduction zone."
},
"aqi": {
"total_days": 366,
"avg_aqi": 49.2,
"max_aqi": 96.6,
"context": "Typically moderate (50-100). Winter spikes (Nov-Jan) from crop burning and low wind."
},
"notable_events": [
{
"event": "Cyclone Michaung",
"date": "December 2023",
"impact": "Category 1 landfall, severe Chennai flooding, 2500mm rain in 48hr"
},
{
"event": "2015 Chennai Floods",
"date": "November-December 2015",
"impact": "Worst flooding in 100 years, 500+ deaths, $3B damage"
},
{
"event": "2004 Indian Ocean Tsunami",
"date": "December 26 2004",
"impact": "Mag 9.1 Sumatra earthquake, Chennai coastline devastated"
},
{
"event": "Cyclone Vardah",
"date": "December 2016",
"impact": "Direct hit Chennai, 100+ km/h winds, widespread damage"
},
{
"event": "Cyclone Nivar",
"date": "November 2020",
"impact": "Very severe cyclone, landfall near Puducherry, heavy Chennai rain"
}
],
"climate_patterns": {
"type": "Tropical wet and dry (Koppen Aw)",
"annual_rainfall_mm": "~1400mm avg, 60% from Northeast monsoon Oct-Dec",
"sea_surface_temp": "Bay of Bengal 28-30C peak Jun-Oct (cyclone fuel)",
"urban_heat_island": "UHI adds +1.5 to 2.5C vs rural",
"warming_trend": "Max temps rising ~0.3C per decade since 1980",
"flood_risk_zones": "Adyar, Cooum, Buckingham Canal flood plains highest risk"
}
} |