Data from Changi Meteorological Station (S24) — operated by the Meteorological Service Singapore (MSS), located at Upper Changi Road North (lat 1.3678°N, lon 103.9826°E). Updates every minute via api.data.gov.sg · weather.gov.sg.
Note: This is not the WSSS (Singapore Changi Airport ASOS) sensor that Polymarket resolves against. S24 is an MSS surface station located approximately 1.3 km northwest of the WSSS aviation sensor. Both are on airport grounds and typically read within 0.5–1.0°C of each other, but the authoritative Polymarket source remains WSSS via NOAA METAR above.
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WSSS Daily Max · — · Last 10 Years
Source: Iowa State Mesonet · NOAA ASOS · Same sensor Polymarket resolves against
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10yr avg high
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daily max average
10yr peak
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all-time max
Days ≥ 34°C
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across all years
Days ≥ 35°C
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across all years
Average daily max by year
April at WSSS — Context & Probability Distribution
ENSO-adjusted base rates · last 3 / 5 / 10 years + 2026 running update
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Temp
Last 3 yrs 2023–25
Last 5 yrs 2021–25
10yr base rate 2016–25
Remaining days Apr remaining
* Remaining days = % of the remaining ${daysRemaining} April days expected at each temp, based on 10yr base rate minus days already observed. Updates daily as each new WSSS reading is confirmed.
NEA Forecast High vs WSSS Actual · Last 60 Days
NEA forecasted max · stored daily in your browser · WSSS actual from NOAA METAR
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—Avg error (MAE)
—Days NEA over
—Days NEA under
—Days exact
NEA forecasts island-wide, not WSSS. WSSS (coastal) tends to read lower. Snapshots stored locally from today.