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Precipitation/weather code not accurate (Gimpo, Korea)  #851

@Leftium

Description

@Leftium

The past couple days I noticed Open Meteo said the sky was clear, but it was clearly overcast IRL (no patches of blue sky were visible).

I just noticed it's been raining for the past few hours, but Open Meteo did not/does not forecast rain in the near future (next hour), and decided to document it:

It was clearly raining pretty heavily within the past hour, and the sky is currently quite cloudy but Open Meteo API says "Mostly Clear":

  • Also, the green area on the map is current precipitation from the RainViewer API.

image

The OpenWeather forecast for the same location is much more accurate:

image

Here is a photo of the current conditions at this location:

  • The sky is fairly cloudy.
  • The streets are still wet from rain.

image

Data from Open Meteo (not the exact call from the screen capture, but taken shortly after):
{
    "latitude": 37.65,
    "longitude": 126.6875,
    "generationtime_ms": 0.1729726791381836,
    "utc_offset_seconds": 32400,
    "timezone": "Asia/Seoul",
    "timezone_abbreviation": "KST",
    "elevation": 9,
    "current_units": {
        "time": "unixtime",
        "interval": "seconds",
        "temperature_2m": "°F",
        "relative_humidity_2m": "%",
        "is_day": "",
        "precipitation": "mm",
        "rain": "mm",
        "showers": "mm",
        "snowfall": "cm",
        "weather_code": "wmo code"
    },
    "current": {
        "time": 1718400600,
        "interval": 900,
        "temperature_2m": 67.3,
        "relative_humidity_2m": 97,
        "is_day": 1,
        "precipitation": 0,
        "rain": 0,
        "showers": 0,
        "snowfall": 0,
        "weather_code": 2
    },
    "hourly_units": {
        "time": "unixtime",
        "temperature_2m": "°F",
        "relative_humidity_2m": "%",
        "precipitation_probability": "%",
        "precipitation": "mm",
        "weather_code": "wmo code"
    },
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            3,
            3,
            3,
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            3,
            3,
            3,
            3,
            3,
            3,
            3,
            3,
            3,
            3
        ]
    },
    "daily_units": {
        "time": "unixtime",
        "weather_code": "wmo code",
        "temperature_2m_max": "°F",
        "temperature_2m_min": "°F",
        "sunrise": "unixtime",
        "sunset": "unixtime",
        "precipitation_sum": "mm",
        "rain_sum": "mm",
        "showers_sum": "mm",
        "snowfall_sum": "cm",
        "precipitation_hours": "h",
        "precipitation_probability_max": "%"
    },
    "daily": {
        "time": [
            1718204400,
            1718290800,
            1718377200,
            1718463600,
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        ],
        "temperature_2m_max": [
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            75.8,
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            92.4,
            91.9,
            85.1,
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        ],
        "temperature_2m_min": [
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            66.6,
            65.1,
            61.9,
            64.7,
            69.5,
            70,
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        ],
        "sunrise": [
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            1718309473,
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        ],
        "sunset": [
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            1718362561,
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            1718535407,
            1718621827,
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        ],
        "precipitation_sum": [
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        "rain_sum": [
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        "snowfall_sum": [
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        "precipitation_hours": [
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        ],
        "precipitation_probability_max": [
            0,
            21,
            77,
            29,
            0,
            0,
            0,
            10,
            13
        ]
    }
}

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