Inaccurate overnightForecast condition code

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Created Apr ’23

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At the moment (8:30 PM), for a number of counties in my area, WeatherKit is indicating a conditionCode of WintryMix for overnightForecast. The low is above freezing, and according to the iPhone weather app there is zero percent chance of precipitation overnight. WeatherKit shows a 0.36 (36%) chance of precipitation but 0 precipitationAmount and 0 snowfallAmount.

No other weather data I can find indicates any precipitation overnight in this area. In fact it's supposed to be clear overnight. For now, as an immediate fix, I'm using the restOfDayForecast to get me to midnight, as it seems to be correct. However this is extremely concerning, and my users are very concerned (we're in a fairly southern area) because of this totally false WintryMix conditionCode. I'm really not sure what to do about this. Maybe ignore the condition code if it indicates precipitation but with a 0 precipitationAmount?

I'd also like to know why the iPhone weather widget is correct but this WeatherKit data is not. There are multiple counties in this area which are returning the WintryMix, so this is not some small geographic area doing this.

I'm including below the currentWeather and forecastDaily containing today's forecast.

Well, I tried to include it, but I get a "You have included content in your post that is not permitted." warning. Ridiculous.

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Answer 1

DanEast OP

Apr ’23

"daytimeForecast": {
	"forecastStart": "2023-04-03T11:00:00Z",
	"forecastEnd": "2023-04-03T23:00:00Z",
	"cloudCover": 0.9,
	"conditionCode": "Cloudy",
	"humidity": 0.55,
	"precipitationAmount": 0,
	"precipitationAmountByType": {},
	"precipitationChance": 0,
	"precipitationType": "clear",
	"snowfallAmount": 0,
	"windDirection": 172,
	"windSpeed": 8.91
},
"overnightForecast": {
	"forecastStart": "2023-04-03T23:00:00Z",
	"forecastEnd": "2023-04-04T11:00:00Z",
	"cloudCover": 0.49,
	"conditionCode": "WintryMix",
	"humidity": 0.8,
	"precipitationAmount": 0,
	"precipitationAmountByType": {},
	"precipitationChance": 0.36,
	"precipitationType": "mixed",
	"snowfallAmount": 0,
	"windDirection": 185,
	"windSpeed": 8.87
},
"restOfDayForecast": {
	"forecastStart": "2023-04-04T00:12:12Z",
	"forecastEnd": "2023-04-04T04:00:00Z",
	"cloudCover": 0.8,
	"conditionCode": "MostlyCloudy",
	"humidity": 0.73,
	"precipitationAmount": 0,
	"precipitationAmountByType": {},
	"precipitationChance": 0,
	"precipitationType": "clear",
	"snowfallAmount": 0,
	"windDirection": 178,
	"windSpeed": 10.86
}
}

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Answer 2

DanEast OP

Apr ’23

As you can see, there is zero precipitation in the exact same area overnight according to Apple's own weather app. The remaining 3 hours of today up until midnight are also 0 precipitation.

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