你知道一种方法来找到每天的雪水当量数据，只有雪和没有任何雨可能在同一天下?

背景故事:

嗨，我对这一切都很陌生。我在一个小城市工作，他们希望有更好的数据来分析我们过去的扫雪行动。为此，我们需要知道有多少雪。< / p >

We have had a million debates (familiar to you I'm sure) about all the different kinds of snow, and we've decided it's not fair to compare snow-inches - i.e. it will take longer to remove a few inches of wet heavy snow than many inches of light, dry snow.

Instead, we've decided to compare inches of equivalent water (what we call liquid equivalent inches but what I think is more properly called snow water equivalent). So my question is how to find this data.

I've found lots of data that shows both the snowfall inches and the precipitation. So, seems like you could just look for days when there is snowfall, and then take the precipitation. Here's a picture of NOAA data for an example. You'd say that on Dec. 14, there was no snow, and on Dec. 15, there was 1 inch of snow, which was formed by 1.14 inches of precipitation.

However! This data does not actually tell the whole story. Because on Dec. 15, first it rained a bunch, and then gradually that became snow. So the 1 inch of snow was formed by only some fraction of that 1.14 inches of precipitation. I'm only interested in the snow water equivalent of the snow itself.

So, what data can I used to get the snow water equivalent of just the snow?

My best thought has been to find data that gives snow, rain, and total precipitation inches in separate columns. Then I can find snow water equivalents by subtracting rain from total precip. Except, I can't find any such data - it all seems to be just snow, and total precip.

Do you know where I can find such data? Or do you have a different idea?