"What the weather is" is far too general. To what radius? To what granularity? What questions do we care about? Temperature? Humidity? Wind speed? Wind directio

"What the weather is" is far too general. To what radius? To what granularity? What questions do we care about? Temperature? Humidity? Wind speed? Wind direction? Cloud cover? Air quality? Pressure? Is it raining, snowing, sleeting, hailing? What are the features of the precipitation, if it exists? How long has it been raining? Are the rivers in danger of overflowing their banks? Is it flooding? If it is snowing, is the snow sticking? Are the conditions right for black ice? This is why, when I want to know what the weather is, I use the vast array of sensors that the US government has paid for, and the expertise of meteorologists. Just google it.