This white christmas calculator takes the figures you already have and applies the relationship behind white christmas calculations for you, giving snow depth change from probabilty of at least 1 inch of snow, snow depth previous and one way.
What Is the White Christmas Calculator?
The white christmas calculator turns probabilty of at least 1 inch of snow, snow depth previous and one way into snow depth change.
It is a quick way to get from the numbers you have to the number you need, without setting up a spreadsheet or reaching for a formula.
How the White Christmas Works
Each result follows from the ones before it, and the calculator shows every step, so a surprising answer can be traced back to the input that caused it.
Round your inputs to the precision you actually know, and keep more precision than that in the intermediate steps.
Getting a Result You Can Trust
Run the calculation twice with slightly different inputs. A sensible calculator moves its output in proportion; a wild change points to a unit or a decimal point problem in what you entered.
Write the inputs down next to the answer. It takes a moment and it is the difference between a number you can explain and one you cannot.
A Worked Example
Working through an example, with probabilty of at least 1 inch of snow set to 10, snow depth previous set to 5, one way set to 2, the calculator returns snow depth change of 5. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out snow depth change?
Enter probabilty of at least 1 inch of snow, snow depth previous and one way. The calculator then works through the relationship and reports snow depth change.
What does the white christmas actually calculate?
It takes probabilty of at least 1 inch of snow, snow depth previous and one way and converts them into snow depth change using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter probabilty of at least 1 inch of snow?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Can I use this for a quick estimate as well as a precise answer?
Yes. The calculator is built for quick checks, so round your inputs to a sensible number of significant figures and the result will be just as useful. If you need more precision, keep the same method and add digits to the inputs rather than adjusting the method itself.
Does anything you type get stored?
No. The whole calculation runs inside your browser, and nothing you enter is uploaded, logged or sent anywhere.