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I have made a utility that generates 15 days of random weather for you based on the rules in Ultimate Wilderness. In addition to the UW rules, it will also give you reasonable times for sunrise/sunset based on your given location and time of year (or a randomly generated location if you don't plug one in).
It runs in the browser and should be compatible with all modern browsers (Chrome, Firefox, Edge, Safari, etc.). The application can be used offline provided you load it in your browser before disconnecting from the internet.
You can view it HERE.
Please let me know what you think and if you have any questions/comments/feedback :)
Thanks for doing this! Haven't checked it out yet, but will soon.
Tried a few forecasts using my own location and date and it seems weirdly hot. And then I tried for a date 6 months from now, in the middle of (southern hemisphere) winter, which came out with nights colder than it has ever got here since records began. Probably something to do with UW assuming that adventures happen on an analog to North America?
That's funny. I have heard stories that living in Seattle tends to skew Paizo's expectations of weather :)
Tried a few forecasts using my own location and date and it seems weirdly hot. And then I tried for a date 6 months from now, in the middle of (southern hemisphere) winter, which came out with nights colder than it has ever got here since records began. Probably something to do with UW assuming that adventures happen on an analog to North America?
The UW system has a sidebar for desert climates (hence why I added those two options in the biome section), but no sidebars for other biomes. That could throw off what temperatures are like in UW vs what you experience in real life. The other issue could be some places where the app UI is rather nonintuitive (see below).
The very bottom part (latitude/longitude/month/day/elevation in ft) is currently only used to derive sunrise/sunset times, and the temperature stuff is pulled from the selections in the very top. It's on my todo list to make the numbers sync back up, so changing the bottom numbers will change the selections in the top as well. Sunrise/sunset isn't specified in UW, but since UW did say that there's a fixed day temp and a cooler fixed night temp, I felt it would be useful to tell GMs when a reasonable sunrise/sunset time would be so they can figure out when those temps switch over. Actual determination of sunrise/sunset is based on the same equations used to determine them for Earth (with a few simplifications to make it easier to code, but nothing simple enough to print as RPG rules).
EDIT: I've updated the app so that changing the toggles in the top clears the numbers on the bottom, and that changing the numbers on the bottom updates the toggles in the top to match. This should make it easier to get sane results (instead of accidentally having a mismatch).
dotting for interest! (Ultimate Wilderness Weather Program)
That's pretty cool! Thanks for working on it.
The base temperature in the UW system is based entirely on latitude and elevation. The "desert" selection changes the precipitation base, but doesn't impact temperature at all. As a result, you'll be seeing results that are colder than you expect for a desert in a temperate region.
For a temperate region, baseline temperature during the summer is 80. If you are at sea level, you add 10 to that for a baseline of 90. Then a d% roll is made whose results can vary that baseline by up to 3d10 degrees in either direction. This can result in summer temperature of 60-120, with the average being equal to the baseline (90). The system assumes that the daily temperature stays relatively static during the day and then the night is 2d6+3 degrees colder (so yes, the difference between high and low can be at most 15 degrees according to the system, and on average 10 degrees).
If the results are nonsensical for a particular climate, the GM can certainly adjust them. I wanted the tool to implement RAW without editorial input as to whether or not the RAW makes sense for real-world climates.
For somewhere that is meant to be hot and dry like a desert, I would recommend picking the "tropical" region and then checking the desert thing to bring precipitation back down to almost nothing. That will give you a baseline of 115 degrees at sea level, with a total range of 95-135 (tropical varies by up to 2d10 in each direction instead of 3d10 for temperate).
Good to have some free peepins at that PF weather-generator stuff out there. ;)