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<blockquote data-quote="Lanefan" data-source="post: 8182918" data-attributes="member: 29398">To be pedantic, unless Corvallis is incredibly cloudy that 159 days of sun occurs across more than 159 days; it's not that each individual day is entirely sunny or entirely cloudy. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile&nbsp; &nbsp; :)"&nbsp; data-smilie="1"data-shortname=":)" />To expand a bit here: the climatological cutoff for &quot;desert&quot; is anything less than 10&quot; per year (might have been tweaked slightly for metric but close enough); and the range for &quot;semi-arid&quot; is between 10&quot; and 20&quot; per year.&nbsp; Most grassland is semi-arid.That said, some desert and-or semi-arid areas can get their entire annual rainfall in just one or two events.For world-building purposes, it's also worth noting there can be quite significant variants in annual precip even within just a few miles.&nbsp; For example in Victoria BC, where I live, there's a weather station downtown and another at the airport some 20 miles north; and the airport station gets about 1/3 more per year than downtown (used to be about 25&quot; vs about 34&quot; back when I paid attention) due to downtown being closer to the rain shadow generated by the Olympic mountains.&nbsp; There's a couple of places on the Washington side, about 20 miles south of downtown Vic. and deeper in that rain shadow, where the annual precip is well under 20&quot;.</blockquote>

[QUOTE="Lanefan, post: 8182918, member: 29398"] To be pedantic, unless Corvallis is incredibly cloudy that 159 days of sun occurs across more than 159 days; it's not that each individual day is entirely sunny or entirely cloudy. :) To expand a bit here: the climatological cutoff for "desert" is anything less than 10" per year (might have been tweaked slightly for metric but close enough); and the range for "semi-arid" is between 10" and 20" per year. Most grassland is semi-arid. That said, some desert and-or semi-arid areas can get their entire annual rainfall in just one or two events. For world-building purposes, it's also worth noting there can be quite significant variants in annual precip even within just a few miles. For example in Victoria BC, where I live, there's a weather station downtown and another at the airport some 20 miles north; and the airport station gets about 1/3 more per year than downtown (used to be about 25" vs about 34" back when I paid attention) due to downtown being closer to the rain shadow generated by the Olympic mountains. There's a couple of places on the Washington side, about 20 miles south of downtown Vic. and deeper in that rain shadow, where the annual precip is well under 20". [/QUOTE]

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