Forgot MWN too (but they aren't climate). They are 6 hourly, but a crapshoot with the wind.
We have a very old group of Coops up here, and they are pretty much uniformly walk out at 7 AM and measure snow. We know this because some bad mornings they say they don't have snow just yet because they haven't walked outside (too icy, windy, cold, etc). But it's also hard to convince someone to volunteer their time to meticulously measure how much snow falls. It's a commitment to be around all the time and have a back up for when you're on vacation.