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For planning outdoor events, such as group camping trips, it would be useful to be able to look at a map showing average precipitation across history for a given time of year, week or day. For example, a map showing average rainfall for the second week of March. Does anyone know of such a thing? I'm looking for a generalized tool, but if it helps the specific regions I'm most likely to use this would be northern California.

  • You might accelerate getting a useful answer if you nailed it down to where. An answer for Alaska will be worthless in Siberia. – Gayot Fow May 23 '16 at 18:41
  • @GayotFow Well I was looking for a genralized tool, but I added a region. – Ross Patterson May 23 '16 at 18:44
  • It looks a lot better now. Soon you will have some really great answers. – Gayot Fow May 23 '16 at 19:42
  • You can find average rainfalls for areas, on various climate websites. But most of this data comes from a few collection points like airports, tv stations, etc. The accurately map it by area on a regional map would require a lot more data collection points. – user13044 May 24 '16 at 2:49
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    This tag combo has lots of ideas, including Is there a website with historical temperatures? which looks dupey... – AakashM May 24 '16 at 8:35
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Climate.org should have what you are looking for. Their website gives downloadable maps for different times of year, and testing lots of different conditions such as rainfall.

Here's an example for the average rainfall in March 2016 in the US : enter image description here

For example, we can see from this that the rainfall in March 2016 in Florida was about 1 inch. We can compare this to New York, which had about 3 inches. We can then compare this with other months using the tools on the website.

There are many more options available on the website such as Average Temperatures, Outlooks, Drought Monitors etc

For a more general view, check out these sites;

  • Really close, I did find those in my searching before asking here. But I can't find a way to show average precipitation for a given month/week accross all years, not specific to 1 year. – Ross Patterson Jun 9 '16 at 21:35
  • You could get that in a table, but is it a must for it to be on a map? @RossPatterson Are you wanting a map showing average temperature for everywhere since records began? – Nathan Shoesmith Jun 10 '16 at 14:32
  • Per the question: yes on map, no temperature (the question says precipitation). As for across history, since records began is not necessary, in fact "last decade" would probably be best, but I really don't care how long the history is. – Ross Patterson Jun 10 '16 at 20:06
  • I mean, this shows yearly better climate-charts.com/World-Climate-Maps.html - I'll have another look to see if I can find anything for monthly. @RossPatterson – Nathan Shoesmith Jun 10 '16 at 20:29
  • Would an answer with this in help? ncdc.noaa.gov/temp-and-precip/global-maps @RossPatterson – Nathan Shoesmith Jun 10 '16 at 21:06
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I have used http://www.weatherbase.com/ in the past Put in a city and get monthly averages highs and lows, rain and snow stats etc. You can also drill down to a particular day but I don’t think it will do it by week.

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    Does the website have a map facility as the question asks, or just data in tables @Dax ? – Nathan Shoesmith Jun 9 '16 at 19:15

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