Wikitravel:Climate Expedition page is for bringing together our efforts to present concise traveler oriented climate and weather info.
Rationale. Travelers want to know basic climate info about the places they are going. It helps them travel light by bringing only the things they need, and travel comfortably by bringing the right things. Wikitravel lacks clear guidelines about how to write this info well. This expedition is designed to develop those guidelines.
Be traveler focused—provide only information travelers need. Traveler focused climate and weather info need not take up much space. Just the concise relevant facts, read at a glance, are all travelers need. Further details belong on climate and weather sites.
Bring together our efforts to write traveler focused climate info.
Learn what the legal limits are so we don't overstep them. Facts are not subject to copyright. So we have some legal footing for using some data (facts) from copyrighted sources.
Write Wikitravel's guidelines on writing climate info, once we figure enough of this out.
Ko Chang(permanent link because I'm going to change it to use the template now) and Antalya(also permalink) show simple table wiki markup used instead of a template. Nice, too. Are templates better? I think templates are better because they put computers to work updating every instance of themselves as we improve the layout and this helps keeps Wikitravel's look and feel consistent. But simple is tables work, too. --Rogerhc 02:51, 3 June 2007 (EDT)
Template:Climate - can use Imperial or Metric units of measure depending what you set its 'units' parameter to. It also has a text box at the bottom for descriptive text about climate and or links to forecast sites (such as via a nested Template:ForecastNOAA). This is a refactored and modified version of Template:ClimateCelsius. Please comment on the talk page which also shows what it looks like. Thanks! :-)
Template:ClimateCelsius - Excellently scripted to display only the data you give it! Only to be used for locales where the temperatures are measured in Celsius.
Template:ClimateFahrenheit - Fahrenheit version of above, excellent! Only to be used for locales where temperatures are measured in Fahrenheit.
Template:Forecast - Only to be used for U.S. destinations. The template links to a National Weather Service forecast for the destination in questions. The template's successful use is dependent on three values: the name of the place; the latitude (in decimal) form; and the longitude (in decimal form). Because linking to a NWS site on a printed version of Wikitravel is pretty fruitless, when someone clicks on the "Printable version" link (in the "toolbox" section) the template will not be displayed.
Template:ForecastNOAA - Only for US locations. Provides an in-line text link to NOAA 7 day forecast. Similar to, and inspired by Sapphire's work in, Template:Forecast. An example of this template nested within the 'description' parameter of Template:Climate is in Palo Alto page.
Parser functions are used on this expedition; help understanding them is at mediawiki.org and meta
Tables in wiki markup and how to add styling is explained at mediawiki.org
Template:ClimateDev1 - status: it WORKS. "units" parameter set to either "Metric" or "Imperial" and optional "description" parameter set to some text to describe the location's climate in prose that can also include a link to local 7 day forecast via a nested Template:ForecastNOAA or plain URL link. This is a development version for experimentation of Template:Climate.
National Park Service — The National Park Service (NPS) provides detailed descriptions of the climates for many U.S. National Parks and Monuments. Simply click on the national park in question, then click on the "Plan your visit" page. Typically, there will be a "Things To Know Before You Come" link, click on it. Now, on the Things To Know Before You Come page click on the "Weather" link, if there is one. Not all parks/monuments provide this information, but a lot do. See the weather page for Glacier National Park. Typically descriptions can be copied verbatim, however, some copyediting may be required.
National Oceanic and Atmospheric Administration — NOAA collects all kinds of useful data, but NOAA's scope is essentially limited to U.S. locales, however, you can find information for non-US places that have a strategic partnership with NOAA. NOAA has amazingly useful data tables  to which will allow you to search for averages for particular cities throughout the U.S.