FAQ - History

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You can find historical weather data for most locations using our History and Almanac feature. Open the city weather page for your location, scroll down the page and look for a section called "History & Almanac" in the "Nearby" section. Adjust the date and click "View" to open the history page. You can also use the "Local Weather" drop down feature and then select the "History Data" link.

Personal Weather Station history is also available by either clicking on the station name in the current conditions box or by clicking on the specific station using the "Weather Stations" list at the bottom of the local forecast page.


The history page displays daily record, high, low and average summary information in addition to all of the observations for a particular date range. Use the toolbar links at the top of the page to browse for data by date, airport code and range (e.g., month). Scroll down the page to view specific observation data or the weather summary by day. Download the data using the "comma delimited" file link below the table of observations.


The default view for the History page is daily - however, you can also view our historical data by week, month, and custom time spans. For example, if you click "Custom", you can choose two dates from the drop-down boxes that appear on the Custom page, and view data for the desired length of time.

The History page gives a summary as well as graphs, but if you scroll down the page you will find a more detailed chart of weather data. Viewing by day gives the most specific information, by hour. Viewing by week, month, or a custom time span will show the data by day.


About our Weather History

Our history data is only archived back to 1994, and unfortunately some cities are missing large sections of data. The history database is populated by software which automatically processes hundreds of thousands of weather readings per day. Occasionally those readings are in a slightly different format than our software expects, and that results in missing or bad data. The weather readings are also sometimes inaccurate due to station trouble, or data transfer errors.

We constantly work on our history software to improve the data which is available. The best thing you can do about areas of inaccuracy you have already done, let us know! You can help us more if you provide information about exactly what information is bad or missing and what you are using the data for.

Other Sources of Historical Climatic Data:

The best source of climate data for the world is the National Climatic Data Center, located at:

http://www.ncdc.noaa.gov

Most of their data are free of charge for all .gov, .edu, .k12, .mil, and a few other specific domains, see:

http://cdo.ncdc.noaa.gov/cdo/info.html


Other options:

1) Every National Weather Service text product issued over the past ten years, including forecasts and coded METAR surface airport weather observations is available for free at the HDSS Access System:

http://has.ncdc.noaa.gov/pls/plhas/HAS.FileAppSelect?datasetname=9957ANX

2) There are 6 regional U.S. climate centers:

3) Many local National Weather Service (NWS) offices keep some climate data for their region on their web page. See http://www.nws.noaa.gov/organization.html for a list of all the web sites of local NWS offices.

4) Check if a public library in your area has the serial publication "Climatological Data". This monthly is published for each state and lists all official temperature, precipitation, snowfall, evaporation, soil temperature, etc. daily observations from the many weather stations in that state.

5) There is an excellent book called "The Weather Almanac" which has climatological data for 100 cities across the U.S. You should be able to find this at your local library.

6) A web alternative to "The Weather Almanac" can be found at:

http://www.cdc.noaa.gov/~cas/Climo/polys/states.txt.html

It has climate data for many US cities in a point and click interface. It is a great alternative to a weather almanac for looking up average temp, precip and snowfall, plus, many states have very cool "relief" maps as the top level, so you get a sense of the topography of the state.

7) Canadian climate data:

http://climate.weatheroffice.gc.ca/climateData/canada_e.html

8) International climate data:

http://www.worldweather.org

This site has links to the weather services of over 60 countries. Some of these weather services have climate data for that country. Also,

http://www.worldclimate.com

has climatic temperature and precipitation data for most world cities.

Other Types of Historical Data:


Historical storm data: http://www.spc.noaa.gov/climo


Sea Surface Temperature:

http://www.osdpd.noaa.gov/PSB/EPS/SST/contour.html (Sea Surface Temperature imagery from NOAA/NESDIS)

http://www.aoml.noaa.gov/phod/cyclone/data/at.html (Sea Surface Temperatures from NOAA/AOML, archived to Jan 2006.)

http://polar.ncep.noaa.gov/ofs/products.shtml? (SST forecasts, current speeds, and salinity)

http://www.osdpd.noaa.gov/ml/ocean/sst/anomaly.html (Difference in SST from normal)


Sunrise/Sunset, Moonrise/Moonset, Moon Phase, Moon illumination, Eclipses in the future or past:

http://aa.usno.navy.mil/data/docs/RS_OneDay.php


Wind Rose data showing climatological values of wind speed and direction for 237 U.S. cities can be found at: http://www.wcc.nrcs.usda.gov/climate/windrose.html


Historical pollen: http://www.aaaai.org/nab/

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