Where to find temperature history

Order Status. Find Help. Search Tool Search for and access past weather and climate data by station name or identifier, ZIP code, city, county, state, or country. Search Tool » Mapping Tool Find and view past weather and climate data by station name or identifier, ZIP code, city, county, state, or country.

The monthly mean temperature is calculated from the average of the mean daily maximum and mean daily minimum temperature i. Missing data more than two days missing in a month have been indicated by "". Sunshine data using a Kipp and Zonen sensor have been indicated by a " " after the value. All other sunshine data have been recorded using a Campbell-Stokes recorder.

Station data files are updated on a rolling monthly basis, around 10 days after the end of the month. Data are indicated as provisional until the full network quality control has been carried out.

After this, data are final. No allowances have been made for small site changes and developments in instrumentation. However, larger moves, such as a station moving from downtown to the city airport, generally result in the commissioning of a new station identifier. This tool treats each of these histories as a different station. In this way, it does not "thread" the separate histories into one record for a city. This tool provides simplistic counts of records to provide insight into recent climate behavior, but is not a definitive way to identify trends in the number of records set over time.

This is particularly true outside the United States, where the number of records may be strongly influenced by station density from country to country and from year to year. These data are raw and have not been assessed for the effects of changing station instrumentation and time of observation. The summaries below list the number of records broken for several recent periods is summarized in this table and updated daily.

Due to late-arriving data, the number of recent records is likely underrepresented in all categories, but the ratio of records warm to cold, for example should be a fairly strong estimate of a final outcome.

There are many more precipitation stations than temperature stations, so the raw number of precipitation records will likely exceed the number of temperature records in most climatic situations.