The purpose of this post is merely to catalogue counts of all-time record highs and lows (high maximums\high minimums\low minimums\low maximums) coming into the National Center for Environmental Information’s site and all related charts and graphs produced in my Excel files for those data sets for the state of California. All-time records are the highest or lowest temperatures recorded over the entire time a station has been recording data. For example, the all-time record hottest maximum temperature for Atlanta Hartsville-Jackson Airport was 106F set on 6/30/2012. I am in the process of constantly updating this data verifying the 2009 Meehl et. all surface Records published in geophysical Science that I initiated from 2000. Each individual count could be a tied surface record or one broken by several degrees Fahrenheit. Here is the link to the NCEI site:
https://www.ncdc.noaa.gov/cdo-web/datatools/records
More from NCEI:
The daily records summarized here are compiled from a subset of stations in the Global Historical Climatological Network. A station is defined as the complete daily weather records at a particular location, having a unique identifier in the GHCN-Daily dataset.
For a station to be considered for any parameter, it must have a minimum of 30 years of data with more than 182 days complete each year. This is effectively a “30-year record of service” requirement, but allows for inclusion of some stations which routinely shut down during certain seasons. Small station moves, such as a move from one property to an adjacent property, may occur within a station history. 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.
An updated 2015 study from Dr. Jerry Meehl indicates that the ratio of daily records from year to year will average around 15 to 1 by 2100:
Per one of the authors of both the 2009 and 2015 studies, Claudia Tebaldi said “This climate is on a trajectory that goes somewhere we’ve never been. And records are a very easy measure of that.”
All of the data listed below is part of this one chart. The ratio of all-time record maxes to all-time low minimums is higher (so far) for the 2020s than any other decade since the 1910s:
Here are the current all-time record counts of high maximums and low minimums per decade that went into the above chart:
The 2020s (Through July 2024):
The rankings are for the lower 48 states with the warmest ranking since 1895 of average temperatures, being 130 and 1 being the coldest as of 2024. Blue colors represent cold months and red warm. Those months with counts close to a 1 to 1 ratio of highs to lows are colored black. I have opted not to catalogue data prior to 1910 since record counts decrease substantially prior to the decade of the 1900s. NCEI Rankings individual months and years are listed on each chart. Rankings between 54-74 are color coded black, or near average.
All-time warmest or coldest months and years are color coded purple. New this update: Temperature anomalies from 1901-2000 have been added on charts.
Time stamps for when I last updated counts are located in the upper left-hand corner of each chart. Drop me a note if you see an error or if you have suggestions for improvements.
The 2010s:
The 2000s:
The 1990s:
The 1980s:
The 1970s:
The 1960s:
The 1950s:
The 1940s:
The 1930s:
The 1920s:
The 1910s:
The following all-time record high min/low max charts rankings are for the state of California with the warmest ranking since 1895 of average temperatures, being 130 and 1 being the coldest as of 2024. Blue colors represent cold months and red warm. Those months with counts close to a 1 to 1 ratio of highs to lows are colored black. I have opted not to catalogue data prior to 1910 since record counts decrease substantially prior to the decade of the 1910s. NCEI Rankings individual months and years are listed on each chart. Rankings between 55-75 are color coded black, or near average.
All-time warmest or coldest months and years are color coded purple. New this update: Temperature anomalies from 1901-2000 have been added on charts.
Time stamps for when I last updated counts are located in the upper left-hand corner of each chart. Drop me a note if you see an error or if you have suggestions for improvements.
All of the data listed below is part of this one chart. The ratio of monthly record high minimums to low maximums for the 2020s (so far) are higher than any other decade since the 1910s:
Here are the current all-time record counts per decade, which have gone into the prior chart:
The 2020s (through July 2024):
The 2010s:
The 2000s:
The 1990s:
The 1980s:
The 1970s:
The 1960s:
The 1950s:
The 1940s:
The 1930s:
The 1920s:
The 1910s:
This is all of the NCEI all-time state of California counts of reported records back through January 1910.
Guy Walton…”The Climate Guy“