Made August 2023/Updated October 2023
The purpose of this post is merely to catalogue counts of monthly record reports (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 data sets from Sweden. A monthly record report would be one for the most extreme temperature reading reported during one individual month during a calendar year. Each individual station would only have 12 monthly records for high maximums (only one per month), for example.
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 2000-2009. Each individual count could be a tied surface record or one broken by several degrees Fahrenheit. Here is the link to the NCEI site:
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.”
All counts include ties of records.
An updated 2016 study from Dr. Jerry Meehl indicates that the ratio from year to year will average around 15 to 1 by 2100 for the United States:
Per one of the authors of both the 2009 and 2016 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. So far, the ratio of monthly record high maxes to low minimums for the 2020s is higher than any other decade since the 1910s:
Here are the current monthly record counts per decade, which have gone into the prior chart:
In this genome 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 am searching for a database that contains rankings for Mexico, so spaces for rankings are blank for now. I have opted not to catalogue data prior to 1910 for Sweden since record counts decrease substantially prior to that year. 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.
For the following charts of counts of monthly high minimums and low maximums 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 year 1912. Average temperature ranking slots are left blank. Please drop me a note if you spy a good site for those from Sweden, and I’ll add those during a future update. 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 monthly record counts per decade:
The 2020s through September 2023:
This is all of the monthly record count data for the Sweden in the NCEI database back to 1910.
Guy Walton…”The Climate Guy”