Thanks. Are you aware of the elevation/location of the experiment, the type of instruments used, and the frequency of said measurements? This information would be very helpful to me.
The weather station was located somewhere on the crater rim and readings were taken continuously. Unfortunately, I do not know the type of instruments used. This was an experiment from ~40 years ago. Because I am so interested in mountain weather, I obtained the temperatures from the NPS Visitor Center in the 1980's. It wasn't until years later learned that the data came originally from a University of Washington Study in the 1970's when I inquired about it in a weather forum and someone provided me the information. It may be best to contact the University itself. I wish I had the extremes for each month, rather than just the averages.
Unfortunately, much of the weather data is hard to obtain from non-official stations (including the data for Peter Sinks, the topic of this forum).
For Pikes Peak, for example, Larry Dunn compiled all the data by hand in the basement of some weather office in Colorado Springs.
For some stations, I painstakingly dug for any information I could gather for the website, so it will be easily obtainable for anyone. For SNOTEL sites, Camp Muir, etc., for example, I don't think averages are available. Daily data is. I actually calculated all that information by hand! Not only that, all the data used to be in metric for the SNOTEL sites and I had to convert it!
To show how much work some of it was, here is just one except of one of my hundreds of pages compiled on a random SNOTEL site (Five Point Lake in the Uinta Mountains):
Before the internet, I had to gather data by hand at libraries and archives and I compiled hundreds of notebooks of information. For example, here is a section of one notebook I have on some weather for mountain top locations in the Wasatch:
So, a lot of the data, I had to calculate using any sources deemed accurate. (PS, I am currently trying to put enter the data for the weather station at about 14K on Denali if anyone wants to help!).
I do not know what type of equipment was used for recording the weather data; I only obtained the data. I always try to be as accurate as possible with it and it was a lot of work to obtain. I hope that people find my webpages useful as my own motivation is only to share often hard to obtain weather data for remote locations and it was a lot of work to compile.
The spreadsheet you were referring to with the mountain data might not look like much, but it was actually a labor of love that took many hours of work over several years to compile. The sources given don't mean that it was a simple google search that provided the data; much of it had to be compiled over a period of several years, and by hand.
Information in the official NOAA NOW database is much easier to obtain!
I have no doubt that, on a complete yearly basis, Rainier is colder than Washington. The prevailing summer streamflow gradient(s) Mt. Washington experiences during the summer results in both a warmer boundary layer, and higher tropopause in general. In winter, the opposite is true, with a much lower tropopause and significantly colder climatological boundary layer.
All data I have seen indicated that Mount Washington has lower extremes, but Mount Rainier is colder on average, even in winter (though they are more evenly matched in winter).
Mount Rainier is more consistently cold in winter, while the temperature fluctuates more on Mount Washington, on both the "warm" and cold sides.
During the time the weather station existed on Rainier, for example, the coldest temperature recorded was -36F. During the same time period, Mt Washington either matched or exceeded that reading in three years (-36F in 1971, -44F in 1976, and -38F in 1979) and of course many, many times outside those years. So Mt Washington definitely has lower extremes (and higher ones as well).
Even on Pikes Peak, and more so on Rainier though, the temperatures don't get as warm in winter as they do on Mt Washington. The temperature on Mount Washington actually rises above freezing periodically in most winters, and occasionally even rises into the 40's). It doesn't do so on Rainier of Pikes Peak (Pikes Peak has never recorded a temperature as warm as freezing in December, January, and February; I don't know what the winter extreme for Rainier is).
So, Mt Washington gets both colder and warmer in winter than Pikes Peak or Rainier, even though the average temperature is a bit warmer in winter on Mt Washington (though it would be interesting to compare wind-chills rather than just actual temperatures).
Anyway, Mt Rainier is a bit colder than Mt Washington in winter, but only because of the much greater elevation. At similar elevations, there is no contest.
Here is the weather data (almost 100 years worth) for the Paradise Ranger Station, located 9000 feet below Rainier's summit:
It is 800 feet or so lower than Mt Washington, but much warmer. However, since it is 9000 feet below Rainier's summit, it is reasonable to assume that the summit of Rainier should be much colder than down at Paradise.
Although the weather data is limited, the 1970's weather data indicates that the average temperature on Rainier was 2F in January. This is 26.4F colder than the average January temperature at Paradise RS, which is 9000 feet lower.
A 26.4F temperature change (which is 2.9F per thousand feet) sounds very reasonable. I would assume that the data is accurate.
I would assume that you would agree that a 2.9F temperature drop per thousand feet would be reasonable?