Not only that, but even the thermometers used to measure the comparison temperatures may not be in the same locations or use the same technology for measurement. Since the thermometers used over the last 100 years may not have had the same accuracy, precision, or calibration as those used today.
Not only that, but even the thermometers used to measure the comparison temperatures may not be in the same locations or use the same technology for measurement. Since the thermometers used over the last 100 years may not have had the same accuracy, precision, or calibration as those used today.