A tabulated ratio of record highs to record lows: a useful marker for on-going climate warming in the United StatesInternational Research Institute for Climate and SocietyInternational Research Institute for Climate and Society—An Update
The trend of the simple high/low temperature ratio does in fact show a value near 1:1 in the early 1980's that then rises well above 2:1 as it approaches present time. Most recently for the early part of this decade the ratio has risen to near 3:1. The rate of increase in the ratio over the period from the early 1980's amounts to about 4-5% annually. The week to week noise or variability of the high/low ratio is pronounced, but with time averaging over seasons or years, the ever increasing ratio readily emerges from the data. The High/Low ratio statistic is the centerpiece of the climate scorecards for such organizations as Climate Central. It also provides a concrete linkage between climate and weather, which is often in short supply in the broader discussion on AGW. This presentation will be an update on how the Meehl Records Study has been verifying since 2009.