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Table 2 Hen and Chickens Reef underwater (≈4-m depth) temperature, 1975 to 2007. Results are reported for the linear regression of monthly means vs. time (years). The plus symbol indicates a statistically significant warming trend, and the P-value is the probability that the trend could be due to chance alone. P-values at or less than 5 % are in italic. The equal symbol indicates that there was not a significant trend detected

From: A Century of Ocean Warming on Florida Keys Coral Reefs: Historic In Situ Observations

Month N (years) Trend P-value Slope (°C year−1) Estimated warming (°C)
Jan 23 + 0.05 0.055 1.8
Feb 22 + 0.04 0.067 2.1
Mar 22 + 0.05 0.043 1.4
Apr 20 = 0.31 0.022 0.7
May 20 = 0.15 0.027 0.9
Jun 19 + 0.02 0.041 1.3
Jul 21 = 0.18 0.018 0.6
Aug 22 + 0.003 0.039 1.2
Sep 21 = 0.16 0.018 0.6
Oct 20 = 0.57 0.010 0.3
Nov 21 = 0.81 −0.004 −0.1
Dec 22 = 0.60 0.011 0.4