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Table 1 Sea surface temperature (SST) collected by lighthouse keepers (century 1) compared to National Data Buoy Center (NDBC) fixed-sensor SST (FWYF1; century 2) at Fowey Rocks Lighthouse and thermograph SST (century 2) at Carysfort Lighthouse, respectively. P-values are reported for two-sample Student’s t tests comparing the centuries. For tests where variance was unequal, a P-value is reported (in italics) using Satterthwaite’s method assuming unequal variance. P-values < 0.004 are in bold, denoting statistical significance as per the Bonferroni adjustment

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

Month Century Fowey: lighthouse keeper vs. FWYF1 Carysfort: lighthouse keeper vs. thermograph
N (years) Mean SST (°C) SE (°C) P-value Warming (°C) N (years) Mean SST (°C) SE (°C) P-value Warming (°C)
JAN 1 29 22.3 0.23    21 22.6 0.33   
2 20 23.2 0.19 0.006 0.9 14 23.5 0.25 0.038 0.9
FEB 1 30 22.5 0.24    21 23.0 0.20   
2 21 23.1 0.18 0.025 0.6 14 23.4 0.18 0.18 0.4
MAR 1 31 23.2 0.20    20 23.2 0.21   
2 20 23.7 0.20 0.076 0.5 14 23.8 0.24 0.044 0.6
APR 1 32 24.5 0.21    21 24.1 0.16   
2 20 24.9 0.14 0.064 0.4 14 25.0 0.19 0.0013 0.9
MAY 1 32 25.8 0.26    21 25.8 0.18   
2 21 26.6 0.14 0.011 0.8 14 26.8 0.15 0.0003 1.0
JUN 1 32 27.4 0.25    21 27.5 0.16   
2 19 28.3 0.11 0.001 0.9 14 28.5 0.12 < 0.0001 1.0
JUL 1 32 28.6 0.24    20 28.7 0.14   
2 19 29.5 0.09 0.001 0.9 13 29.6 0.12 0.0001 0.9
AUG 1 32 29.0 0.18    20 29.1 0.17   
2 20 29.9 0.09 0.0002 0.9 14 30.1 0.11 < 0.0001 1.0
SEP 1 32 28.6 0.17    20 28.8 0.14   
2 21 29.3 0.07 0.0002 0.7 14 29.4 0.10 0.0007 0.6
OCT 1 31 27.2 0.13    22 27.3 0.15   
2 21 27.9 0.10 0.0001 0.7 14 27.9 0.12 0.0028 0.6
NOV 1 31 25.1 0.20    22 25.5 0.20   
2 21 26.0 0.10 0.0005 0.9 14 26.0 0.10 0.018 0.5
DEC 1 31 23.2 0.26    21 24.0 0.21   
2 22 24.5 0.13 0.0001 1.3 14 24.5 0.15 0.055 0.5