ERA5 Grib t2m correlates well with NOAA air_temp at Hamilton, TN

 source code:  
https://github.com/QinLab/COVID19_transmission_MS/blob/main/hamiltonTN_compare_T2m_NOAA.Rmd 

Call:
lm(formula = tb_comp$K ~ tb_comp$air_temp)

Residuals:
    Min      1Q  Median      3Q     Max 
-4.7346 -0.9967 -0.0165  0.9527  7.6325 

Coefficients:
                  Estimate Std. Error t value Pr(>|t|)    
(Intercept)      271.41583    0.14303  1897.6   <2e-16 ***
tb_comp$air_temp   0.96368    0.00688   140.1   <2e-16 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 1.492 on 597 degrees of freedom
Multiple R-squared:  0.9705,	Adjusted R-squared:  0.9704 
F-statistic: 1.962e+04 on 1 and 597 DF,  p-value: < 2.2e-16