thornthwaite() not working as in previous versions of the package

[VeruGHub]

Hi,
Me and @prebollo are trying to calculate ETP for Castilla y León using thornthwaite(). I have noticed that the function is not working as before, since you cannot calculate ETP for just one temperature value. Maybe I am missing something but could you confirm if something is going wrong? Thanks! Here a reproduccible example:

library(SPEI)
#> # Package SPEI (1.8.1) loaded [try SPEINews()].

meantemp <- c(2.18, 12.19, 27.33)
lati <- 41.47

thornthwaite(Tave = meantemp, lat = lati) #Ok
#> [1] "Checking for missing values (`NA`): all the data must be complete. Input type is vector. Assuming the data are monthly time series starting in January, all regular (non-leap) years."
#> [1]  15.40596  59.55327 139.12358

thornthwaite(Tave = meantemp[1], lat = lati) #It worked before with just one temperature value
#> [1] "Checking for missing values (`NA`): all the data must be complete. Input type is vector. Assuming the data are monthly time series starting in January, all regular (non-leap) years."
#> Error in apply(Tt, c(2, 3), function(x) {: 'MARGIN' does not match dim(X)

^{Created on 2023-07-26 with reprex v2.0.2}