Vertical alignment of table text

Question

I'm trying to align my table text vertically:

MWE:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{array,pifont,xcolor}
\newcolumntype{C}[3]{@{\hspace*{#1}}>{\centering\arraybackslash}m{#2}@{\hspace*{#3}}}
\newcolumntype{R}[2]{>{\raggedleft\arraybackslash}m{#1}@{\hspace*{#2}}}
\newcolumntype{L}[2]{@{\hspace*{#1}}>{\raggedright\arraybackslash}m{#2}}
\newcommand{\fajfka}{\textcolor[RGB]{0,166,79}{\ding{51}}}
\newcommand{\krizek}{\textcolor[RGB]{237,27,35}{\ding{55}}}
\newcommand{\degC}{$^\circ$C}
\begin{document}

\begin{tabular}{
  |R{70pt}{5pt}
  *{9}{|C{0pt}{20pt}{0pt}}|}
  \hline
  \multicolumn{1}{|C{6pt}{70pt}{0pt}|}{\textbf{\o\,\,= 2mm}} & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & \textbf{v} \\[4pt]
  \cline{1-10}
  300\degC & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka \\[4pt]
  \cline{1-9}
  290\degC & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka \\[4pt]
  \cline{1-9}
  280\degC & \krizek & \krizek & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka \\[4pt]
  \cline{1-9}
  270\degC & \krizek & \krizek & \krizek & \krizek & \krizek & \krizek & \krizek & \krizek \\[4pt]
  \cline{1-9}
  \textbf{t {[}\degC{]}} \\[4pt]
  \cline{1-1}
\end{tabular}

\end{document}

As seen, last visible column cell resp. last visible row cells are not vertically centered. Those can be also centered only if there are visible some other cell borders in those column, row.
How can I vertically center text in every visible cell?

Answer 1

m columns and [..] argument to \\ work in well specified ways, but they don't work well together or how people always expect. I'd avoid both here:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{array,pifont,xcolor}
\newcolumntype{C}[3]{@{\hspace*{#1}}>{\centering\arraybackslash}p{#2}@{\hspace*{#3}}}
\newcolumntype{R}[2]{>{\raggedleft\arraybackslash}p{#1}@{\hspace*{#2}}}
\newcolumntype{L}[2]{@{\hspace*{#1}}>{\raggedright\arraybackslash}p{#2}}
\newcommand{\fajfka}{\textcolor[RGB]{0,166,79}{\ding{51}}}
\newcommand{\krizek}{\textcolor[RGB]{237,27,35}{\ding{55}}}
\newcommand{\degC}{$^\circ$C}
\begin{document}

{\renewcommand\arraystretch{1.5}
\begin{tabular}{
  |R{70pt}{5pt}
  *{9}{|C{0pt}{20pt}{0pt}}|}
  \hline
  \multicolumn{1}{|C{6pt}{70pt}{0pt}|}{\textbf{\o\,\,= 2mm}} & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & \textbf{v} \\
  \cline{1-10}
  300\degC & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka \\
  \cline{1-9}
  290\degC & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka \\
  \cline{1-9}
  280\degC & \krizek & \krizek & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka & \fajfka \\
  \cline{1-9}
  270\degC & \krizek & \krizek & \krizek & \krizek & \krizek & \krizek & \krizek & \krizek \\
  \cline{1-9}
  \textbf{t {[}\degC{]}} \\
  \cline{1-1}
\end{tabular}}

\end{document}