\documentclass{article}

\usepackage[latin1]{inputenc}
\usepackage{tikz}


\begin{document}

\def\temperaturedata{data/temperaturesOslo.txt}
\def\raindata{data/rainOslo.txt}

\tikzstyle{maxmark} = [mark=*,mark options={color=red,scale=15}]
\tikzstyle{minmark} = [mark=*,mark options={color=blue,scale=15}]

\pagestyle{empty}

\begin{tabular}{lllll}
    Temp. (${}^\circ$C) &%
    %
    %
    \begin{tikzpicture}[xscale=0.01, yscale=0.01]
        % Draw the zero line
        \draw[ultra thin, black!50] (1,0)--(365,0);
        % Draw average temperature
        \draw[ultra thin, black!20] (1,7.5)--(365,5.5);
        % Plot temperature data and mark the maximum temperature
        \draw[ultra thin] plot[smooth,maxmark, mark indices={192} ] 
            file {\temperaturedata};
        % Draw the minimum temperature mark.     
        \draw[ultra thin] plot[smooth,only marks, minmark, mark indices={61}] 
            file {\temperaturedata};
    \end{tikzpicture}
    %
    %
    & $\textcolor{blue}{-11.7^\circ}$ & 
    $\textcolor{black!50}{7.5^\circ}$ & 
    $\textcolor{red}{24.8^\circ}$\\
    Rain \hfill(mm) &%
    %
    % Draw rainfall data
    \begin{tikzpicture}[xscale=0.01, yscale=0.01]
        \begin{scope}[ycomb, yscale=0.6]
            \draw[black, thin] plot[] file {\raindata};
        \end{scope}
    \end{tikzpicture}
    %
    &  & $\textcolor{black!50}{1.5}$ & $\textcolor{red}{15}$\\
    &
    %
    % In this plot I use color coding to distinguish temperatures below
    % and above zero degrees. The plot is drawn twice and clipped to
    % achieve the desired effect. Visually the above plot is probably
    % better. 
    \begin{tikzpicture}[xscale=0.01, yscale=0.01]
        \draw[ultra thin, black!50] (1,7.5)--(365,5.5);
        \begin{scope}
            \clip (1,0) rectangle (365, 30);
            \draw[ultra thin,red] plot[smooth] file {\temperaturedata};
        \end{scope}
        \begin{scope}
        \clip (1,0) rectangle (365,-11.8);
        \draw[ultra thin, blue] plot[smooth] file {\temperaturedata};
        \end{scope}
    \end{tikzpicture}
    %
\end{tabular}

\end{document}