C

#include <stdio.h>

int main(){
    FILE *input, *output;
    float maxtemp=0, mintemp = 0, maxwind_speed=0, minwind_speed=0, maxwind_chill, minwind_chill, temp, wind_dir, wind_speed, wind_chill;
    int reals=0, counter=0;

    input = fopen("input.txt","r"); //assigning file to a variable
    while(fscanf(input,"%f %f %f %f \n", &temp, &wind_dir, &wind_speed, &wind_chill) != EOF){ //the loop will continue untill it will be the End Of File
        reals += 4;
        counter += 1;
        maxtemp = max(maxtemp, temp);
        printf("%f %f\n", maxtemp);
    }

    fclose(input);
    printf("There are %i succesfuly read real numbers.\n", reals);
    printf("Max. temperature: %2.1f C\nMin. temperature: %2.1f C\n", maxtemp, mintemp);

    return 0;
}

max(x, y){
    if (x < y){
       x = y;
    }
    return x;
}