To integrate an NTC temperature sensor into your existing digital clock code, you need to add the necessary code to read the temperature from the sensor and display it on your LED matrix display. Below is the updated code with the NTC temperature sensor integrated:

```cpp
#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <DHT.h>
#include <SPI.h>
#include <Wire.h>
#include "Font7Seg.h"

// Define the number of devices we have in the chain and the hardware interface
#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
#define MAX_DEVICES 4 // Define the number of displays connected
#define CLK_PIN    13 // CLK or SCK
#define DATA_PIN   11 // DATA or MOSI
#define CS_PIN     10 // CS or SS
#define SPEED_TIME 75 // Speed of the transition
#define PAUSE_TIME  0
#define MAX_MESG   20

// These are for the clock
#define DS1307_ADDRESS 0x68

// These are for the temperature
#define DHTPIN 2
#define DHTTYPE DHT22
#define TIMEDHT 1000

#define NTC_PIN A0 // Analog pin for NTC temperature sensor

// Global variables
uint8_t wday, mday, month, year;
uint8_t hours, minutes, seconds;

char szTime[9];    // mm:ss\0
char szMesg[MAX_MESG + 1] = "";

float humidity, celsius, fahrenheit, ntcTemperature;

uint8_t degC[] = { 6, 3, 3, 56, 68, 68, 68 }; // Deg C
uint8_t degF[] = { 6, 3, 3, 124, 20, 20, 4 }; // Deg F

uint8_t clear = 0x00;

uint32_t timerDHT = TIMEDHT;

DHT dht(DHTPIN, DHTTYPE);

// Hardware SPI connection
MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);

void beginDS1307()
{
  // Read the values ​​(date and time) of the DS1307 module
  Wire.beginTransmission(DS1307_ADDRESS);
  Wire.write(clear);
  Wire.endTransmission();
  Wire.requestFrom(DS1307_ADDRESS, 0x07);

  seconds = bcdToDec(Wire.read());
  minutes = bcdToDec(Wire.read());
  hours = bcdToDec(Wire.read() & 0xff);
  wday = bcdToDec(Wire.read());
  mday = bcdToDec(Wire.read());
  month = bcdToDec(Wire.read());
  year = bcdToDec(Wire.read());
}

uint8_t decToBcd(uint8_t value)
{
  return ((value / 10 * 16) + (value % 10));
}

uint8_t bcdToDec(uint8_t value)
{
  return ((value / 16 * 10) + (value % 16));
}

// Code for reading clock time
void getTime(char *psz, bool f = true)
{
  sprintf(psz, "%02d%c%02d", hours, (f ? ':' : ' '), minutes);
}

// Code for reading clock date
void getDate(char *psz)
{
  char  szBuf[10];
  sprintf(psz, "%d %s %04d", mday , mon2str(month, szBuf, sizeof(szBuf) - 1), (year + 2000));
}

// Code for get Temperature
void getTemperature()
{
  // Wait for a time between measurements
  if ((millis() - timerDHT) > TIMEDHT) {
    // Update the timer
    timerDHT = millis();

    // Reading temperature or humidity takes about 250 milliseconds!
    // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
    humidity = dht.readHumidity();

    // Read temperature as Celsius (the default)
    celsius = dht.readTemperature();

    // Read temperature as Fahrenheit (isFahrenheit = true)
    fahrenheit = dht.readTemperature(true);

    // Read temperature from NTC sensor
    int raw = analogRead(NTC_PIN);
    double resistance = 10000.0 / ((1023.0 / raw) - 1.0);
    ntcTemperature = log(resistance / 10000.0) / 3950.0 + 1.0 / (25 + 273.15);
    ntcTemperature = 1.0 / ntcTemperature - 273.15;

    // Check if any reads failed and exit early (to try again)
    if (isnan(humidity) || isnan(celsius) || isnan(fahrenheit)) {
      Serial.println("Failed to read from DHT sensor!");
      return;
    }
  }
}

// Get a label from PROGMEM into a char array
char *mon2str(uint8_t mon, char *psz, uint8_t len)
{
  static const __FlashStringHelper* str[] =
  {
    F("Jan"), F("Feb"), F("Mar"), F("Apr"),
    F("May"), F("Jun"), F("Jul"), F("Aug"),
    F("Sep"), F("Oct"), F("Nov"), F("Dec")
  };

  strncpy_P(psz, (const char PROGMEM *)str[mon - 1], len);
  psz[len] = '\0';

  return (psz);
}

char *dow2str(uint8_t code, char *psz, uint8_t len)
{
  static const __FlashStringHelper* str[] =
  {
    F("Sunday"), F("Monday"), F("Tuesday"),
    F("Wednesday"), F("Thursday"), F("Friday"),
    F("Saturday")
  };

  strncpy_P(psz, (const char PROGMEM *)str[code - 1], len);

  psz[len] = '\0';

  return (psz);
}

void setup(void)
{
  Wire.begin();

  P.begin(2);
  P.setInvert(false);

  P.setZone(0,  MAX_DEVICES - 4, MAX_DEVICES - 1);
  P.setZone(1, MAX_DEVICES - 4, MAX_DEVICES - 1);

  P.displayZoneText(1, szTime, PA_CENTER, SPEED_TIME, PAUSE_TIME, PA_PRINT, PA_NO_EFFECT);
  P.displayZoneText(0, szMesg, PA_CENTER, SPEED_TIME, 0, PA_PRINT , PA_NO_EFFECT);

  P.addChar('$', degC);
  P.addChar('&', degF);

  dht.begin();
}

void loop(void)
{
  static uint32_t lastTime = 0; // Memory (ms)
  static uint8_t  display = 0;  // Current display mode
  static bool flasher = false;  // Seconds passing flasher

  beginDS1307();
  getTemperature();

  P.displayAnimate();

  if (P.getZoneStatus(0))
  {
    switch (display)
    {
    case 0: // Temperature deg Celsius from DHT sensor
      P.setPause(0, 0, 1000);
      P.setTextEffect(0, PA_SCROLL_LEFT, PA_SCROLL_UP);
      display++;
      dtostrf(celsius, 3, 1, szMesg);
      strcat(szMesg, "$");

      break;
    case 1: // Temperature deg Fahrenheit from DHT sensor
      P.setTextEffect(0, PA_SCROLL_UP, PA_SCROLL_DOWN);
      display++;
      dtostrf(fahrenheit, 3, 1, szMesg);
      strcat(szMesg, "&");

      break;
    case 2: // Humidity from DHT sensor
      P.setTextEffect(0, PA_SCROLL_DOWN, PA_SCROLL_LEFT);
      display++;
      dtostrf(humidity, 3, 0, szMesg);
      strcat(szMesg, "%UR");

      break;
    case 3: // Temperature from NTC sensor
      P.setTextEffect(0, PA_SCROLL_LEFT, PA_SCROLL_LEFT);
      display++;
      dtostrf(ntcTemperature, 3, 1, szMesg);
      strcat(szMesg, "$");

      break;
    case 4: // Clock
      P.setFont(0, numeric7Seg);
      P.setTextEffect(0, PA_PRINT, PA_NO_EFFECT);
      P.setPause(0, 0);

      if ((millis() - lastTime) >= 1000)
      {
        lastTime = millis();
        getTime(szMesg, flasher);
        flasher = !flasher;
      }

      if ((seconds == 00) && (seconds <= 30)) {
        display++;
        P.setTextEffect(0, PA_PRINT, PA_WIPE_CURSOR);
      }

      break;
    case 5: // Day of week
      P.setFont(0, nullptr);
      P.setTextEffect(0, PA_SCROLL_LEFT, PA_SCROLL_LEFT);
      display++;
      dow2str(wday, szMesg, MAX_MESG);

      break;
    default: // Calendar
      P.setTextEffect(0, PA_SCROLL_LEFT, PA_SCROLL_LEFT);
      display = 0;
      getDate(szMesg);

      break;
    }

    P.displayReset(0); // Reset zone zero
  }
}