Measured temperature is about 7-8 degrees(in Celsius) less than the real temperature

[abattya]

Hello, the code works for me, but i measure around 24-25 Celsius, but there is only 18 degress here. I use 3.3V supply(but i also tried with 5V) and a 10k resistor between data and VCC.
What can I do?

• board: ESP32 DEVKIT C

• Arduino IDE version (found in Arduino -> About Arduino menu): 1.8.19

CODE:

#include <DHT.h>
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

float h = 0;
float t = 0;

void setup() {
Serial.begin(9600);
dht.begin();

}

void loop() {

if (isnan(h)) {
Serial.println("Failed to read Humidity from DHT sensor!");
return;
}

if (isnan(t)) {
Serial.println("Failed to read celsius from DHT sensor!");
return;

}
h= dht.readHumidity();
t= dht.readTemperature();

Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print("°% ");
Serial.print(F("Temperature: "));
Serial.print(t);
Serial.println("°C ");

delay(3000);
}

[caternuson]

What is measuring 18 degrees? How close together is that device and the DHT22?