I’m not sure what you mean by this.
Reporting the current conditions (which is what your system aims to do) is very different from forecasting what the weather will be doing at some point in the future.
Any data based on the DHT11 sensor is going to be fairly inaccurate, as the values for temperature are +/- 2 % (4) overall) and humidity are +/- 5% (10% overall). A great deal also depends on how you house the sensors that you’re using, as temperature readings should be taken in the shade and humidity sensors need to be protected from direct rain and condensation whilst still being able to measure the moisture content of the air.
I originally used a BME280 sensor for my weather station, but eventually switched to an SHT30 waterproof sensor like this…
in a suitable housing, like the one here…
Pete.