spelling correction (openclimatefix#189)

README.md

@@ -88,7 +88,7 @@ The 9 NWP variables, from Open-Meteo documentation, are mentioned above with the
 1. **Visibility (km)**, or vis: Distance at which objects can be clearly seen. Can affect the amount of sunlight reaching solar panels.
 2. **Wind Speed at 10 meters (km/h)**, or si10 : Wind speed measured at a height of 10 meters above ground level. Important for understanding weather conditions and potential impacts on solar panels.
 3. **Temperature at 2 meters (°C)**, or t : Air temperature measure at 2 meters above the ground. Can affect the efficiency of PV systems.
-4. **Precipiration (mm)**, or prate : Precipitation (rain, snow, sleet, etc.). Helps to predict cloud cover and potentiel reductions in solar irradiance.
+4. **Precipitation (mm)**, or prate : Precipitation (rain, snow, sleet, etc.). Helps to predict cloud cover and potentiel reductions in solar irradiance.
 5. **Shortwave Radiation (W/m²)**, or dswrf: Solar radiation in the shortwave spectrum reaching the Earth's surface. Measure of the potential solar energy available for PV systems.
 6. **Direct Radiation (W/m²)** or dlwrf: Longwave (infrared) radiation emitted by the Earth back into the atmosphere. **confirm it is correct**
 7. **Cloud Cover low (%)**, or lcc: Percentage of the sky covered by clouds at low altitudes. Impacts the amount of solar radiation reachign the ground, and similarly the PV system.