What is the effect of fog and rain on signals in the 10 meter and 6 meter bands?

The 10-meter and 6-meter amateur bands operate at frequencies of around 28 MHz and 50 MHz, respectively. At these frequencies, the physical wavelength of the radio signal is literally 10 meters and 6 meters long. Because the wavelengths are so large compared to the physical size of rain drops and fog particles, the radio waves easily pass around these tiny water droplets without interacting with them. Therefore, rain and fog do not significantly absorb, deflect, or scatter these signals. Weather effects like rain fade and heavy absorption typically only become a problem at much higher microwave frequencies (usually above 10 GHz). At those high frequencies, the signal wavelengths are small enough (measured in centimeters or millimeters) to physically interact with precipitation.