Atmospheric refractivity at Abuja was investigated for disturbed days and quiet
days during dry and rainy season. The result of the investigation showed that refractivity
variation for disturbed and quiet days during dry and wet season over Abuja are governed by
the changes in atmospheric parameters which conversely cause changes in refractive index.
The correlation of refractivity with pressure, temperature and relative humidity for disturbed
and quiet days indicated that relative humidity and pressure as well as temperature have great
correlation effect for disturbed and quiet day in wet season as well as in dry season.