isophenomenal

Century Dictionary and Cyclopedia

1. Having the same or very similar phenomena; specifically.
2. In phenology, having the same dates of sprouting, budding, flowering, fruiting, ripening, etc.
3. In terrestrial magnetism, having the same magnetic declination, inclination, force, secular variation, diurnal variation, etc.
4. In meteorology, having the same frequency of cloudy or rainy weather, or similar atmospheric conditions in general.