Final answer:
Rain would likely continue in Portland if the temperatures remain steady, as its climate generally has rainy conditions when temperatures are above freezing. Snow or freezing rain require lower temperatures which are not indicated by the steady temperature assumption.
Step-by-step explanation:
Assuming the temperature at Portland remains steady, rain would likely continue there. This is because Portland's climate typically involves rainy conditions when temperatures are stable and above freezing. The different forms of precipitation including rain, snow, drizzle, and freezing rain, all depend on the atmospheric conditions, particularly temperature.
Freezing rain occurs when there is a layer of warmer air above a sub-freezing layer near the ground, causing the rain to freeze upon contact with surfaces. As the question implies steady temperature, which is usually above freezing in Portland, continuing rain is the most likely form of precipitation without a drop in temperature to allow snow or freezing rain.