Although weather is just one factor, it can really affect your travel plans, especially if you are planning a longer stay in Postville. The hottest months are usually July and August, with an average temperature of 20°C, while the coldest months are January and February, with an average of -4°C. The snowiest months in Postville are January, March, April and February, with each month seeing an average of 16 cm of snowfall.