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Lancaster: Annual Weather Averages. July is the hottest month in Lancaster with an average temperature of 16Â°C (60Â°F) and the coldest is January at 4Â°C (40Â°F) with the most daily sunshine hours at 7 in May. The wettest month is February with an average of 34.6mm of rain. Loading weather data.
Lancaster PA Weather â Current Weather & Forecast. Lancaster PA Weather Forecast. Below that youâll see a graphic showing the current weather in Lancaster. You also have the option of checking the weather forecast for later in the day or evening as well as a 4-6 day weather forecast. Average Temperatures for Lancaster PA This table shows the average temperature ranges for Lancaster County for each month of the year, along with the average precipitation for each month.