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The driest month of the year is October with an average of 107 mm (4.2 in) of precipitation over 15.5 days. The month with the most days of precipitation is May, with an average of 15.8, but with only 177 mm (7.0 in) of precipitation.
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During this month there is precipitation for an average of 15.5 days. The wettest month is June during which time Urnäsch receives an average of 210 mm (8.3 in) of precipitation. Urnäsch has an average of 161.6 days of rain per year and on average receives 1,803 mm (71.0 in) of precipitation. The historical population is given in the following table: Historical population Year In Urnäsch about 57.4% of the population (between age 25-64) have completed either non-mandatory upper secondary education or additional higher education (either university or a Fachhochschule). In the 2007 federal election the FDP received 70.6% of the vote. The senior population distribution is 276 people or 11.8% of the population are between 65–79 years old, and 118 people or 5.1% are over 80. Of the adult population, 143 people or 6.1% of the population are between 20–24 years old. The age distribution, as of 2000, in Urnäsch is 216 people or 9.2% of the population are between 0–6 years old. As of 2000, the gender distribution of the population was 50.6% male and 49.4% female. Most of the population (as of 2000 ) speaks German (93.0%), with Serbo-Croatian being second most common ( 2.3%) and Italian being third ( 1.0%). Over the last 10 years the population has decreased at a rate of -3%. Urnäsch has a population (as of 2008 ) of 2,268, of which about 11.6% are foreign nationals. The lowest elevation is the Murbach which is 722 m (2,369 ft), while the highest point is the Petersalp which is 1,590 m (5,220 ft). The elevation of the village is 838 meters (2,749 ft). Of the rest of the land, 3.4% is settled (buildings or roads) and the remainder (1.7%) is non-productive (rivers, glaciers or mountains). Of this area, 53.9% is used for agricultural purposes, while 41.1% is forested. View from the Kronberg over Urnäsch and Hundwil.