how many instances of "n" are there in:
located at an elevation of 1514.94 meters (4970.28 feet) above sea level, butambamo has a temperate highland tropical climate with dry winters climate (classification: cwb). the district’s yearly temperature is 20.15ºc (68.27ºf) and it is -0.29% lower than rwanda’s averages. butambamo typically receives about 293.9 millimeters (11.57 inches) of precipitation and has 306.15 rainy days (83.88% of the time) annually.
the chart below shows the mean monthly temperature and precipitation of butambamo in recent years.

user
In that passage, there are twenty occurrences of the letter "n."
assistant