The climate of an area is defined by the 30-year average of high, low, and daily average of temperatures, precipitation, wind, etc. of a location. 

Climate takes into account extremes of weather at a location like daily, monthly, and annual record high and low temperatures. This includes peak wind gusts and precipitation records as well.  All of this weather data gives us the climate for a locale.  

When it comes to climate there is only one constant.  It is constantly changing over time.  The Earth's climate is and has always been in a constant state of flux since its creation some 4.543 billion years ago.

Here in Rochester, detailed daily weather data is measured at the Rochester airport and is compiled by the National Weather Service.  This data has been regularly recorded since the 1870s.  Prior to that we can only rely on news stories or ships logs to get an idea of what the climate was like.

The 30-year average of daily weather data resets every decade.  Our current period of record for climate averages at the Rochester airport runs from 1981 to 2010.

As the climate is different from one community to the next, it's unfortunate we don’t have detailed records for every one of our communities.  For example, it could be 45 degrees driving on Edgemere Drive in the spring while in Brighton it's 70.  You could be going from a lake-effect blizzard in Webster to blue sky and sunshine in Rochester.  In the summer most of our precipitation comes from scattered showers and storms.  One community can have browned out lawns with little rain for weeks on end while another has had over a foot of rain and flash flooding. Get the idea?

Now specifically for Rochester, this past June was hot and dry, relative to average.

The month was 1.7 degrees above the 30-year average of 67.9.  The highest temperature of the month, 94 was on the 11th.  The coldest was 41 on the 14th.

We received 1.48 inches of rain, 1.74 inches below the 30 year average of 3.22.

No snow was recorded, but hey, its happened before!

A more detailed look at the numbers for June, or any year of record can be found here.