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City of Lino Lakes SWMP | February 8, 2013 Draft | 11 3.3. Climate & Precipitation The climate of Lino Lakes is similar to the climate for the overall Seven County Metropolitan Area which exhibits the typical characteristics of continental climates. Areas with continental climates have winters with at least one month below 32° F and at least three months of temp eratures above 50° F. Regions with continental climates are characterized by winter temperatures cold enough to support snow cover from late fall to early spring, and relatively moderate precipitation that occurs mostly in the summer months. Climate d ata w as collected by the National Weather Service Cooperative at the Minneapolis -St. Paul International Airport (Station 215435) and supplemented with data from the St. Paul station (station 217377) to fill gaps in the snowfall record . The data summary of prec ipitation, snowfall, and temperature presented in Table 1 covers the 30 years between 1981 and 2010. The average annual temperature is 46.2 degrees F. Average annual precipitation is 30.6 inches, including approximately 5 1.6 inches of snowfall (Table 1 ). Daily climate data and other climate summaries are available on the Minnesot a Climatology Working Group website at climate.umn.ed u. Table 1 . Monthly Averages, 1981 -2010 Mean Monthly Precipitation, 1981 -2010 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ANN Precipitation [in] 0.90 0.76 1.89 2.66 3.36 4.25 4.04 4.29 3.07 2.43 1.76 1.15 3 0.6 Mean Monthly Snowfall, 1981 -2010 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ANN Snowfall [in] 10.87 8.15 10.04 2.12 0.01 0.00 0.00 0.00 0.01 0.55 8.77 11.10 51.6 Mean Temperature, 1981 -2010 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec A NN Max o F 23.4 29.6 41.5 57.1 69.8 78.7 82.8 80.2 71.1 58.2 39.5 26.5 54.9 Min o F 7.5 12.7 24.2 37.2 48.9 58.7 64.0 61.7 52.2 39.7 26.2 12.7 37.2 Mean o F 15.6 20.8 32.7 47.4 59.1 68.7 73.7 71.1 62.0 48.8 33.7 20.1 46.2 Table 2 illustrates the probability of a rainfall event occurring in any given year within the City of Lino Lakes . The recurrence interval is a measure of the probability of occurrence of the storm event. For example, a rainfall event of 5.9 inches has a 1% probability of occurring in any given year which is expressed as once in every 100 years, the 3.6 inch rainfa ll event has a 20% probability of occurring in any given year which is expressed as once in every 5 years. These U.S. Precipitation Frequency Estimates for the Midwest are currently being updated by the National Oceanic and Atmospheric Administration (NOAA) and the National Weather Service (NWS). Once this study is complete, it is anticipated that the precipitation for the recurrence intervals illustrated in Table 2 will be modified. This project is expected to be complete d in 2013 . Updated informat ion on rainfall patterns and rainfall intensity may require modification of City ordinances and policies to ensure that development and redevelopment account for the changes in rainfall patterns and the resulting water management needs . Policies and ordin ances may also need modifications to ensure that affected natural resources are properly protected.