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Lino Lakes Local Water Management Plan 9 November 2018 – WSB Project No. 02988-500 2. PHYSICAL ENVIRONMENT AND RESOURCE ASSESSMENT 2.1 Climate and Precipitation The climate within the Minneapolis-St. Paul Metropolitan area is described as a humid continental climate with moderate precipitation, wide daily temperature variations, warm humid summers, and cold winters. The total average annual precipitation in this area from 1981 to 2010 (the most recent year the data was available) is approximately 30.81 inches, of which approximately 40% occurs in the months of June, July and August (MnDNR 2017). The annual snowfall is about 37.3 inches (MRCC 2017) and is roughly equivalent to 2.9 inches of water. Additional climatological information for the area may be obtained from the Minnesota State Climatology Office. Table 2-1. 1981-2010 Climatic Data for Lino Lakes, MN 1981-2010 Monthly Normal Precipitation - Lino Lakes, MN Annual Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 30.81 0.86 0.76 1.74 2.68 3.57 4.32 4.02 4 3.33 2.69 1.7 1.14 1891-2017 Monthly Precipitation – Lino Lakes, MN Annual Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 28.96 0.83 0.83 1.53 2.36 3.63 4.45 3.71 3.70 3.16 2.31 1.48 0.99 1972-2014 Monthly Pan Evaporation – University of Minnesota, St. Paul Annual Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 36.83 - - - 1.85 6.72 7.50 8.06 6.67 4.75 1.26 - - 1981-2010 Monthly Normal Snowfall - Vadnais Lake NCDC Station Annual Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 37.9 9.5 5.7 7.6 0.9 0 0 0 0 0 0.3 5.4 8.5 1981-2010 Monthly Normal Temperature – Vadnais Lake NCDC Station Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Max 25.8 31 42.8 58.4 71 80 84.6 82 72.9 59.3 42.3 28.7 Min 7.1 11.6 23.7 37.6 50 59.4 64.1 61.8 52.8 40.8 27 12.8 Mean 16.5 21.3 33.3 48 60.5 69.7 74.4 71.9 62.9 50.1 34.7 20.7 Precipitation is often defined in terms of recurrence intervals, or the probability of a certain rainfall occurring during a given year. For example, a rainfall event of 6.13 inches has a 2% probability of occurring in any given year, which is also expressed as once in every 50 years, the 9.81 rainfall event has a probability of 0.2% and is expressed as once every 500 years. The following table presents the probability of typical design rainfall events within the City of Lino Lakes, including the 100-year 10-day snowmelt event. Table 2-2. NOAA Atlas 14 Design Storm Events (Sanja et al 2013). Recurrence Interval [years] 1 2 5 10 25 50 100 100 200 500 1,000 Probability 100% 50% 20% 10% 4% 2% 1% 1% 0.5% 0.2% 0.1% Duration 24-hour 24-hour 24-hour 24-hour 24-hour 24-hour 24-hour 10-day 24-hour 24-hour 24-hour Rainfall Amount [in] 2.43 2.80 3.50 4.17 5.22 6.13 7.12 9.86 8.22 9.81 11.10