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Maybe I didn't phrase the question correctly, but what I actually needed was the peak (hourly) usage in each month. And the way to do that is this:

        env_pd = sql_file.availableEnvPeriods[0]
        elec_ts = sql_file.timeSeries(env_pd, "Hourly", "Electricity:Facility")
        if elec_ts.length > 0
          elec_ts = elec_ts[0]
          year = elec_ts.firstReportDateTime.date.assumedBaseYear
          # Grab Jan time series and find the max
          elec_ts_Jan = elec_ts.values(OpenStudio::DateTime.new(OpenStudio::Date.new(OpenStudio::MonthOfYear.new("Jan"), 1, year), OpenStudio::Time.new(0,0)),
                                       OpenStudio::DateTime.new(OpenStudio::Date.new(OpenStudio::MonthOfYear.new("Jan"), 31, year), OpenStudio::Time.new(0,23)))
          for i in 0 .. elec_ts_Jan.length-1 do
            if elec_ts_Jan[i] > peak_electricity_Jan
              peak_electricity_Jan = elec_ts_Jan[i]
            end
          end 
          # Repeat for other months