Get the data out of the sql file using something like this:

# Get the weather file run period (as opposed to design day run period)
ann_env_pd = nil
sql.availableEnvPeriods.each do |env_pd|
  env_type = sql.environmentType(env_pd)
  if env_type.is_initialized
    if env_type.get == OpenStudio::EnvironmentType.new("WeatherRunPeriod")
      ann_env_pd = env_pd
    end
  end
end

# Only try to get the annual peak demand if an annual simulation was run
exit if ann_env_pd.empty?

# Get the timeseries data
elec = sql.timeSeries(ann_env_pd, "Monthly", "Electricity:Facility", "")
if elec.is_initialized
    elec = elec.get            
    elec.values.each do |val|
      # There should be 12 monthly values
    end
end