Blocking issues

[ChrisMarsh82]

@chrismclarke needs to be able to build the app to do this we need to have good test data and bring back data in a consistent manner.

I believe these are all the current blocking issues

• annual_rainfall_summaries issues #94
• annual_temperature_summaries issues #96
• crop_success_probabilities issues #97
• monthly_temperature_summaries issues #98
• season_start_probabilities issues #99
• extremes_summaries issues #100

[ChrisMarsh82]

I've added a couple of more issues:

• issue with season_start_probabilities #112
• issue with extremes_summaries #111

@lilyclements