Author Topic: 147 years of rain data to play with, and some interesting graphs  (Read 369 times)

0 Members and 1 Guest are viewing this topic.

Offline SLOweather

  • Administrator
  • Forecaster
  • *****
  • Posts: 3227
    • http://www.sloweather.com
Up for discussion, I located 147 years of precipitation data from the local university.

Here is the raw data, in inches.



Here is a 10 year moving average and moving median:



Here is the 30 year moving average/median:



Any thoughts? Any conclusions?
« Last Edit: April 17, 2017, 03:54:18 PM by SLOweather »

Offline Bushman

  • Forecaster
  • *****
  • Posts: 6582
    • Eagle Bay Weather
Re: 147 years of rain data to play with, and some interesting graphs
« Reply #1 on: April 17, 2017, 04:20:01 PM »
Without run stochastics, the only observation I would make is that the data appears to suggest more oscillation  year-over-year indicating unstable systems at work.

Offline Jáchym

  • Meteotemplate Developer
  • Forecaster
  • *****
  • Posts: 8481
    • Meteotemplate
Re: 147 years of rain data to play with, and some interesting graphs
« Reply #2 on: April 17, 2017, 05:35:21 PM »
As I already told Chris, my interpretation is that the median is more or less the same, but the average is now higher. This means that the "middle" value is still the same, there are still years with same or lower than average sums, but there are more frequent values that are very high and bring the average up.

Offline SLOweather

  • Administrator
  • Forecaster
  • *****
  • Posts: 3227
    • http://www.sloweather.com
Re: 147 years of rain data to play with, and some interesting graphs
« Reply #3 on: April 17, 2017, 06:02:32 PM »
Attached is the spreadsheet if anyone wants to play with the data.

Offline Jáchym

  • Meteotemplate Developer
  • Forecaster
  • *****
  • Posts: 8481
    • Meteotemplate
Re: 147 years of rain data to play with, and some interesting graphs
« Reply #4 on: April 17, 2017, 06:08:43 PM »
Yeah

Here is just a very simple example what can lead to increase in avg, but same median:

Original data:
100, 100, 150, 120, 150

New data:
100, 100, 250, 120, 230

Same median, higher avg