What is exactly "precip_ratem"?

  • 1
  • Question
  • Updated 5 years ago
Hi,

I see precip_ratem and precip_ratei in the response of an API history request. I assume that m is for metric and i is for imperial.
However what is exactly this measure?
I was thinking that it was the amount of rain (in mm or inch) which fall during the last period of time (compare to precip_total which is a sum) but with the following example, it seems not right.
Indeed we have a "precip_ratem":"200.4" when "precip_totalm" only increase 12.2 mm during the 10 minutes interval.

Example :

Day 2012/07/05 for IAUDENAR2 :

{
"date": {
"pretty": "3:20 PM CEST on July 05, 2012",
"year": "2012",
"mon": "07",
"mday": "05",
"hour": "15",
"min": "20",
"tzname": "Europe/Paris"
},
"utcdate": {
"pretty": "1:20 PM GMT on July 05, 2012",
"year": "2012",
"mon": "07",
"mday": "05",
"hour": "13",
"min": "20",
"tzname": "UTC"
},
"tempm":"19.8", "tempi":"67.6","dewptm":"17.6", "dewpti":"63.6","hum":"87","wspdm":"8.0", "wspdi":"5.0","wgustm":"16.1", "wgusti":"10.0","wdird":"221","wdire":"SW","pressurem":"1010.4", "pressurei":"29.84","windchillm":"-999", "windchilli":"-999","heatindexm":"-9999", "heatindexi":"-9999","precip_ratem":"6.6", "precip_ratei":"0.26","precip_totalm":"8.1", "precip_totali":"0.32","solarradiation":"14","UV":"0.0","softwaretype":"Wunderground v.1.15" },
{
"date": {
"pretty": "3:30 PM CEST on July 05, 2012",
"year": "2012",
"mon": "07",
"mday": "05",
"hour": "15",
"min": "30",
"tzname": "Europe/Paris"
},
"utcdate": {
"pretty": "1:30 PM GMT on July 05, 2012",
"year": "2012",
"mon": "07",
"mday": "05",
"hour": "13",
"min": "30",
"tzname": "UTC"
},
"tempm":"19.7", "tempi":"67.4","dewptm":"18.2", "dewpti":"64.7","hum":"91","wspdm":"9.7", "wspdi":"6.0","wgustm":"9.7", "wgusti":"6.0","wdird":"229","wdire":"SW","pressurem":"1010.4", "pressurei":"29.84","windchillm":"-999", "windchilli":"-999","heatindexm":"-9999", "heatindexi":"-9999","precip_ratem":"200.4", "precip_ratei":"7.89","precip_totalm":"20.3", "precip_totali":"0.80","solarradiation":"23","UV":"0.0","softwaretype":"Wunderground v.1.15" },

Thanks for your help!
Photo of fruition

fruition

  • 6 Posts
  • 0 Reply Likes

Posted 6 years ago

  • 1
Photo of John Celenza

John Celenza, Official Rep

  • 40 Posts
  • 21 Reply Likes
Hello,

precip_ratem and precip_ratei are rainfall rates in mm per hour or inches per hour, respectively.

It indicates how hard rain is falling.

Most software vendors send this data to us as an instantaneous rate (even with the hour in the denominator). While others compute it as literally the amount of rainfall in the past 60 minutes (with that 60 minutes being a sliding window).

I hope this helps!

-John
Photo of fruition

fruition

  • 6 Posts
  • 0 Reply Likes
Thanks for this answer.
So what is exactly precip_totalm?
What is exactly precipm?

Why precipm is not available in my json response?

Thanks