The case of Trace for either Rain or Daily Snow

Occasionally the National Weather Service would report “Trace” or “T” in their Climate Report for a particular day. Here is a particular example of how this appears on the report.

In this instance the climatological report for St. Louis, MO indicated “Trace” or “T” for both Rainfall and Daily Snowfall, but there could be instances where only one is present.

In such case according to the contract rules of CX Futures Exchange L.P. applicable to www.TradeWeather.com the relevant index DARI (for rain) would equal to 0.01 and DASI (for snow) would equal to 0.1.

While the full text of the rules can be found here. here is extract of the applicable text:

Rainfall:

(b) Calculation and Quotation of the Index

(i) The Daily Aggregate Rainfall Index (“DARI”) represents the total rainfall
measured, typically in hundredths of inches, by specific measuring stations during each station’s
local calendar day (midnight to midnight, local time).

(ii) Each index point shall be quoted to the nearest one-hundredth of a point and each
point represents one inch of reported rainfall at the specified location (e.g. a KNYC index value
of 0.55 indicates that station KNYC has reported 0.55 inches of rainfall).

(iii) For the avoidance of doubt, any report of rainfall greater than 0.00” but less than
0.01”, including “trace” or similar reports of rainfall that are discernable although insufficient for
measurement will result in a DARI value of 0.01.

(iv) The DARI will be calculated by the Exchange relying primarily on data published
by the National Weather Service (“NWS”) in its Climate Report (“CLI”). Other weather products
reported by the NWS may be used as necessary to supplement or confirm data appearing in the
CLI. The Exchange makes no warranties with respect to the accuracy of the data published by
the NWS and the Exchange in its discretion may use other public and private weather reporting
sources to determine the value of the Daily Aggregate Rainfall Index when doing so is in the best

Daily Snowfall:

(b) Calculation and Quotation of the Index

(i) The Daily Aggregate Snowfall Index (“DASI”) represents the total snowfall
measured, typically in tenths of inches, by specific measuring stations during each station’s local
calendar day (midnight to midnight, local time).

(ii) Each index point shall be quoted to the nearest one-tenth of a point and each point
represents one inch of reported snowfall at the specified location (e.g. a KNYC index value of
5.5 indicates that station KNYC has reported 5.5 inches of snowfall).

(iii) For the avoidance of doubt, any report of snowfall greater than 0.0” but less than
0.1”, including “trace” or similar reports of snowfall that are discernable although insufficient for
measurement will result in a DASI value of 0.1.

(iv) The DASI will be calculated by the Exchange relying primarily on data published
by the National Weather Service (“NWS”) in its Climate Report (“CLI”). Other weather products
reported by the NWS may be used as necessary to supplement or confirm data appearing in the
CLI. The Exchange makes no warranties with respect to the accuracy of the data published by
the NWS and the Exchange in its discretion may use other public and private weather reporting
sources to determine the value of the Daily Aggregate Snowfall Index when doing so is in the
best interest of the marketplace.

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