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CoastalWx

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The dailies or monthlies?

Is it rounding error?

It's both. At first I thought it was a rounding issue, but that doesn't appear to be the case (unless they do it inconsistently). Since most NWS text products are auto-generated, I don't think it's due to manual entry or human error. An example of this is BDL on 9/24. BOX has the departure on the daily and monthly statements as -5 when it should be -6. Guess this is why they always denote the climate data is preliminary and not official on all their products.

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We haven't one of those since Jan 15th. The other four SNE sites haven't had one since June.

OT: would be nice if the NWS climate pages computed the departures correctly.

Yeah we got one yesterday thanks to radiational cooling dropping us to 34F then clouds and drizzle kept us from going higher than 51F. I have no idea when the last one was up here though at MVL...it's been a long time I think.

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We haven't one of those since Jan 15th. The other four SNE sites haven't had one since June.

OT: would be nice if the NWS climate pages computed the departures correctly.

Its been a warm year....i mean i dont think its nothing more or nothing less.....bdr did have below avg 2nd half of the month...i understand the consecutive streak...just saying it looks like the worm might finally be turning

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It's both. At first I thought it was a rounding issue, but that doesn't appear to be the case (unless they do it inconsistently). Since most NWS text products are auto-generated, I don't think it's due to manual entry or human error. An example of this is BDL on 9/24. BOX has the departure on the daily and monthly statements as -5 when it should be -6. Guess this is why they always denote the climate data is preliminary and not official on all their products.

I've seen times when it'll say the average mean temp for the day is 56F, the actual mean was 57F, but the departure is +2F...stuff like that. The departure not matching the difference between average and actual.

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Is a monthly departure from average calculated on climate forms by averaging the departures each day, or does it just take the average of the high/lows for the month and compare that to the month's climate normal mean temperature?

Not sure if that makes sense but I guess I'm asking if even the daily departures are off individually, could the monthly departure still be correct?

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I've seen times when it'll say the average mean temp for the day is 56F, the actual mean was 57F, but the departure is +2F...stuff like that. The departure not matching the difference between average and actual.

Yeah the cases I'm referring to appear to be wrong. Going back to my example, a high of 67 normal high of 72 low of 42 and normal low of 49 means a mean of 54.5 and a normal mean of 60.5. That's -6 no matter how you slice it or round it. BOX shows the mean as 55 (correctly rounding up), and the normal mean as 60 (rounded down?) for a departure of -5. NCDC has it as -6.

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above/below numbers for '09...

BDL 29/30

BDR 15/22

BOS 24/29

BTV 34/32

CAR 39/31

CON 26/35

EWR 25/23

JFK 19/25

LGA 19/25

NYC 21/29

ORH 31/36

PVD 25/24

PWM 26/26

Wow....was that a cold year....alot had to do with the chilly summer...but as i recall correctly jfm was cold also in 09.

Thank you for info...how do u find this stuff? Ur like yoda

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