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Old 10-22-2012, 08:12 PM
 
Location: Wellington and North of South
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In this context I mean all 12 3-month "seasons" are considered, and the ratio of the driest one to the wettest one is calculated. The most even distribution of monthly averages that I can find for my country for a station with a long record gives a ratio of over 91% - the monthly means (shown rounded) in mm are:

62 59 61 61 65 59 64 60 54 60 62 67 (734 annual).

[This of course does not necessarily imply that rainfall values for any given month have a low variability year to year at this location - the standard deviations of the individual monthly series range from 55% to 78% of their corresponding means].

I'm wondering if there's somewhere where this could be exceeded for "evenness". Note that the above calculation would be rather meaningless for a hyperdesert type of climate where all monthly means are very small.
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Old 10-22-2012, 09:25 PM
B87
 
Location: Surrey/London
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London

J: 55.2
F: 40.9
M: 41.6
A: 43.7
M: 49.4
J: 45.0
J: 44.5
A: 49.5
S: 49.1
O: 68.5
N: 59.0
D: 55.1

Spring: 134.7
Summer: 139.0
Autumn: 176.6
Winter: 151.2
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Old 10-22-2012, 09:34 PM
 
Location: Wellington and North of South
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Quote:
Originally Posted by B87 View Post
London

J: 55.2
F: 40.9
M: 41.6
A: 43.7
M: 49.4
J: 45.0
J: 44.5
A: 49.5
S: 49.1
O: 68.5
N: 59.0
D: 55.1

Spring: 134.7
Summer: 139.0
Autumn: 176.6
Winter: 151.2
So your driest period is FMA (126.2mm) and wettest OND (182.6mm), giving a ratio of 69% (D/W). That's about mid-table in my list of stations.
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Old 10-22-2012, 11:02 PM
 
Location: New York City
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NYC is about 80%. 10.74 inches for JDF and 13.45 for JJA. But February will often seem more dry than it really is simply because it has fewer number of days.
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Old 10-22-2012, 11:35 PM
 
Location: Wellington and North of South
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Quote:
Originally Posted by MrMarbles View Post
NYC is about 80%. 10.74 inches for JDF and 13.45 for JJA. But February will often seem more dry than it really is simply because it has fewer number of days.
Are you using all 3-month seasons in that calculation? - it's just that I found one graph of Central Park rain means that gives September as wetter than June - but that was for the whole record, and the latest 30-year mean could of course differ from that.
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Old 10-22-2012, 11:56 PM
 
Location: New York City
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I just used Wikipedia stats. I'm lazy.
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Old 10-23-2012, 04:44 PM
nei nei won $500 in our forum's Most Engaging Poster Contest - Thirteenth Edition (Jan-Feb 2015). 

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Location: NYC
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Quote:
Originally Posted by RWood View Post
Are you using all 3-month seasons in that calculation? - it's just that I found one graph of Central Park rain means that gives September as wetter than June - but that was for the whole record, and the latest 30-year mean could of course differ from that.
I got 87% for Setauket, Long Island about 55 miles east of Central Park NYC.

Precipitation (mm) Jan-Dec:

90 91 96 104 101 97 97 96 96 92 95 94

3 month averages, so each number is the average of the month and the months adjacent to it.
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Old 10-23-2012, 04:56 PM
 
Location: Wellington and North of South
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Quote:
Originally Posted by nei View Post
I got 87% for Setauket, Long Island about 55 miles east of Central Park NYC.

Precipitation (mm) Jan-Dec:

90 91 96 104 101 97 97 96 96 92 95 94

3 month averages, so each number is the average of the month and the months adjacent to it.
That's a very good one. It interests me that there areas where in the long term the various factors influencing rainfall more or less cancel out in this particular respect, given the variations in weather regimes over the seasons. The NZ case I cited is for Ashburton in the central Canterbury plains. The province as a whole however has a number of markedly differing rainfall regimes, with all seasons figuring both as driest and wettest somewhere, and the ratios varying from about 40% to over 90%.
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Old 10-23-2012, 05:00 PM
nei nei won $500 in our forum's Most Engaging Poster Contest - Thirteenth Edition (Jan-Feb 2015). 

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Location: NYC
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Quote:
Originally Posted by RWood View Post
That's a very good one. It interests me that there areas where in the long term the various factors influencing rainfall more or less cancel out in this particular respect, given the variations in weather regimes over the seasons.
It's actually very similar to my hometown. If you go north or more coastal, a slight summer precipitation minimum occurs, due to less convective activity. Inland, a winter minimum starts to appear due to less available moisture for winter precipitation. There isn't a strong seasonality in precipitation anywhere in the region, though. I assumed growing up that no seasonality was natural.
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Old 01-09-2014, 06:03 PM
 
Location: Sydney, Australia
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Parkes, NSW

https://en.wikipedia.org/wiki/Parkes..._Wales#Climate

Very even.
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