Forum: Adelaide Chill Hours?

Adelaide chill hours?

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John starts with ... Hi, Anyone out there know where i can find the chilling hours for inner suburbs of Adelaide? Thinking of trying a low chill hours plum or cherry. Cheers John	About the Author John9 Adelaide 11th April 2010 11:10am #UserID: 517 Posts: 6 View All John9's Edible Fruit Trees
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BJ says... Hi John, There are loads of formula on the web; but if you're like me and into keeping it simply then this formula might work... (it is very rough as chill hours are not a linear thing - but it will put you in the ball-park) Chill hours = (-60 x coldest month average in degrees C) + 1400 To find the coldest month average I've found the BOM (bureau of meterology - http://www.bom.gov.au/) useful. Click on your state (top right hand corner in the lighter blue) then scroll down to 'climate information'. Then click on the state "climate averages". Select the monthly statistics for the location nearest to you and scroll down to observe the monthly average tempreatures. Highlighted in blue will be the coldest month. Using the above technique I'd estimate the chill hours in Adelaide to be around the 500 mark. Simularly I'd estimate ACT to be about 720, Hobart about 660, Melbourne around 620, Perth around 330, Sydney around 380 and Brisbane around 150. Darwin pretty much won't get any chill hours. Your exact location and microclimate you plant your trees in will alter the accuracy of these estimates. This is why I'm happy with a formula that is quite rough. It isn't an exact science!	About the Author BJ11 WA 11th April 2010 1:02pm #UserID: 3414 Posts: 215 View All BJ11's Edible Fruit Trees
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John says... thanks BJ - excellent help.	About the Author John9 Adelaide 13th April 2010 2:03pm #UserID: 517 Posts: 6 View All John9's Edible Fruit Trees
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Rhys says... That formula looks good; where did you find it?...I'd found that BOM data before but then not really known what to do with it in terms of chill hours, so thanks. Can I clarify, is it the average maximum temperature you use or the average minimum temp? Rhys	About the Author Getafix Newcastle 13th April 2010 5:56pm #UserID: 3112 Posts: 86 View All Getafix's Edible Fruit Trees
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BJ says... Hi Rhys, I've used the average maximum temp in the coldest month (so the top blue number on the BOM tables). This formula was one my Pop taught me when I was little. To be honest I'd not remembered the exact numbers so thought it was a good excuse to call him. (Just to show off here a bit ... he's an awsome bloke, a few years shy of 100, virtually self sufficient in his back yard and can still remeber this kind of stuff straight off!)	About the Author BJ11 WA 13th April 2010 8:31pm #UserID: 3414 Posts: 215 View All BJ11's Edible Fruit Trees
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John starts with ...
Hi,
Anyone out there know where i can find the chilling hours for inner suburbs of Adelaide?

Thinking of trying a low chill hours plum or cherry.

Cheers
John

About the Author
John9
Adelaide
11th April 2010 11:10am
#UserID: 517
Posts: 6

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BJ says...
Hi John,

There are loads of formula on the web; but if you're like me and into keeping it simply then this formula might work... (it is very rough as chill hours are not a linear thing - but it will put you in the ball-park)

Chill hours = (-60 x coldest month average in degrees C) + 1400

To find the coldest month average I've found the BOM (bureau of meterology - http://www.bom.gov.au/) useful. Click on your state (top right hand corner in the lighter blue) then scroll down to 'climate information'. Then click on the state "climate averages". Select the monthly statistics for the location nearest to you and scroll down to observe the monthly average tempreatures. Highlighted in blue will be the coldest month.

Using the above technique I'd estimate the chill hours in Adelaide to be around the 500 mark. Simularly I'd estimate ACT to be about 720, Hobart about 660, Melbourne around 620, Perth around 330, Sydney around 380 and Brisbane around 150. Darwin pretty much won't get any chill hours.

Your exact location and microclimate you plant your trees in will alter the accuracy of these estimates. This is why I'm happy with a formula that is quite rough. It isn't an exact science!

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BJ11
WA
11th April 2010 1:02pm
#UserID: 3414
Posts: 215

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John says...
thanks BJ - excellent help.

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John9
Adelaide
13th April 2010 2:03pm
#UserID: 517
Posts: 6

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Rhys says...
That formula looks good; where did you find it?...I'd found that BOM data before but then not really known what to do with it in terms of chill hours, so thanks.

Can I clarify, is it the average maximum temperature you use or the average minimum temp?
Rhys

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Getafix
Newcastle
13th April 2010 5:56pm
#UserID: 3112
Posts: 86

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BJ says...
Hi Rhys,
I've used the average maximum temp in the coldest month (so the top blue number on the BOM tables).
This formula was one my Pop taught me when I was little. To be honest I'd not remembered the exact numbers so thought it was a good excuse to call him. (Just to show off here a bit ... he's an awsome bloke, a few years shy of 100, virtually self sufficient in his back yard and can still remeber this kind of stuff straight off!)

About the Author
BJ11
WA
13th April 2010 8:31pm
#UserID: 3414
Posts: 215

View All BJ11's Edible Fruit Trees

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Adelaide chill hours?

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