Rainfall patterns

Martin Mikulcik

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This is something I've been thinking about recently. When you are trying to grow something you don't know how to grow, you look at where it originated.
You can compare pH, extreme temperature, average temperature, length of growing season, and rainfall patterns and you end up with something pretty similar to the köppen map

Koppen-Geiger_Map_v2_World_1991–2020.svg.png


Now for me, in the last five years we've gotten as low as -13F and as high as 104F. We've had years with 30ish inches of rain and years with 60. Last July/August was the driest since 1960 with 2.25in. That's why i didn't get any late butternut squash.

Native plants are built to withstand these conditions. You can tell it was a bad year when you see a few old oaks die. They've lived a hundred years and this was the breaking point.

And so as gardeners we modify our climate if we want to grow things from dissimilar climates. Irrigation, soil amendments, greenhouses.

A lot of times we don't know really what we're striving for and so we respond to the plant's symptoms and learn from trial and error.

There's no such thing as a weak plant, it's tough as nails in the right environment, but some are more widely adapted than others

Now what I was realizing was that my rainfall pattern is opposite to europe's

Screenshot_20260127-205233_Chrome~2.png


You'll see Murray, Ky (and Missouri to a lesser extent), has an extremely wet spring that decreases as the season progresses. Rome follows the same pattern (which could explain why Italian varieties do pretty well actually)

The rest of Europe north of Italy gets wetter as the season progresses. And I've seen on certain plants where they won't root in the ground deep enough because there's plenty of spring water, then they dry up in the summer, because their roots are small.

So then i turned to Mexico down to South America and noticed another trend
Screenshot_20260127-210716_Chrome~2.png

It's a wet season/dry season climate, and this holds true all the way down to peru and up to el paso.

To demonstrate my ignorance, I have this association with Mexico as dry, because the sonora desert borders the usa. And for much of the year even the southern parts see little rain

Screenshot_20260202-194441_Maps~2.png

This picture is just 20 miles from Mexico City, and you can see how it greens right up once the rains come.

And so a part of the world that's very dry and grows agaves and cacti can also grow monsoon plants that need even more water than I naturally get in my humid continental climate
 

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Meadowlark

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Interesting. You have a lot of info there.

For years (decades), the rainfall pattern here was almost invariant...i.e. lot of rainfall in winter and early spring, followed by relatively dry late March through April and mid May and generally large rainfall amounts accompanying stalled out cold fronts the last two weeks of May.

Potato and onion harvests were often very dicy due to heavy late May rainfall. That was followed by relatively dry weather until a hurricane and/or early cold fronts arrived in the fall to start the rainfall cycle again which continued through winter.

Ponds fill up in winter and drop in summer. Things have gone whacky the last two years. No appreciable rainfall this winter and last. No stalled out fronts dropping 30 inches in three days.

I never water the garden in winter...except the last two winters which have been very dry.

I wonder if it is an aberration or has the local pattern actually changed? Time will tell.

The only certainty, as they say, is death and taxes.
 

big rockpile

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We really haven’t had any rain last couple years I’m watering stuff just so it will rot down.

I’m going to try Ruth Stout method. Got bunch of mulch on the garden. I watered it a couple times.

big rockpile
 

Oliver Buckle

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Wish we had a pattern, England is an off shore island with the prevailing winds coming from the south west, across the Atlantic. Otherwise they are from the East, Siberia, or the North , Arctica.
My Dad used to say "Other countries have climates, we have weather."
 
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Meadowlark

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... it's rare to have two days the same.
Interesting how different things can be.

Here our weather forecaster can post virtually the same forecast every day starting in June and continuing through early September. In fact, they often joke about doing just that. Generally, only a hurricane changes the forecast in that period.

The patterns change much more quickly other months here, but we still have relatively long stretches of a given pattern. Right now, we are in a 14-day forecasted pattern of very light winds, bright sunshine, and high of 75 deg F and lows of 50 deg F. Very nice gardening weather. 🤠
 

cpp gardener

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The difference lies with the size of the landmass. Our big landmass leads to more stable weather patterns, while Great Britain’s landmass is relatively small, leading to less land influence on the weather. It’s just there are pesky landmasses nearby that insist on influencing the weather on the British Isles and a big ocean that keeps you, slightly, warmer while throwing random storms at you.
You do have a climate, Temperate Maritime, featuring cold to very cold wet winters with (comparatively) warmer, also wettish, summers. There is a cline from North to South of warmer temps and lower rainfall. The fact that you can’t get particularly far from the ocean means that it will have a big influence on the weather. Throw in mountains and plains and you have a recipe for wide fluctuations in daily weather. Enjoy!
 

DirtMechanic

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Interesting article on changing rainfall patterns...

Here is a rainfall article that will give you nightmares.

 

Oliver Buckle

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There is a big high stuck over the continent, and lows keep coming in off the Atlantic and getting stuck against it over us, rain ,rain, and more rain. We are near the top of a hill, but my lawn still squelches when I walk over it to the bird feeder, can't do a thing In the garden.
 

Martin Mikulcik

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There is a big high stuck over the continent, and lows keep coming in off the Atlantic and getting stuck against it over us, rain ,rain, and more rain. We are near the top of a hill, but my lawn still squelches when I walk over it to the bird feeder, can't do a thing In the garden.
It's been a dry winter for us, so if you could, send a little our way
 

Sheal

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Our big landmass leads to more stable weather patterns, while Great Britain’s landmass is relatively small,

Thank you @cpp gardener for calling our country Great Britain (although the 'Great' is slipping a bit) and not the UK. :) I have an aversion to people who call countries by their title and not the country's name.
 

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