Greenhouse temp`

[KMARKSnr]

Hi all,
        The weather at present is through the roof as to what its doing here in Lancashire.
        My thermometers read 40 f the other morning,and this morning read 66 f at 8-35am inside my greenhouse,all doors shut  ;D

                       Regards,
                              Mark.

[KMARKSnr]

[caroline7758]

I'm never sure about how things cope with fluctuations in temp. in greenhouses. Mine is "unheated" and wrapped in bubblewrap so mostly frost-free, but when the sum comes out it gets really warm. Will my potatoes and seedlings (started off in the kitchen) be ok?

[derbex]

Spud will probably be OK -I'm assuming they're planted up in containers? Seedlings -depends what they are. I wouldn't put Toms. Aubs, Peppers &c. in mine at the moment. Leeks, lettuce and cabbage are happy though.

[weedin project]

I've got 2 mimimax thermometers in my totally unprotected greenhouse - one laying on the soil bed, the other inside a double-size unheated propagator.  They have both dropped down to -10^oc this winter, but recently haven't been below -2.  In the past fortnight they've both stayed above freezing (but only just).

I was keeping one of them inside a propagator inside mini-greenhouse inside the greenhouse for a while, and even in there it still went down to -5 some nights this year. 

The minimum bit is a bit of a problem - but the maximum doesn't help much either at times - the thermometers only read up to +50, and sometimes on sunny days it has been close to that too.  In February I have had variation between -10 and +40 over a 24 hour period, which can't do many seeds/seedlings much good! 
I think next year I'll bubble-wrap (like I did last year) and put in a heater as well.  The only good news is that the greenhouse is probably absolutely clear of pests now!

[caroline7758]

No, my souds are in egg boxes chitting. I covered them with a layer of bubble wrap when I thought it might go below freezing. How will I tell if thry've been caught by frost?

[amphibian]

I've got 2 mimimax thermometers in my totally unprotected greenhouse - one laying on the soil bed, the other inside a double-size unheated propagator.  They have both dropped down to -10^oc this winter, but recently haven't been below -2.  In the past fortnight they've both stayed above freezing (but only just).

I was keeping one of them inside a propagator inside mini-greenhouse inside the greenhouse for a while, and even in there it still went down to -5 some nights this year. 

The minimum bit is a bit of a problem - but the maximum doesn't help much either at times - the thermometers only read up to +50, and sometimes on sunny days it has been close to that too.  In February I have had variation between -10 and +40 over a 24 hour period, which can't do many seeds/seedlings much good! 
I think next year I'll bubble-wrap (like I did last year) and put in a heater as well.  The only good news is that the greenhouse is probably absolutely clear of pests now!

Shade readings in my house have varied this winter between -4.6°C and 37.2°C.

In my propagator I had a disaster when I left the vents closed and the heat on, and the sun came out blazing, the temperature in my propagator reached 63.2°C, while my plants recovered the ungerminated seeds never germinated.

What we do have in this country is very intense sunlight, I have lived in many places around the world and have always found the sun on a clear day in Britain to be the brightest.