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a cold day in July

A time or event that seems unlikely or will never come to pass. It refers to the fact that the weather is usually very hot in July. It'll be a cold day in July before they get that new interstate built.
See also: cold, July

it'll be a frosty Friday

It is unlikely or impossible (that something will ever occur). Sometimes followed by "in Hell," or "in July" or other hot places or times to add more emphasis. It'll be a frosty Friday when I sign over the lease of my land to you. It will be a frosty Friday in July before the two parties agree to anything.
See also: Friday, frosty

*knee-high by the 4th of July

Fig. grown as tall as it should. (Corn seedlings are proverbially supposed to be as high as someone's knee by July 4th.) (*Typically: be ~; become ~; grow ~.) What with this drought, I don't think the crop will be knee-high by the 4th of July. It's gonna be a good year. Knee-high by the 4th of July.
See also: 4th, by, July, of

it'll be a frosty Friday (in July)

used to indicate that something is very unlikely to happen. Canadian informal
1990 Walter Stewart Right Church, Wrong Pew It would be a frosty Friday in the middle of July before he would discuss personal affairs with the press.
See also: Friday, frosty
References in periodicals archive ?
There are no calling hours; funeral service 12-Noon Tuesday, July 21, 2009, Graveside service in Woodlawn Cemetery.
Basel Childbirth Trust July 1, 8, 15, 22 & 29: Bumps and Babes meet-up, 11:00-13:00 July 2, 9, 16, 23 & 30: Bumps & Bruises meet-up, 11:00-13:30 July 2: Dad's Night Out July 3, 10, 17, 24 & 31 : Beyond Bruises meet-up, 15:30-17:00 July 25: Summer Festival July 31 : Mum's Night Out www.
July 16-19: Conference: National Organization of Forensic Social Work; Chicago; www.
July 29-July 31, 2005 Long Plain First Nation, Man.
CPE Credits: 17 (main) and up to 4 (optional) Pre-Conference Workshops: Sunday, July 17
JULY 17-20: National Pork Conference, Lake of the Ozarks, Mo.
July 17: Radcliffe Borough (a), 3pm; July 24: Bradford City (a) 3pm; July 27: Oldham Athletic (a) 7.
Near Asheville Boy's Rites of Passage : July 10-16, ages 13-17.
patent: 6,087,519 Issued: July 11, 2000 Inventors: Francis Garnier, Philippe Lang, Richard Michalitsch, Gerhard E.
National Optometric Association will meet July 17-22 in Indianapolis, 877-394-2020.
The July slowdown for commercial building may be an initial sign that this sector too will experience some loss of momentum during the coming months.
To determine the cause of a July 1996 outbreak of Escherichia coli O157:H7 among factory workers in Kyoto, Japan, we conducted cohort and case-control studies.
By unanimous vote, the minutes of the meeting of the Federal Open Market Committee held on July 5-6, 1995, were approved.