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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

born on the Fourth of July

Said of an extremely patriotic American. (July 4 is Independence Day in the US.) I don't know anyone as passionate about being American as my grandfather. He's always acted like he was born on the Fourth of July.
See also: born, fourth, July, of, on

Happy (Holiday Name)!

A standard greeting and phrase of celebration on a particular holiday. Happy Fourth of July, everyone! A: "Good morning, my love. Happy Valentine's Day!" B: "Aw, thank you, you're so sweet. Happy Valentine's, sweetie." Three… two… one… Happy New Year's!
See also: happy

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

the July effect

rude slang The supposed rise in medical mistakes that occurs at the same time as newly-qualified doctors begin to treat patients. Primarily heard in US. I'm doubly worried about my dad. Not only does he have to have emergency surgery, but he also might fall victim to the July effect, as he's being treated by some doctor who's younger than I am!
See also: effect, July
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

*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
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

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
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
GROUP C Saturday July 13 - Arbroath v Elgin, Stirling v Hibernian.
Dina-I, 20 July R.A.Bazar, 23 July Gunjmandi, 24 July Bewal, 25
Wednesday, July 4, on Illinois Boulevard, proceeding northeast from Paris Lane to Evanston Street.
The PTI chief will visit Rawalpindi on July 13 while he will address rallies in Peshawar and Mardan on July 14.
Monday, July 20, 2009, at the funeral home; funeral service 10 a.m.
American Women's Club Zurich July 8: Casual Lunch Bunch, 12:00 July 15: SummerThai Cooking Class at the clubhouse, register by July 10; cost is SFr 75 for members, SFr 90 for guests Info: www.awczurich.org
July 12-14: International Conference: Computers; Helping People with Special Needs; Linz, Austria; www.icchp.org
July 23-July 24, 2005 Whitefish Lake First Nation, Ont (705) 692-1954
CPE Credits: 16 (main) and up to 4 (optional) Pre-conference Workshops: Sunday, July 10
JULY 17-20: National Pork Conference, Lake of the Ozarks, Mo.
German tour - July 16: SC Schorndorf; July 20: mini four-team tournament in Reutlingen (local sides); July 23: possible tournament final; July 28: Stockport County (a) 7.45pm; July 31: Preston North End (a) 3pm.
Weaverville, NC 4th of July Weekend Retreat : 7/2-7/5 All-inclusive: $527 for one or $757 for two.
Christmas in July and one of the largest parades on the North Shore.
patent: 6,086,811 Issued: July 11, 2000 Inventor: Louis T.
* National Association for the Advancement of Colored People (NAACP) will hold its annual convention July 7-12 in New Orleans.