Now that would be spooky. I believe snow can fall on the very highest tops of the Scottish mountains in any month, but I've certainly never heard of low-level snow in either July or August. It's the height of summer, after all (or should be!).

I'm sure it will shock you to know that I have looked into this.

To answer the question; No. On low ground snow has never been recorded in either July or August. 

On high ground I believe snow has been recorded at every time in the year (mostly above 1050m) except the last week of July where it is too warm for snow even to fall on the scottish and welsh summits. 

As far as lying snow goes, there are several spots in Scotland where it almost never melts notably the sphinx which is a sheltered slope at about 1000m where snow survives to the next winter.  

The closest I got to finding snow in july was 12th 1888, where it was unusually cold with temperatures dropping to 3C or 4C during the early hours with heavy showers. There were snow reports but they are generally regarded as being mistaken by hail.

The more interesting one is September snow, which I do actually believe to be possible but it just has a ridiculous rarity. Even October snow is more unusual than May snow. Snow can also fall at lower levels during June, though it has only ever done so in the first week I believe.

We've had snow showers over the last couple of days but nothing settling until today. However that's all changed after a really heavy shower went through that's left about an inch everywhere. Very pretty. The flaked during the heaviest part were extremely large - I measured one at just under 3 inches!! Exciting to watch

Heavy rain has recently turned to a mix of sleet and wet snow, even a thin covering on car roofs, despite a temp of 6.5C !

Not even had a spot of rain here today ..... feels colder though.  More like March than April.

Another air frost this morning too

Frequent sleety snow showers in south Manchester so far this evening.

Even settling on a few prone surfaces (albeit very temporarily).

with snow showers yesterday too this is becoming quite an unusual spell. 

I think once temperatures does actually eventually recover to normal values (around 12 C to 15 C and higher dewpoints) under the "default" tropical maritime airflow, which is expected to do so as we go into next week at least for the southern half of the UK, it's going to suddenly feel positively balmy for it when compared to the past few days! (Especially at night time and first thing in the morning). 

It is quite odd that it's nearly May! I've got a close eye on the showers tomorrow night after the front moves through. I've moved out to Saddleworth so finally I've got a bit of elevation on my side! (200m) 

Braemar Friday.  Now that is

 http://www.metoffice.gov.uk/public/weather/forecast/gfjs69wkh#?fcTime=1461888000

I've just watched Jay Winne on the Beeb show the snow firstly staying North of the Central Belt (7.40pm local forecast) and then at 8.40pm say we are worried about the East Central Scotland, but the snow could be further North/South.  Fair to say it could be anywhere.

Thanks, Kev. :)

Here in Exeter it was 12c before it clouded over and some Cb's produced rain with soft hail and sleet mixed in. crazy! Temp dropped to single figures but still was most unexpected. It felt warm and then suddenly 1230pm -1pm sun went in and the wintry shower came along.

I expect April showers but it's May soon and didn't expect to see such prolonged and widespread snow/wintry showers for so long.

Why is the precipitation so wintry? Is it colder air aloft?

Cetainly a notable spell due to how late in April it is. Max of only 5.2c yesterday with frequent snow showers with some areas having a local covering even during the middle of the day.

This morning it's clear and -1.4c. As I look out of the window there is a clear wedge of winter wonderland postcard scenes glistening in the morning light in roughly the area between Leeds and Bradford with areas nearer and farther beyond not seeing anything settling  Pictures I have seen suggest 2cm in this area. 
Tonight looks very interesting. Met office has temp between 0c and 1c all night with heavy snow showers.