Updated: 2026-07-31
The closest measurement point to Glasgow with a complete historical record is the Met Office station at Aberfoyle (Perthshire-in-Central-Region), situated at 28 m elevation, roughly 35.6 km from the city centre. Its long-term series runs from 1 January 1968 to 1 October 2001. These are the numbers that station actually recorded — not a model estimate, not an interpolation for Glasgow, but ground-truth thermometer readings at that specific location.
Real frost conditions in Glasgow itself can differ meaningfully from Aberfoyle: the city sits on the River Clyde with urban heat-island effects, while Aberfoyle lies nearer the Trossachs hills at a different altitude. That said, the station's records are the best observational reference available, and they tell a clear story about how frigid this corner of Scotland can get.
-14.4 °C is the lowest temperature ever recorded at Aberfoyle, reached on 7 January 1970. That single morning remains the absolute cold record for the entire 1968–2001 series — a full five degrees below the next coldest reading on 8 January 1970, when the thermometer dropped to -12.2 °C.
Frost is defined here as any day when the minimum temperature falls below 0 °C. A "hard frost" is a day when the minimum drops below -3 °C — the threshold that typically kills tender crops and damages fruit blossom. The five most severe days in the entire Aberfoyle series with exact readings are:
| Date | Minimum temperature (°C) |
|---|---|
| 7 January 1970 | -14.4 |
| 8 January 1970 | -12.2 |
| 15 February 1973 | -12.0 |
| 17 February 1969 | -11.1 |
| 6 January 1970 | -11.1 |
Three of those five extreme mornings occurred within a single week in January 1970 — an extraordinary cold spell that has not been matched in the decades since. The repeated -11.1 °C readings on 6 January 1970 and 17 February 1969 show that the station's air frosts are not gentle dips: when the frost arrives, it can be severe and sustained.
The number of agricultural frost days per year varies enormously. The most frost-heavy year was 1969, with 110 frost days and a minimum temperature of -11.1 °C. The mildest years in the series, by contrast, recorded zero frost days — but those years (1987, 1988, 1989, 1990, 1991, 1992, 1993) have no minimum temperature data available in the MIDAS archive for this station, meaning the readings are missing rather than frost-free.
Here is the complete annual series for Aberfoyle, showing both the frost-day count and the coldest temperature of each year:
The chart shows the complete annual series. The table lists the most notable years; the full series comes from Met Office.
| Year | Frost days (min < 0 °C) | Coldest minimum (°C) |
|---|---|---|
| 1970 | 90 | -14.4 |
| 1974 | 56 | -7.5 |
| 1975 | 11 | -5.5 |
| 1978 | 10 | -5.0 |
| 1994 | 85 | -8.1 |
| 1997 | 52 | -6.4 |
| 2000 | 26 | -3.5 |
The gap in the archive between 1978 and 1987 is a data-coverage issue: no daily readings exist for those years at this station. The 1987–1993 entries with 0 frost days likewise reflect missing minimum-temperature measurements, not a frost-free climate.
Ranking the complete years by their coldest recorded temperature, the five harshest winters were:
| Rank | Year | Coldest minimum (°C) | Frost days |
|---|---|---|---|
| 1 | 1970 | -14.4 | 90 |
| 2 | 1973 | -12.0 | 85 |
| 3 | 1969 | -11.1 | 110 |
| 4 | 1995 | -10.9 | 84 |
| 5 | 1972 | -10.5 | 63 |
At the opposite end, the five mildest years — those where the thermometer never went far below freezing — were 2000 (-3.5 °C minimum, 26 frost days), 1978 (-5.0 °C, 10 frost days), 1975 (-5.5 °C, 11 frost days), 1997 (-6.4 °C, 52 frost days) and 1974 (-7.5 °C, 56 frost days). Notice that a mild winter minimum does not guarantee few frost days: 1997 saw more than half a hundred frost days despite never dipping below -6.4 °C.
The monthly pattern is what an orchardist or market gardener needs to plan around. Averaging all years from 1968 to 2001, here is the mean number of frost days and hard frost days for each month at Aberfoyle:
| Month | Mean frost days | Mean hard frost days (min < -3 °C) |
|---|---|---|
| January | 10.6 | 4.9 |
| February | 13.7 | 7.2 |
| March | 14.3 | 5.8 |
| April | 9.7 | 3.3 |
| May | 4.6 | 0.5 |
| June | 0.4 | 0.0 |
| July | 0.1 | 0.0 |
| August | — | — |
| September | 1.2 | 0.0 |
| October | 3.5 | 0.6 |
| November | 8.8 | 4.1 |
| December | 9.2 | 3.8 |
August is the only month with no recorded frost days at all in the series. The frost season effectively runs from September through May, but its heart is February, which averages 13.7 frost days — nearly half the month — and 7.2 hard frost days. March is statistically almost as severe, with 14.3 frost days, the highest monthly average of the whole year.
For horticulture, the most dangerous fact is that hard frosts (below -3 °C) persist into April, averaging 3.3 days that month, and even May sees 0.5 hard frost days on average. That means late frost damage to blossom is a genuine and recurring risk at this station well into spring.
If you are planning outdoor planting near Glasgow using Aberfoyle as your reference, the safe window for tender crops is narrow. June and July are essentially frost-free, with means of 0.4 and 0.1 frost days respectively, and no hard frosts at all in either month. But September already brings an average of 1.2 frost days, and October more than triples that with 3.5 days.
The interannual variability shown in the annual table is what makes planning hard: 1969 had 110 frost days, while 1978 had just 10 — a factor of eleven difference between the most and least frosty complete years. And the absolute record of -14.4 °C on 7 January 1970 remains decades old, a benchmark that helps explain why local growers still talk about the winter of 1970.
Source: Met Office MIDAS (Integrated Data Archive System), station at Aberfoyle, Perthshire-in-Central-Region, elevation 28 m. Period of record: 1 January 1968 to 1 October 2001. Data © Met Office, Open Government Licence (OGL v3.0), via CEDA.
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