Updated: 2026-07-31
Glasgow does not have its own long-term weather station in the Met Office MIDAS archive, so the nearest reliable point of measurement is Aberfoyle, in Perthshire-in-Central-Region, 35.6 km from the city centre and 28 m above sea level. These are the official records from that station — the closest historical reference we have for Glasgow's frost season. The city's own climate may differ due to local factors like its position on the River Clyde, urban heat, and shelter, but Aberfoyle is the best measuring point available in the official archive.
110 frost days in a single year — 1969
That is the standout figure in the Aberfoyle record between 1968 and 2001. The year 1969 was exceptional: 110 separate days with a minimum temperature below 0°C. It remains the most frost-heavy year in the period covered by this station's data, and it has not been beaten in the years since.
Frost days matter for gardeners, for transport planners, for energy demand — and for anyone who has woken up to a white windscreen and wondered if this was a normal Scottish winter. At Aberfoyle, the answer varies enormously from year to year. In 1975, the station recorded just 11 frost days in the entire year. In 1978, even fewer: 10. The gap between 110 and 10 is the difference between a winter that never lets go and one that barely bites.
Look at the run from 1968 to 1974: 97, 110, 90, 69, 63, 85, 56 frost days. That sequence tells you what a typical cold year looked like — consistently above 50 frost days, sometimes well above. But then 1975 arrives with 11, and the character of the record changes. The coldest winters of the late 1960s and early 1970s, which produced those high counts, were followed by a milder stretch. Later years in the series — 1997 with 52, 1998 with 45, 2000 with 26 — show a pattern of lower totals, though 1994 and 1995 both returned to 85 and 84 frost days respectively.
The mean annual minimum temperature at Aberfoyle tracks these frost counts closely. In 1975, when frost days collapsed to 11, the annual mean minimum temperature was 1.0°C. In 2000, with 26 frost days, it was 6.0°C — the mildest year for minimum temperatures in the series. The coldest years for mean minimum temperature were 1969 and 1978, at 3.3°C and 1.4°C respectively, the two most frost-heavy years on record.
What does this mean in everyday terms? In a year like 1969, with 110 frost days, the ground would typically be frozen from late autumn through early spring. In a year like 1978, with 10 frost days, frost would be a rare event, possibly confined to a few sharp nights in deep winter. The difference is not merely statistical; it is the difference between a season where you need to protect plants and pipes for weeks on end, and one where you rarely think about it.
The full annual series for Aberfoyle runs from 1 January 1968 to 1 October 2001, with gaps. The table below shows every year with complete frost-day counts and the corresponding annual mean minimum temperature. The gaps — 1976, 1977, 1979 through 1993, and 1999 — are simply years where the station's daily data is not complete enough to calculate reliable annual totals.
The chart shows the complete annual series. The table lists all years with complete data; the full series comes from Met Office.
| Year | Frost Days (Min < 0°C) | Annual Mean Min Temp (°C) |
|---|---|---|
| 1968 | 97 | 3.6 |
| 1969 | 110 | 3.3 |
| 1970 | 90 | 3.7 |
| 1971 | 69 | 4.1 |
| 1972 | 63 | 3.7 |
| 1973 | 85 | 3.6 |
| 1974 | 56 | 3.4 |
| 1975 | 11 | 1.0 |
| 1978 | 10 | 1.4 |
| 1994 | 85 | 3.1 |
| 1995 | 84 | 4.0 |
| 1996 | 65 | 3.5 |
| 1997 | 52 | 4.6 |
| 1998 | 45 | 4.2 |
| 2000 | 26 | 6.0 |
| 2001 | 58 | 2.2 |
The relationship between annual mean minimum temperature and frost days is not perfectly linear — 1975 had a lower mean minimum temperature than 2000, yet far fewer frost days — but the general pattern is clear. Years with warmer average minimum temperatures tend to produce fewer frost days. The 2000 figure of 6.0°C, the highest annual mean minimum temperature in the series, came with just 26 frost days.
For comparison, 1969's 110 frost days stands as the absolute peak. No other year in this series comes close — the next highest is 1968 with 97, followed by 1970 with 90 and both 1973 and 1994 with 85. The 1969 record has held for over five decades and shows no sign of being challenged. The recent years in the record — 1997, 1998, 2000 — all fall below 60 frost days, and 2001 returned 58, suggesting that a return to the 100-day frost year is unlikely in the current climate regime.
If you are planning an outdoor event near Glasgow, or deciding when to plant a garden, the Aberfoyle data offers a rough guide. Years in the 80s and 90s of frost days were common before 1975; after that, the series shows a marked shift to lower counts, with only 1994 and 1995 exceeding 80. Late September or early October — the end of the available record in 2001 — is typically when the first frosts begin to appear, though precise dates vary. The data here covers the full year, so the counts include both spring and autumn frosts, not just deep winter.
Source: Met Office MIDAS data, Aberfoyle station, Perthshire-in-Central-Region, covering the period 1968–2001. Official UK national weather station records.
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