Updated: 2026-08-07
If you live in Edinburgh or are planning a trip, the question of frost days is practical: how many mornings will you wake to a white lawn, ice on the car windscreen, or a hard ground that delays the first spring planting? The answer, based on the official Met Office record from the Royal Botanic Garden station, is that Edinburgh typically sees between 20 and 60 frost days each year, measured as days when the minimum temperature drops below 0 °C. Over the full series from 1939 to 2026, the annual count has varied enormously, and the extremes tell a clear story about the city's winter climate.
1942 holds the frostiest year on record for the Botanic Garden station
That year brought 87 frost days — the highest annual total in the dataset spanning 1939–2026. It remains the benchmark for a punishing Edinburgh winter, when frost was present on nearly one in four mornings. The contrast with the mildest year could not be sharper: 2014 delivered just 18 frost days, the lowest of the entire series. That gap of nearly fivefold between the two extremes shows how variable the city's cold season can be.
At the other end of the spectrum from 1942, the 1940s and 1950s were generally frost-prone decades. The year 1940 logged 63 frost days, 1941 recorded 60, and 1942 peaked at 87. Even 1947, with its famously harsh post-war winter, produced 77 frost days, while 1955 totalled 74 and 1958 reached 68. These are not isolated anomalies; the early decades of the series regularly exceeded 60 frost days in a single year.
Since the 1970s, the pattern becomes noticeably softer. The year 1974 fell to 22 frost days, and 1990 dropped to 20. The absolute minimum of 18 frost days arrived in 2014, a famously mild winter. In recent years, 2020 logged 25 and 2026 reached 24. Only one year in the past two decades — 2010 — returned a high count, with 76 frost days, a stark reminder that even in a warming climate, a single severe winter can still dominate the annual statistics.
Each frost day is defined by the minimum temperature measured at the Royal Botanic Garden station, the official Met Office site (station ID 00253, Edinburgh Royal Botanic Garden No. 2). A day is counted when the minimum temperature falls below 0 °C. The data is first aggregated by date to avoid duplication across station records, then the days are tallied per calendar year. The series begins on 1939-01-01 and extends to 2026-06-30, giving an 88-year window of incomplete years at the edges — 1939 and 2026 are partial years and their totals reflect that.
Alongside the frost day count, the same station also records the annual mean minimum temperature. This shows a gradual warming trend: in the early 1940s, annual minima hovered near 4.8 °C (1940) and 4.6 °C (1941). By the 2000s and 2010s, figures regularly exceeded 6.0 °C, with 1997, 2004 and 2011 reaching 6.6 °C, and 2022, 2023 and 2024 all hitting 6.7 °C. The warmest annual minima in the series came in 2014 with 6.9 °C — the same year that produced the lowest frost day count of 18. The connection is intuitive: milder nights mean fewer frosts.
The table below shows the complete annual series. Notice how the high counts cluster in the mid-20th century, while the last three decades are dominated by totals in the 30s and 40s, with only occasional spikes like 2010's 76 frost days.
The chart shows the complete annual series. The table lists the most notable years; the full series comes from Met Office.
| Year | Frost days |
|---|---|
| 1942 | 87 |
| 1947 | 77 |
| 1955 | 74 |
| 1968 | 72 |
| 1979 | 73 |
| 2010 | 76 |
| 2014 | 18 |
For gardeners, the practical takeaway is that the last frost in Edinburgh can arrive well into spring, and the first frost often appears before autumn ends. The high totals of 1942 and 1947 are historical footnotes, but the 76 frost days of 2010 show that exceptionally cold years still occur. Conversely, 2014's 18 frost days meant a year when winter barely asserted itself at all. Between these extremes, the typical year settles into a rhythm of cold snaps separated by milder interludes — a pattern that any Edinburgh resident knows well from scraping ice off the car one week and walking through daffodils the next.
The pairing of frost day counts with annual minimum temperatures paints a clear picture. While 1942's 87 frost days coincided with an annual mean minimum of just 4.5 °C, recent years like 2022, 2023 and 2024 combined 31, 43 and 31 frost days respectively with mean minima of 6.7 °C. That shift — fewer frost days alongside higher minimum temperatures — is the signature of a changing local climate. The data does not show a linear descent; it shows a staircase leading downward, with occasional steep steps back up like 2010. But the direction is unmistakable when you scan from the 1940s to the 2020s.
Source: Met Office — Edinburgh Royal Botanic Garden No. 2 station (MIDAS archive), 1939–2026.
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