Updated: 2026-07-31
The point of measurement closest to London is the Met Office station at High Beach (county of Essex), situated at 110 m elevation, about 20.8 km from the city centre. Its records speak clearly for the cold in the region: the most extreme January minimum ever registered there is −10.8°C, recorded on 12 January 1987. That winter morning stands as the coldest January moment in the station's entire series, and it has not been beaten in the decades since.
The date is 12 January 1987, and the value is −10.8°C. That is the January cold record for the High Beach station, the nearest official measuring point to London, based on complete daily MIDAS data from the Met Office covering 1 August 1978 through 31 December 2025. The cold of that day remains the benchmark for winter extremes in this part of Essex.
The January cold record at High Beach, near London:
−10.8°C
minimum temperature on 12 January 1987
That is the deepest freeze the station has measured during any January in its period of record — an extreme that has stood for nearly four decades.
A January minimum of −10.8°C at a station sitting 110 m above sea level in the Essex countryside is a serious cold event. In the middle of winter, with the sun low and nights long, the thermometer at High Beach is capable of dropping well below freezing, but reaching double digits below zero requires very specific conditions: a clear night, settled snow cover or dry ground, and an Arctic air mass parked over southern England. The 1987 event delivered all of those simultaneously.
For comparison within the same season type: mid-winter minima at this station routinely fall below 0°C, but the gap between a typical cold January night and the −10.8°C of 1987 is the difference between a frost and a hard, penetrating freeze that persists through the daylight hours. It is the kind of temperature that makes outdoor work impossible without heavy protection.
The value comes from the official Met Office MIDAS archive, held at the Centre for Environmental Data Analysis (CEDA). The query scans every daily minimum temperature recorded at High Beach during January months across the full series, from the earliest available entry (1 August 1978) through the latest (31 December 2025), and selects the lowest value. That is how −10.8°C on 12 January 1987 emerges as the extreme.
No other January day in the station's history has produced a lower minimum. The record is a single, isolated event — the coldest reading the thermometer has delivered in any January since measurements began.
The climate of London itself can differ from what High Beach records, and it is important to be precise here. The station sits at 110 m elevation in a semi-rural part of Essex, while central London is lower, denser with buildings, and subject to the urban heat island effect, which keeps night-time temperatures noticeably higher than in the surrounding countryside. Frost is less severe in the city centre than at High Beach; a minimum of −10.8°C at the station may have corresponded to a somewhat less extreme low within the urban core. The record is therefore the best available reference for extreme cold near London, but it is a measurement taken where the instrument stands, not a direct reading of the city itself.
Even with that caveat, the 1987 event aligns with what is known about that winter across southern England: a period of intense cold, deep snow cover and widespread double-digit negative minima at rural stations, of which High Beach is one. The 12 January date is consistent with the main cold spell of that month.
The record of −10.8°C is the single coldest morning, but the full picture of January cold at High Beach includes the specific date of that extreme and no other. The series contains every January minimum from 1978 through 2025, and the minimum for each January is what defines the month's cold character. The absolute low for the month in 1987, as noted, is −10.8°C on 12 January 1987.
Since 1987, no January has produced a lower value, meaning the record has survived every cold wave that has passed over Essex since: the winters of 1990–91, 1995–96, 2009–10 (which brought significant cold to southern England) and the February 2018 freeze all failed to push the January minimum below the 1987 mark.
For anyone living in London or the surrounding counties, knowing the January extreme at the nearest station is a practical reference. It tells you the maximum severity that a mid-winter night can reach in this area, based on almost five decades of official measurement. Gardeners, builders, event organisers and transport planners all use such thresholds to design for the worst case, and −10.8°C is the worst case that the data has actually delivered.
It also provides a benchmark against which to measure future winters. If a new January minimum falls below −10.8°C at High Beach, that will be a genuine climatic extreme — a date to note in the same category as the great cold winters of the past.
The full daily series for High Beach was scanned, taking every January day from 1978 to 2025 without exception, and the lowest minimum was selected. The period covered is 1 August 1978 to 31 December 2025, and within that window every January with data is included in the comparison. There is no gap in the series that would hide a colder value; the query selects from all available January days in the station's record.
The result is unambiguous: the minimum of −10.8°C, dated 12 January 1987, is the coldest January reading ever registered at this station.
Source: Met Office MIDAS, official daily series at High Beach station (Essex). Period of record: 1 August 1978 – 31 December 2025.
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