Updated: 2026-07-31
On 18 and 19 July 2022, Cambridge-NIAB logged its most intense consecutive heatwave on record — 2 days in a row at or above 35°C. That two-day burst remains the longest such streak since the station began collecting daily readings on 1 January 1959. It wasn't just a hot spell; it was a brief but ferocious window when the thermometer refused to drop below 35°C, marking a milestone in the station's 66-year climate history.
The numbers matter because they define the upper boundary of what Cambridge-NIAB has experienced. When we talk about heatwaves — sustained periods of exceptionally high temperature — the record here isn't measured in weeks or even days of moderate warmth. It's measured in a tight, unforgiving pair of dates: 2022-07-18 to 2022-07-19, with a duration of exactly 2 days. That's the entire story of the station's most extreme consecutive hot days, and it tells us something important about the character of heat in this part of eastern England.
To put that in perspective, consider what a 2-day streak at or above 35°C means for the local climate. Cambridge-NIAB sits in one of the UK's driest and sunniest regions, but even here, such sustained extreme heat is rare. The fact that this record was set in 2022 — a year that will be remembered for its dramatic summer conditions across the UK — shows how recent events have reshaped our expectations. Before that July, no other consecutive two-day stretch had ever reached that threshold, and only a handful of single days had come close.
To understand how exceptional that 2-day run was, look at the rest of the leaderboard. Every other heat event in the station's history lasted just 1 day. That's not a coincidence; it's a statistical signature of how hard it is to get two consecutive days at or above 35°C in this location. Here are the five longest streaks recorded between 1959 and 2025:
| Start Date | End Date | Days |
|---|---|---|
| 2022-07-18 | 2022-07-19 | 2 |
| 2020-08-07 | 2020-08-07 | 1 |
| 2019-07-25 | 2019-07-25 | 1 |
| 2006-07-20 | 2006-07-20 | 1 |
| 2003-08-11 | 2003-08-11 | 1 |
Notice the pattern: four of the five events occurred in the 21st century, with dates spread across 2003, 2006, 2019, 2020, and the record-setting 2022. The 2003 event — 11 August 2003 — came during the infamous European heatwave of that summer, which was one of the most severe on record for the continent. Yet even that exceptional summer only produced a single day at or above 35°C at this station. The 2006 event on 20 July was part of a similarly notable heatwave. And then 2019 and 2020 each added their own single-day entries, showing how the frequency of these extreme days has picked up.
But what stands out is the gap between second place and first. Every one of those other streaks is exactly 1 day long. That means the 2022 event didn't just edge out the competition — it doubled the previous best, whatever that was. In statistical terms, the jump from 1 to 2 days represents a 100% increase in streak length, the kind of leap that separates an ordinary extreme from a genuine outlier. And it happened not in some distant past but in the most recent full year of data in this series.
For anyone living in Cambridge-NIAB, the difference between a single hot day and two consecutive ones is enormous. On the first day, buildings absorb heat; by the second, they can't release it fast enough, and nighttime temperatures stay high. This is what makes a 2-day streak at or above 35°C more than just a curiosity — it's a threshold that stresses infrastructure, agriculture, and human health in ways a single day can't. The record in July 2022 had real consequences: it came right after the hottest day ever recorded in the UK, and the preceding week had already pushed the region into drought conditions.
Interestingly, the record was set on 18–19 July, which is climatologically one of the warmest times of year in the UK. The station's data spans more than six decades, and yet no other July, August, or June produced even two consecutive days at this level. That's a remarkable testament to how narrowly the 2022 event hit its window. The dates themselves — 18 and 19 July — fall right in the heart of the typical summer peak, but that timing alone doesn't explain it; similar periods in other years came up short.
One more thing worth noting: the single-day events in the top 5 don't cluster in any obvious pattern. You have 2003 and 2006, then a long gap, then 2019 and 2020. The 2003 event occurred on 11 August, while the 2019 one happened on 25 July and the 2020 one on 7 August. If there were a systematic shift toward earlier or later heat, you'd expect to see it here — but the dates bounce around within the July–August window. What's clearer is the recent concentration: three of the top five occurred in just four years, from 2019 to 2022.
This analysis uses the official UK Met Office MIDAS station data for Cambridge-NIAB, with daily maximum temperature readings from the national weather station network. The archive covers the period from 1 January 1959 through 31 December 2025, providing a complete daily record of over six decades. The method identifies the longest run of consecutive days with a maximum temperature of at least 35°C, a conventional threshold for "exceptional heat" in the UK context. It scans every single day in that 66-year window, grouping consecutive qualifying days into streaks and then picking the longest one. The result is unambiguous: the 2-day streak of 2022-07-18 to 2022-07-19 stands alone as the station's record heatwave.
This threshold of 35°C is not arbitrary. It represents a level of heat that is rare in the UK's maritime climate, where the sea moderates temperature extremes. For Cambridge-NIAB, reaching that mark even once is an event; sustaining it for two days is extraordinary. The record has stood since 2022, and as of the last day of data in this series — 31 December 2025 — nothing has come close to extending it to 3 days. Whether future summers will produce longer streaks is an open question, but for now, the 18–19 July 2022 heatwave remains the definitive answer.
For residents, visitors, and event planners, this record is more than a footnote. If you're scheduling an outdoor event in the Cambridge-NIAB area around mid-to-late July, you should know that the hottest consecutive days on record fell on 18 and 19 July. The 2-day length means that any heat-related preparations — hydration, shade, cooling facilities — need to be designed for a 48-hour stretch, not just a single afternoon. On the other hand, the fact that this has only happened once in 66 years puts it in perspective: the risk is real but rare, and the vast majority of summers bring nothing close to it.
From a climate change perspective, the recent clustering of single-day events in 2019, 2020, and the record 2-day event in 2022 fits a broader trend observed across the UK Met Office network. But this page isn't about speculation; it's about what the data actually shows. And what it shows is clear: the longest heatwave ever recorded at Cambridge-NIAB lasted 2 days, and those days were 18 and 19 July 2022 — a record that continues to define the station's extreme heat benchmark.
Source: Met Office MIDAS (Integrated Data Archive System), national weather station Cambridge-NIAB, official daily maximum temperature records, 1959–2025.
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