LOCAL CLIMATE INDICATORS FOR SITTINGBOURNE & SWALE
This page summarises the key climate indicators from the Met Office Climate Report for Swale (June 2026). These indicators show how the frequency of hot days, frost days, warm nights and other temperature-related metrics may change as global temperatures rise.
Heat Indicators
Hotter summers with more days above 25°C, 30°C and even 35°C under higher warming levels.
Heat stress risk increases, especially for vulnerable groups.
Cold Indicators
Fewer frost and icing days as winters become milder.
Frost days fall from 33 to single digits under high warming.
Sea Level Rise
Rising sea levels increase coastal flood risk for Swale.
Up to +47 cm by the 2080s under high-impact scenarios.
Hot Days and Heat Stress
The Met Office defines several temperature thresholds used to assess heat-related risks:
- Summer Days: maximum temperature above 25°C
- Hot Summer Days: maximum temperature above 30°C
- Extreme Summer Days: maximum temperature above 35°C
- Tropical Nights: minimum temperature above 20°C
Projected annual numbers for Swale:
| Global Warming Level | Summer Days (>25°C) |
Hot Days (>30°C) |
Extreme Days (>35°C) |
Tropical Nights (>20°C) |
|---|---|---|---|---|
| Baseline (0.6°C, 1981–2000) | 14 (14–15) | 1 (1–1) | 0 (0–0) | 0 (0–0) |
| Recent Past (1.0°C, 2001–2020) | 25 (20–33) | 2 (1–5) | 0 (0–1) | 0 (0–1) |
| Paris Agreement (1.5°C) | 27 (23–35) | 3 (2–6) | 0 (0–1) | 0 (0–1) |
| Prepare (2°C) | 34 (25–41) | 4 (2–8) | 0 (0–1) | 1 (0–1) |
| Assess Risks (4°C) | 63 (58–81) | 18 (14–25) | 2 (1–4) | 6 (3–9) |
These labels come from UK Government climate-risk guidance (CCRA4 / NAP3).
Prepare (2°C) — the warming level the UK should actively plan for. It represents a realistic mid‑century warming level under current global emissions. Local authorities and planners are expected to design for this level of change.
Assess Risks (4°C) — a high-end, low-likelihood scenario used to stress-test critical systems (flood defences, hospitals, power networks, transport). It answers the question: “What if the world warms by 4°C. Can our systems cope?”
Projected Temperature Changes
The Met Office Climate Report also provides projected changes in summer maximum and summer average temperatures for Swale as global warming levels increase. These values show how much hotter typical summer conditions may become compared with the 1981–2000 baseline.
| Global Warming Level | Summer Max Temp (°C) |
Summer Avg Temp (°C) |
|---|---|---|
| Baseline (1981-2000) (0.6°C) | 29.0°C (28.4 → 29.4) |
16.7°C (16.6 → 16.8) |
| Recent Past (2001-2020) (1.0°C) | 31.0°C (29.2 → 32.2) |
17.7°C (17.2 → 18.4) |
| Global Warming Level | Summer Max Temp (°C change) |
Summer Avg Temp (°C change) |
|---|---|---|
| Paris Agreement (1.5°C) | +2.6°C (+1.3 to +3.5) |
+1.3°C (+0.8 to +1.8) |
| Prepare (2°C) | +3.2°C (+1.7 to +4.5) |
+2.0°C (+1.0 to +2.4) |
| Assess Risks (4°C) | +6.7°C (+5.6 to +7.6) |
+4.0°C (+3.4 to +4.6) |
These values show a clear trend: as global warming levels rise, Swale experiences substantial increases in both peak summer heat and average summer conditions. This aligns with the increases in Summer Days, Hot Days and Tropical Nights shown earlier.
Cold Weather Indicators
Cold-related indicators help describe how winter conditions in Swale are expected to change as the climate warms. The Met Office report provides two key measures: frost days and icing days.
A frost day occurs when the minimum temperature falls below 0°C. These are becoming less frequent.
An icing day occurs when the maximum temperature stays below 0°C all day — a much rarer and more severe cold event.
| Global Warming Level | Frost Days (min < 0°C) |
Icing Days (max < 0°C) |
|---|---|---|
| Baseline (1981–2000) | 33 (32–34) | 2 (2–2) |
| Recent Past (2001–2020) | 25 (20–29) | 1 (0–2) |
| 1.5°C | 21 (17–26) | 1 (0–2) |
| 2°C | 18 (13–22) | 1 (0–3) |
| 4°C | 6 (3–9) | 0 (0–0) |
Degree Days
Degree days summarise how far daily mean temperatures sit above or below specific thresholds. They are widely used in energy planning, agriculture and climate analysis.
| Indicator | Baseline (1981–2000) |
Recent Past (2001–2020) |
2°C Warming | 4°C Warming |
|---|---|---|---|---|
| Heating Degree Days (< 15.5°C) |
2,047 | 1,868 | 1,664 | 1,270 |
| Cooling Degree Days (> 22°C) |
28 | 48 | 71 | 162 |
| Growing Degree Days (> 5.5°C) |
2,081 | 2,316 | 2,575 | 3,127 |
Sea Level Rise
All sea level rise values in the Met Office Climate Report are measured relative to the 1981–2000 average sea level. This 20-year period is the “zero line” used for comparison. For example, a projected rise of +29 cm in the 2050s means sea level is expected to be 29 cm higher than the 1981–2000 average.
Sea level rise is one of the most important long-term climate risks for coastal parts of Swale. Rising sea levels increase the likelihood of tidal flooding, storm surge impacts and coastal erosion.
| Time Period | Central Future | High-Impact Future |
|---|---|---|
| 2030s | +18 cm | — |
| 2050s | +29 cm | — |
| 2080s | ~35–40 cm* | +47 cm |
*The report does not explicitly list the central 2080s value, but typical projections fall in this range.
Those with very low risk tolerance, such as planners of critical infrastructure, should consult the Environment Agency’s H++ scenarios, which explore physically plausible upper-end sea level rise.
For a narrative overview, see the Climate Change Projections page.