Paris and Melun Minimum Temperatures During the June 2026 Heatwave

Météo-France
Extreme Weather
Data Analysis
Across 30 matched June days, Paris-Montsouris had a minimum temperature 2.7°C higher on average than Melun-Villaroche. The largest gap was 5.1°C.
Author

Climate Explorer Team

Published

July 9, 2026

Modified

September 13, 2026

Paris-Montsouris had the higher daily minimum on every day of June 2026 in the Météo-France records checked here. Across 30 matched dates, its minimum was 2.7°C warmer on average than Melun-Villaroche’s. The largest gap was 5.1°C on June 26.

That is a persistent difference between two observing sites. It is not an estimate for the whole city or for every rural location. It gives a useful local view of warmth during the June heatwave, while leaving open how much of the gap came from urban surroundings, station exposure or local weather.

Paris and Melun daily minimum temperatures in June 2026, followed by the Paris-minus-Melun difference, which is positive on all 30 dates.

The upper panel compares the measured daily minima directly. The lower panel subtracts Melun from Paris on each date; no climate normal is subtracted. Source: Météo-France daily TN.

June 26 had the largest gap, not the highest Paris minimum

Paris reached its highest daily minimum, 26.4°C, on June 25. Melun’s minimum that day was 22.2°C, leaving a 4.2°C gap. On June 26, Paris’s minimum was slightly lower at 26.2°C, but Melun’s fell to 21.1°C. The resulting gap widened to 5.1°C.

The hottest minimum and the largest station difference therefore occurred on different dates. Looking only at the Paris curve would miss that distinction. Looking only at two separate anomaly curves would also be misleading: if each station has a different normal, the distance between those curves is not the observed temperature difference.

Why compare these two stations?

Paris-Montsouris is an urban park station, with Météo-France provider ID 75114001. Melun-Villaroche, provider ID 77306001, is about 35 kilometres southeast. Nogueira and colleagues’ Paris urban-climate study used Montsouris and Melun as an urban–rural pair, while noting the limitations of a two-point comparison.

Paris-Montsouris and Melun-Villaroche station locations southeast of central Paris, about 35 kilometres apart.

The stations occupy different settings about 35 kilometres apart. The map locates the comparison; it does not map temperatures throughout Paris.

A park measurement cannot describe every street, home or neighbourhood. Nor does subtracting two daily minima give the temperature difference at one shared hour: the minima may occur at different times. The defensible result here is the difference between the stations’ daily minimum statistics.

Reproduce the comparison

Select Paris-Montsouris and Melun-Villaroche in the Météo-France Explorer for June 1–30. The observation guide covers station selection and export. The 30-row extract includes each station’s minimum and maximum, plus the calculated minimum-temperature difference.

For each date, subtract Melun’s TN from Paris’s TN, then average the 30 differences. That gives 2.7167°C, reported as 2.7°C. The source files contained both variables for both stations on all 30 dates; no missing day was interpolated.

Conclusion

Comparing Paris-Montsouris and Melun-Villaroche across June 2026 illustrates the consistent nocturnal thermal signature of an urban park relative to an outlying rural airfield. Paris recorded a higher daily minimum on all 30 days of the month, averaging a 2.7°C nocturnal excess. The divergence peaked at 5.1°C on 26 June during calm, clear heatwave conditions that favored strong radiational cooling in open rural terrain while heat remained trapped in the urban fabric. This two-station comparison quantifies the difference between two documented sensor environments, but does not measure temperature variability across every street canyon or microclimate within metropolitan Paris.

Editor’s note: Data current as of June 30, 2026. Daily minimum and maximum series for both stations were rechecked against retained Météo-France departmental source files on September 13, 2026. Operational data remain subject to subsequent quality control.

Data Annex

Provider identifiers and locations; roles are analytical descriptions
Station Météo-France ID Latitude Longitude Elevation Role
Paris-Montsouris 75114001 48.8217° N 2.3378° E 75 m Urban park
Melun-Villaroche 77306001 48.6017° N 2.6733° E 90 m Rural comparison
All 30 daily pairs used in the primary chart
Date in June Paris minimum (°C) Melun minimum (°C) Paris − Melun (°C)
01 14.7 11.4 3.3
02 16.1 15.4 0.7
03 13.5 11.0 2.5
04 14.7 14.0 0.7
05 11.6 9.6 2.0
06 13.1 10.6 2.5
07 10.3 7.9 2.4
08 14.3 12.2 2.1
09 10.7 9.0 1.7
10 12.6 10.8 1.8
11 10.3 6.6 3.7
12 16.7 15.3 1.4
13 16.3 13.4 2.9
14 14.5 10.4 4.1
15 14.2 11.1 3.1
16 20.4 17.8 2.6
17 17.3 14.3 3.0
18 18.7 16.0 2.7
19 20.6 17.6 3.0
20 20.6 17.5 3.1
21 21.4 20.0 1.4
22 24.2 20.8 3.4
23 24.1 20.0 4.1
24 25.4 20.6 4.8
25 26.4 22.2 4.2
26 26.2 21.1 5.1
27 22.5 19.9 2.6
28 21.6 18.7 2.9
29 17.2 16.6 0.6
30 17.0 13.9 3.1

The calculation uses TN and TX from the Department 75 and 77 daily source files, matched by provider ID and AAAAMMJJ. It preserves the provider’s daily dates rather than constructing UTC minima from hourly reports. The reported mean is unweighted across the 30 paired days. Daily observations can be revised by Météo-France.

Data Sources