Heilbronn climate
Heilbronn (Baden-Wurttemberg, Germany) has a temperate oceanic climate (Köppen Cfb). The average temperature over the year is 11 °C52 °F, and about 785 mm31 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Heilbronn climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 439 | −229 | 134 | 672.6 | 22 |
| Feb | 642 | −229 | 235 | 502.0 | 21 |
| Mar | 1051 | 134 | 642 | 562.2 | 16 |
| Apr | 1661 | 541 | 1051 | 471.8 | 5 |
| May | 2068 | 949 | 1559 | 843.3 | 0 |
| Jun | 2476 | 1456 | 1966 | 692.7 | 0 |
| Jul | 2780 | 1560 | 2170 | 833.2 | 0 |
| Aug | 2680 | 1559 | 2169 | 783.1 | 0 |
| Sep | 2271 | 1051 | 1661 | 542.1 | 0 |
| Oct | 1661 | 644 | 1152 | 632.5 | 2 |
| Nov | 949 | 236 | 643 | 632.5 | 10 |
| Dec | 541 | −131 | 236 | 712.8 | 20 |
| Year | 2780 | −229 | 1152 | 78531 | 96 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 92% | 80% | 0.9 | 8:38 |
| Feb | 88% | 75% | 1.6 | 10:04 |
| Mar | 83% | 68% | 2.9 | 11:44 |
| Apr | 77% | 63% | 4.4 | 13:39 |
| May | 76% | 69% | 5.2 | 15:17 |
| Jun | 71% | 68% | 5.7 | 16:12 |
| Jul | 66% | 64% | 5.5 | 15:49 |
| Aug | 67% | 65% | 4.7 | 14:23 |
| Sep | 72% | 62% | 3.5 | 12:31 |
| Oct | 82% | 71% | 2.0 | 10:40 |
| Nov | 90% | 80% | 1.0 | 9:02 |
| Dec | 93% | 81% | 0.7 | 8:13 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Heilbronn is like
The warmest month is July, with an average high of 27 °C80 °F and a low of 15 °C60 °F. The coldest is January, when highs average 4 °C39 °F and lows −2 °C29 °F. Seasons are strongly marked: the warmest month is on average 20.1 °C36.3 °F warmer than the coldest.
Annual precipitation is moderate at about 785 mm31 in. Rain is spread fairly evenly through the year. The wettest month is May (84 mm3.3 in), the driest is April (47 mm1.8 in).
Relative humidity ranges from 66% in July to 93% in December. The clearest skies (lowest average cloud amount, 62%) are typical of September. Average wind speed near the ground ranges from 8 km/h (5 mph) in August to 11 km/h (7 mph) in February. Daylight lasts from about 8.2 hours in December to 16.2 hours in June.
A lasting snow cover is typical in December–February. In those months the average snow depth in the reanalysis exceeds 10 cm. It is deepest in January, at about 14 cm.
Best time to visit Heilbronn
Based on these averages, the most comfortable months for sightseeing and outdoor activities are May–September. Average highs then reach 20 °C68 °F to 27 °C80 °F. Precipitation is 54 mm2.1 in to 84 mm3.3 in per month.
The most challenging month is January, which is cold, with average highs of 4 °C39 °F.
Comfort score: months are ranked by how close they come to an ideal. That means an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Heilbronn
- Winter (December–February) — highs 439 to 6 °C42 °F, lows −229 to −1 °C31 °F, about 63 mm2.5 in of precipitation a month. Pack a warm coat, layers and closed shoes and shoes with good grip, as frost is common.
- Spring (March–May) — highs 1051 to 20 °C68 °F, lows 134 to 9 °C49 °F, about 62 mm2.4 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 2476 to 27 °C80 °F, lows 1456 to 15 °C60 °F, about 77 mm3.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
- Autumn (September–November) — highs 949 to 22 °C71 °F, lows 236 to 10 °C51 °F, about 60 mm2.4 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
How Heilbronn compares
The nearest larger place is Stuttgart, about 40 km to the south. Compared with it, Heilbronn is on average 0.5 °C0.9 °F warmer. It receives a similar amount of precipitation. The difference is largest in March (0.5 °C0.9 °F warmer).
World Climates covers 62 places in Germany. By annual mean temperature, Heilbronn is the 3rd warmest of them. By annual precipitation, it is the 23rd wettest. See all of them on the Germany climate page.
Some places in other countries have a very similar pattern of temperature and rainfall. The closest matches are Strasbourg (France, Cfb), Mulhouse (France, Cfb) and Nancy (France, Cfb).
Nearby places
- Climate in Stuttgart 40 km · 10 °C51 °F · 785 mm31 in
- Climate in Pforzheim 47 km · 10 °C51 °F · 849 mm33 in
- Climate in Karlsruhe 61 km · 11 °C52 °F · 739 mm29 in
- Climate in Mannheim 67 km · 11 °C52 °F · 739 mm29 in
- Climate in Reutlingen 72 km · 10 °C50 °F · 865 mm34 in
- Climate in Würzburg 90 km · 10 °C50 °F · 681 mm27 in
- Climate in Darmstadt 91 km · 10 °C51 °F · 669 mm26 in
- Climate in Ulm 100 km · 9 °C48 °F · 885 mm35 in
Frequently asked questions
What is the warmest month in Heilbronn?
July is the warmest month in Heilbronn. Its average high is 27 °C (80 °F) and its average low is 15 °C (60 °F).
What is the coldest month in Heilbronn?
January is the coldest month. Its average high is 4 °C (39 °F) and its average low is -2 °C (29 °F).
When does it rain the most in Heilbronn?
May is the wettest month with about 84 mm (3.3 in) of precipitation. April is the driest with about 47 mm (1.8 in).
What is the best time to visit Heilbronn?
Judging by long-term averages, the most comfortable months are May–September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station. So they can differ from airport records. The gaps are largest on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 353 m, while Heilbronn lies at about 173 m. Temperatures on this page were therefore adjusted by +1.2 °C2.1 °F using the standard lapse rate of 6.5 °C per 1,000 m.