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Heidelberg vs Reykjavík
Comparing Heidelberg change · Reykjavík change
Heidelberg is the warmer of the two — about 5°C on the annual average; Reykjavík is the wetter, with 705 mm more rain a year, and Heidelberg the sunnier.
How the seasons compare
The differences between Heidelberg and Reykjavík, in everyday terms.
Summers
Heidelberg has far hotter summers
Heidelberg: Mild
Reykjavík: Cool
Winters
Winters are similar
Heidelberg: Cold
Reykjavík: Cold
Rain & snow
Reykjavík is wetter
Heidelberg: Moderate rainfall
Reykjavík: Wet
Sky
Heidelberg is sunnier
Heidelberg: Often cloudy
Reykjavík: Often grey
Month-by-month charts
Temperature
Heidelberg is the warmer of the two — about 5°C on the annual average.
Precipitation
Reykjavík is the wetter — about 705 mm more across the year.
Clear skies
Heidelberg has the clearer skies — the higher line.
Exact monthly numbers
Tap a metric to open its full table. Desktop shows all twelve months; on a phone each metric splits into Jan–Jun and Jul–Dec.
Avg high (°C) Heidelberg runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Heidelberg | 2 | 4 | 8 | 14 | 18 | 21 | 24 | 23 | 18 | 12 | 7 | 3 |
| Reykjavík | 3 | 3 | 4 | 6 | 9 | 12 | 14 | 13 | 11 | 7 | 5 | 4 |
| Difference | +1 | -1 | -5 | -7 | -9 | -9 | -10 | -10 | -7 | -5 | -2 | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Heidelberg | 2 | 4 | 8 | 14 | 18 | 21 |
| Reykjavík | 3 | 3 | 4 | 6 | 9 | 12 |
| Difference | +1 | -1 | -5 | -7 | -9 | -9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Heidelberg | 24 | 23 | 18 | 12 | 7 | 3 |
| Reykjavík | 14 | 13 | 11 | 7 | 5 | 4 |
| Difference | -10 | -10 | -7 | -5 | -2 | — |
Avg low (°C) Heidelberg runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Heidelberg | -2 | -1 | 2 | 5 | 9 | 12 | 14 | 14 | 11 | 7 | 2 | -1 |
| Reykjavík | -1 | -2 | -2 | 1 | 4 | 7 | 9 | 9 | 6 | 3 | 0 | -1 |
| Difference | — | -1 | -3 | -4 | -5 | -5 | -5 | -6 | -4 | -4 | -2 | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Heidelberg | -2 | -1 | 2 | 5 | 9 | 12 |
| Reykjavík | -1 | -2 | -2 | 1 | 4 | 7 |
| Difference | — | -1 | -3 | -4 | -5 | -5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Heidelberg | 14 | 14 | 11 | 7 | 2 | -1 |
| Reykjavík | 9 | 9 | 6 | 3 | 0 | -1 |
| Difference | -5 | -6 | -4 | -4 | -2 | — |
Precipitation (mm) Reykjavík runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Heidelberg | 49 | 45 | 43 | 38 | 59 | 56 | 58 | 57 | 50 | 54 | 52 | 65 |
| Reykjavík | 133 | 127 | 109 | 75 | 93 | 50 | 95 | 135 | 128 | 114 | 149 | 123 |
| Difference | +84 | +82 | +66 | +37 | +34 | -6 | +37 | +78 | +78 | +61 | +98 | +59 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Heidelberg | 49 | 45 | 43 | 38 | 59 | 56 |
| Reykjavík | 133 | 127 | 109 | 75 | 93 | 50 |
| Difference | +84 | +82 | +66 | +37 | +34 | -6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Heidelberg | 58 | 57 | 50 | 54 | 52 | 65 |
| Reykjavík | 95 | 135 | 128 | 114 | 149 | 123 |
| Difference | +37 | +78 | +78 | +61 | +98 | +59 |
Snowfall (cm)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Heidelberg | — | — | — | — | — | — | — | — | — | — | — | — |
| Reykjavík | 28 | 40 | 29 | 12 | 1 | 0 | 0 | 0 | 0 | 1 | 21 | 30 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Heidelberg | — | — | — | — | — | — |
| Reykjavík | 28 | 40 | 29 | 12 | 1 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Heidelberg | — | — | — | — | — | — |
| Reykjavík | 0 | 0 | 0 | 1 | 21 | 30 |
| Difference | — | — | — | — | — | — |
Cloud cover (%) Reykjavík runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Heidelberg | 74 | 73 | 70 | 67 | 69 | 70 | 66 | 64 | 65 | 71 | 78 | 77 |
| Reykjavík | 85 | 82 | 82 | 79 | 76 | 79 | 81 | 79 | 79 | 78 | 82 | 84 |
| Difference | +11 | +9 | +11 | +12 | +7 | +9 | +15 | +15 | +14 | +6 | +4 | +7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Heidelberg | 74 | 73 | 70 | 67 | 69 | 70 |
| Reykjavík | 85 | 82 | 82 | 79 | 76 | 79 |
| Difference | +11 | +9 | +11 | +12 | +7 | +9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Heidelberg | 66 | 64 | 65 | 71 | 78 | 77 |
| Reykjavík | 81 | 79 | 79 | 78 | 82 | 84 |
| Difference | +15 | +15 | +14 | +6 | +4 | +7 |
Relative humidity (%) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Heidelberg | 93 | 90 | 84 | 77 | 74 | 68 | 63 | 64 | 71 | 83 | 91 | 94 |
| Reykjavík | 88 | 87 | 86 | 84 | 83 | 83 | 85 | 86 | 86 | 88 | 88 | 88 |
| Difference | -5 | -2 | +2 | +7 | +9 | +15 | +21 | +22 | +15 | +5 | -3 | -6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Heidelberg | 93 | 90 | 84 | 77 | 74 | 68 |
| Reykjavík | 88 | 87 | 86 | 84 | 83 | 83 |
| Difference | -5 | -2 | +2 | +7 | +9 | +15 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Heidelberg | 63 | 64 | 71 | 83 | 91 | 94 |
| Reykjavík | 85 | 86 | 86 | 88 | 88 | 88 |
| Difference | +21 | +22 | +15 | +5 | -3 | -6 |
How both climates are changing
Both cities are warming. Each city has its own warming trend; see its trends page for the year-by-year detail. Heidelberg trends → · Reykjavík trends →
Reykjavík from Cfc to Cfb.
Methodology & sources
Heidelberg
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Weinbiet, a weather station, about 41 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.
Reykjavík
Temperature & precipitation — 1991–2020 normals computed from 11 years of daily observations at Keflavik, a weather station, about 39 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.
← change Heidelberg · change Reykjavík → · Heidelberg page · Reykjavík page