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Heidelberg vs Reykjavík
Comparing Heidelberg change · Reykjavík change
Heidelberg is the warmer of the two — about 8°F on the annual average; Reykjavík is the wetter, with 28 in 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 8°F on the annual average.
Precipitation
Reykjavík is the wetter — about 28 in 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 (°F) Heidelberg runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Heidelberg | 36 | 39 | 47 | 57 | 64 | 70 | 74 | 74 | 65 | 54 | 44 | 38 |
| Reykjavík | 38 | 37 | 38 | 44 | 49 | 54 | 57 | 56 | 52 | 45 | 40 | 38 |
| Difference | +1 | -2 | -9 | -13 | -15 | -16 | -17 | -18 | -13 | -9 | -4 | +1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Heidelberg | 36 | 39 | 47 | 57 | 64 | 70 |
| Reykjavík | 38 | 37 | 38 | 44 | 49 | 54 |
| Difference | +1 | -2 | -9 | -13 | -15 | -16 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Heidelberg | 74 | 74 | 65 | 54 | 44 | 38 |
| Reykjavík | 57 | 56 | 52 | 45 | 40 | 38 |
| Difference | -17 | -18 | -13 | -9 | -4 | +1 |
Avg low (°F) Heidelberg runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Heidelberg | 29 | 30 | 35 | 41 | 48 | 54 | 57 | 57 | 51 | 44 | 36 | 31 |
| Reykjavík | 29 | 28 | 29 | 34 | 39 | 44 | 47 | 47 | 43 | 37 | 32 | 31 |
| Difference | — | -2 | -6 | -7 | -9 | -10 | -10 | -10 | -7 | -7 | -4 | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Heidelberg | 29 | 30 | 35 | 41 | 48 | 54 |
| Reykjavík | 29 | 28 | 29 | 34 | 39 | 44 |
| Difference | — | -2 | -6 | -7 | -9 | -10 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Heidelberg | 57 | 57 | 51 | 44 | 36 | 31 |
| Reykjavík | 47 | 47 | 43 | 37 | 32 | 31 |
| Difference | -10 | -10 | -7 | -7 | -4 | — |
Precipitation (in) Reykjavík runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Heidelberg | 1.9 | 1.8 | 1.7 | 1.5 | 2.3 | 2.2 | 2.3 | 2.2 | 2 | 2.1 | 2 | 2.5 |
| Reykjavík | 5.2 | 5 | 4.3 | 3 | 3.7 | 2 | 3.8 | 5.3 | 5 | 4.5 | 5.9 | 4.9 |
| Difference | +3.3 | +3.2 | +2.6 | +1.5 | +1.3 | -0.2 | +1.5 | +3.1 | +3.1 | +2.4 | +3.8 | +2.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Heidelberg | 1.9 | 1.8 | 1.7 | 1.5 | 2.3 | 2.2 |
| Reykjavík | 5.2 | 5 | 4.3 | 3 | 3.7 | 2 |
| Difference | +3.3 | +3.2 | +2.6 | +1.5 | +1.3 | -0.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Heidelberg | 2.3 | 2.2 | 2 | 2.1 | 2 | 2.5 |
| Reykjavík | 3.8 | 5.3 | 5 | 4.5 | 5.9 | 4.9 |
| Difference | +1.5 | +3.1 | +3.1 | +2.4 | +3.8 | +2.3 |
Snowfall (in)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Heidelberg | — | — | — | — | — | — | — | — | — | — | — | — |
| Reykjavík | 10.8 | 15.8 | 11.4 | 4.6 | 0.4 | 0 | 0 | 0 | 0 | 0.4 | 8.2 | 11.9 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Heidelberg | — | — | — | — | — | — |
| Reykjavík | 10.8 | 15.8 | 11.4 | 4.6 | 0.4 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Heidelberg | — | — | — | — | — | — |
| Reykjavík | 0 | 0 | 0 | 0.4 | 8.2 | 11.9 |
| 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