Home › Cities › Finland › Lahti
Lahti, Finland climate
Dfb Warm-summer humid continental
Lahti has a seasonal cold-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 74°F, while the coldest is February averaging around 14°F at night. Around 24 inches of precipitation falls each year, peaking in July (2.8 inches) and easing off in April (1.2 inches). At latitude 61°N, day length swings from 5.2 hours in midwinter to 18.8 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsLahti climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 27 | 27 | 36 | 48 | 61 | 68 | 74 | 70 | 59 | 46 | 36 | 30 |
| Avg temp (°F) | 21 | 21 | 28 | 39 | 50 | 58 | 63 | 60 | 51 | 40 | 32 | 26 |
| Avg low (°F) | 16 | 14 | 20 | 30 | 39 | 47 | 53 | 50 | 42 | 34 | 28 | 21 |
| Precipitation (in) | 1.8 | 1.4 | 1.2 | 1.2 | 1.6 | 2.6 | 2.8 | 2.7 | 2.1 | 2.5 | 2.3 | 2.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 27 | 27 | 36 | 48 | 61 | 68 |
| Avg temp (°F) | 21 | 21 | 28 | 39 | 50 | 58 |
| Avg low (°F) | 16 | 14 | 20 | 30 | 39 | 47 |
| Precipitation (in) | 1.8 | 1.4 | 1.2 | 1.2 | 1.6 | 2.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 74 | 70 | 59 | 46 | 36 | 30 |
| Avg temp (°F) | 63 | 60 | 51 | 40 | 32 | 26 |
| Avg low (°F) | 53 | 50 | 42 | 34 | 28 | 21 |
| Precipitation (in) | 2.8 | 2.7 | 2.1 | 2.5 | 2.3 | 2.0 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 19 | 15 | 13 | 11 | 11 | 12 | 13 | 13 | 13 | 15 | 18 | 19 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | 0.0 | 0.3 | 0.1 | — | — | — | — |
| Days with low ≤ 32°F (days) | 29 | 26 | 28 | 19 | 7 | 0.3 | — | — | 3 | 13 | 19 | 25 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 19 | 15 | 13 | 11 | 11 | 12 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | 0.0 |
| Days with low ≤ 32°F (days) | 29 | 26 | 28 | 19 | 7 | 0.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 13 | 13 | 13 | 15 | 18 | 19 |
| Days with high ≥ 90°F (days) | 0.3 | 0.1 | — | — | — | — |
| Days with low ≤ 32°F (days) | — | — | 3 | 13 | 19 | 25 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 70 | 65 | 66 | 62 | 65 | 63 | 63 | 67 | 75 | 77 | 77 |
| Clear days (≤ 30% cloud) | 2 | 3 | 4 | 4 | 5 | 3 | 4 | 5 | 3 | 2 | 2 | 2 |
| Partly cloudy days (30–70%) | 8 | 8 | 11 | 11 | 12 | 12 | 13 | 12 | 11 | 8 | 7 | 7 |
| Cloudy days (≥ 70%) | 21 | 17 | 15 | 15 | 14 | 14 | 14 | 14 | 15 | 21 | 21 | 22 |
| Relative humidity (%) | 99 | 99 | 95 | 83 | 77 | 77 | 79 | 81 | 86 | 93 | 97 | 98 |
| Wind speed (mph) | 1.2 | 1.3 | 1.6 | 1.6 | 1.4 | 1.2 | 1.2 | 1.2 | 1.2 | 1.1 | 1.0 | 1.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 70 | 65 | 66 | 62 | 65 |
| Clear days (≤ 30% cloud) | 2 | 3 | 4 | 4 | 5 | 3 |
| Partly cloudy days (30–70%) | 8 | 8 | 11 | 11 | 12 | 12 |
| Cloudy days (≥ 70%) | 21 | 17 | 15 | 15 | 14 | 14 |
| Relative humidity (%) | 99 | 99 | 95 | 83 | 77 | 77 |
| Wind speed (mph) | 1.2 | 1.3 | 1.6 | 1.6 | 1.4 | 1.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 63 | 67 | 75 | 77 | 77 |
| Clear days (≤ 30% cloud) | 4 | 5 | 3 | 2 | 2 | 2 |
| Partly cloudy days (30–70%) | 13 | 12 | 11 | 8 | 7 | 7 |
| Cloudy days (≥ 70%) | 14 | 14 | 15 | 21 | 21 | 22 |
| Relative humidity (%) | 79 | 81 | 86 | 93 | 97 | 98 |
| Wind speed (mph) | 1.2 | 1.2 | 1.2 | 1.1 | 1.0 | 1.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 28 years of daily observations at Lahti Laune, a weather station, about 3 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.