Rainfall/ Precipitation in Tromso, Norway
- Tromso receives 1000 mm (39.4 in) of rainfall per year, or 83.3 mm (3.3 in) per month.
- On average there are 221 days per year with more than 0.1 mm (0.004 in) of rainfall (precipitation) or 18.4 days with a quantity of rain, sleet, snow etc. per month.
- The driest weather is in May when an average of 46 mm (1.8 in) of rainfall (precipitation) occurs.
- The wettest weather is in October when an average of 129 mm (5.1 in) of rainfall (precipitation) occurs.
Precipitation Table
| Climate Variable | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | Average Precipitation mm (in) | 92 (3.62) | 86 (3.4) | 69 (2.7) | 61 (2.4) | 46 (1.8) | 55 (2.2) | 73 (2.9) | 79 (3.1) | 100 (3.9) | 129 (5.1) | 105 (4.1) | 105 (4.1) | 1000 (39.4) | |
 | Precipitation Litres/m² (Gallons/ft²) | 92 (2.26) | 86 (2.11) | 69 (1.69) | 61 (1.5) | 46 (1.13) | 55 (1.35) | 73 (1.79) | 79 (1.94) | 100 (2.45) | 129 (3.16) | 105 (2.58) | 105 (2.58) | 1000 (24.53) | |
 | Number of Wet Days (probability of rain on a day) | 18 (58%) | 17 (60%) | 19 (61%) | 18 (60%) | 18 (58%) | 18 (60%) | 15 (48%) | 19 (61%) | 21 (70%) | 21 (68%) | 18 (60%) | 19 (61%) | 221 (61%) |