Ust-Ilimsk climate
Ust-Ilimsk (Irkutsk Oblast, Russia) has a subarctic climate (Köppen Dfc). The average temperature over the year is −2 °C28 °F, and about 554 mm22 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Ust-Ilimsk climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | −19−2 | −26−16 | −23−9 | 251.0 | 31 |
| Feb | −155 | −24−11 | −19−3 | 210.8 | 28 |
| Mar | −622 | −146 | −1014 | 301.2 | 31 |
| Apr | 337 | −622 | −130 | 411.6 | 27 |
| May | 1355 | 236 | 846 | 592.3 | 13 |
| Jun | 2272 | 1152 | 1762 | 702.7 | 0 |
| Jul | 2475 | 1356 | 1965 | 662.6 | 0 |
| Aug | 2169 | 1050 | 1660 | 582.3 | 0 |
| Sep | 1254 | 337 | 745 | 622.5 | 8 |
| Oct | 235 | −524 | −229 | 522.1 | 27 |
| Nov | −1014 | −171 | −147 | 401.6 | 30 |
| Dec | −19−2 | −26−15 | −23−9 | 291.2 | 31 |
| Year | 2475 | −26−16 | −228 | 55422 | 227 |
“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 | 99% | 61% | 0.6 | 7:09 |
| Feb | 99% | 58% | 1.5 | 9:16 |
| Mar | 98% | 67% | 2.8 | 11:36 |
| Apr | 88% | 67% | 4.3 | 14:16 |
| May | 72% | 69% | 5.1 | 16:40 |
| Jun | 73% | 62% | 5.8 | 18:08 |
| Jul | 75% | 63% | 5.3 | 17:30 |
| Aug | 76% | 60% | 4.2 | 15:19 |
| Sep | 82% | 70% | 2.6 | 12:41 |
| Oct | 87% | 83% | 1.2 | 10:08 |
| Nov | 96% | 76% | 0.6 | 7:46 |
| Dec | 99% | 62% | 0.4 | 6:29 |
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 Ust-Ilimsk is like
The warmest month is July, with an average high of 24 °C75 °F and a low of 13 °C56 °F. The coldest is January, when highs average −19 °C−2 °F and lows −26 °C−16 °F. The climate is extremely continental — the average temperature swings by 41.3 °C74.4 °F between the coldest and the warmest month.
Annual precipitation is moderate at about 554 mm22 in. The wettest three-month stretch is May–July, which brings 35% of the annual total. The wettest month is June (70 mm2.7 in), the driest is February (21 mm0.8 in).
Relative humidity ranges from 72% in May to 99% in December. The clearest skies (lowest average cloud amount, 58%) are typical of February. Average wind speed near the ground ranges from 1 km/h (1 mph) in July to 3 km/h (2 mph) in March. Daylight lasts from about 6.5 hours in December to 18.1 hours in June.
A lasting snow cover is typical in October–April, when the average snow depth in the reanalysis exceeds 10 cm (deepest in March, about 44 cm).
Best time to visit Ust-Ilimsk
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June–August: average highs of 21 °C69 °F to 24 °C75 °F with 58 mm2.3 in to 70 mm2.7 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of −19 °C−2 °F.
Comfort score: months are ranked by how close they come to 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 Ust-Ilimsk
- Winter (December–February) — highs −19−2 to −15 °C5 °F, lows −26−16 to −24 °C−11 °F, about 25 mm1.0 in of precipitation a month. Pack heavy insulated clothing, thermal base layers, a warm hat, mittens and insulated boots.
- Spring (March–May) — highs −622 to 13 °C55 °F, lows −146 to 2 °C36 °F, about 43 mm1.7 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
- Summer (June–August) — highs 2169 to 24 °C75 °F, lows 1050 to 13 °C56 °F, about 65 mm2.5 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
- Autumn (September–November) — highs −1014 to 12 °C54 °F, lows −171 to 3 °C37 °F, about 52 mm2.0 in of precipitation a month. Pack a winter coat, hat, gloves and warm, non-slip boots and shoes with good grip, as frost is common.
How Ust-Ilimsk compares
Compared with Bratsk, about 217 km to the south, Ust-Ilimsk is on average 0.9 °C1.6 °F cooler and receives 6% more precipitation (554 mm22 in vs 525 mm21 in). The difference is largest in November (1.9 °C3.5 °F cooler).
Of the 169 places in Russia covered by World Climates, Ust-Ilimsk is the 156th warmest by annual mean temperature and the 124th wettest by annual precipitation. See all of them on the Russia climate page.
Places in other countries with the most similar temperature and rainfall pattern: Daxinganling (China, Dwb), Yakeshi (China, Dwb) and Jiagedaqi (China, Dwb).
Nearby places
- Bratsk 217 km · −1 °C30 °F · 525 mm21 in
- Kansk 464 km · 1 °C34 °F · 568 mm22 in
- Ust-Ordynskiy 592 km · 0 °C32 °F · 347 mm14 in
- Angarsk 610 km · 1 °C34 °F · 457 mm18 in
- Krasnoyarsk 627 km · 1 °C34 °F · 542 mm21 in
- Irkutsk 643 km · 1 °C34 °F · 418 mm16 in
- Tura 710 km · −7 °C19 °F · 634 mm25 in
- Ulan-Ude 755 km · 1 °C33 °F · 310 mm12 in
Frequently asked questions
What is the warmest month in Ust-Ilimsk?
July is the warmest month in Ust-Ilimsk, with an average high of 24 °C (75 °F) and an average low of 13 °C (56 °F).
What is the coldest month in Ust-Ilimsk?
January is the coldest month, with an average high of -19 °C (-2 °F) and an average low of -26 °C (-16 °F).
When does it rain the most in Ust-Ilimsk?
June is the wettest month with about 70 mm (2.7 in) of precipitation; February is the driest with about 21 mm (0.8 in).
What is the best time to visit Ust-Ilimsk?
Judging by long-term averages, the most comfortable months are June–August.
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 — most of all 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 344 m, while Ust-Ilimsk lies at about 278 m. Temperatures on this page were therefore adjusted by +0.4 °C0.8 °F using the standard lapse rate of 6.5 °C per 1,000 m.