Climate and monthly weather forecastIrkutsk, Russia
Climate and monthly weather forecast
The climate of Irkutsk
Geographically positioned in the northern region of Russia, Irkutsk experiences a Humid continental climate according to the Köppen climate classification. The city's weather pattern follows a 'Dwb' classification code, indicating severe dry winters and warm summers.The temperatures in Irkutsk show a great degree of fluctuation throughout the year. The mercury slides to a chilling low of -23.8°C (-10.8°F) in January and then gradually climbs to a comfortable average high of 25.8°C (78.4°F) by July. Rainfall and snowfall also demonstrate seasonal variations. The city sees an escalating trend from February's 7mm (0.28") of rain and 56mm (2.2") of snow, reaching a peak of 65mm (2.56") rain and 123mm (4.84") snow in April and March respectively.
Relative humidity stays relatively high during the winter months, hovering around 94% in January and February, before tapering off to about 54% by May. One unique weather pattern that makes Irkutsk stand out is its daylight hours. From a brief 8.3 hours of daylight in January, the city revels in as much as 16.7 hours from June to July. The city enjoys an average annual UV Index of 1 to 6, peaking in the summer months, and a mean visibility range from 4km (2.5mi) in January to 10km (6.2mi) in June.
The best time to visit Irkutsk
Considering the various weather parameters, summer months between June and August qualify as the most favorable time to visit Irkutsk. During this period, the temperature averages between 22.7°C (72.9°F) to 25.8°C (78.4°F) providing optimum warmth for sightseeing. Additionally, prolonged daylight hours peaking at 16.7 hours add an extra charm to the exploring experience. The UV index in these months, extending from 5 to 6, promises adequate sun exposure for vitamin D synthesis. Relative humidity around this time, at an average of 59% to 66%, creates pleasant weather conditions.The worst time to visit Irkutsk
Experiencing the bite of freezing temperatures between -19.9°C (-3.8°F) to -13.4°C (7.9°F), the months from December to February can be deemed unsuitable for tourism. The daylight hours plummet to 7.8hrs to 8.3hrs resulting in considerably less time for exploration. The relative humidity is also at its highest almost touching 94%, adding to the chilling weather's harshness.Spring weather in Irkutsk
During the spring months of March to May, Irkutsk witnesses a dramatic rise in temperature; from an average low of -12.8°C (9°F) in March to an average high of 16.3°C (61.3°F) by May. Rainfall sees a gradual increase from 17mm (0.67") to 32mm (1.26") while snowfall reduces from 123mm (4.84") to 33mm (1.3"). Daylight hours increase notably from 11.9hrs to 15.7hrs, providing ample light for daytime activities.Summer weather in Irkutsk
June to August, the summer months for Irkutsk, greet the residents with a moderate temperature range of 22.7°C (72.9°F) to 25.8°C (78.4°F). Rainfall is at its annual peak during these months, reaching an apex of 65mm (2.56") in July. Snowfall, on the other hand, is absent during this season. The city luxuriates in daylight for a splendid 14.6hrs to 16.7hrs.Autumn weather in Irkutsk
Autumn, spanning from September to November, is characterized by a gradual cooling trend with temperatures fluctuating between 14.9°C (58.8°F) and -4.6°C (23.7°F). Rainfall ranges from 30mm (1.18") to 11mm (0.43") and snowfall increases from 25mm (0.98") to 81mm (3.19"). With the average daylight hours decreasing from 12.7hrs to 8.8hrs, the days start to get shorter.Winter weather in Irkutsk
The winter months of December to February in Irkutsk are intensely cold, with temperatures ranging from a bone-chilling low of -23.8°C (-10.8°F) to a high of -10.7°C (12.7°F). Snowfall reaches its highest at 95mm (3.74") in December and drops to 56mm (2.2") by February. Rainfall is reduced to minimal levels, hovering between 7mm (0.28") to 12mm (0.47"). The daylight hours drop to their yearly low of 7.8hrs in December, ushering in the long winter nights.Weather in January
As the year begins, Irkutsk city experiences temperatures that can fall as low as -23.8°C (-10.8°F). The icy January weather in Irkutsk, Siberia's industrial city, is characterized by a biting cold due to its proximity to Lake Baikal. Weather in January »Weather in February
Slightly higher than January's average, the temperatures range from -22.8°C (-9°F) to -10.7°C (12.7°F). In February, the wintry conditions persist, exhibiting similar characteristics as the previous month in Irkutsk. Most outdoor getaway spots continue to be blanketed under snow, offering enchanting visuals. Weather in February »Weather in March
Irkutsk registers a commendable increase in temperatures to -2.1°C (28.2°F) from February's chilly -10.7°C (12.7°F). While outdoor snow activities remain a popular choice, March weather unfolds a gradual shift towards spring. Weather in March »Weather in April
With a notable increase in average temperatures to 8.6°C (47.5°F), the persistent snow finally disappears. The arrival of April signals the full transition to spring, bringing a welcome change from the biting cold of the previous months. Weather in April »Weather in May
Compared to last month, May records a temperature rise to 16.3°C (61.3°F), signifying the onset of summer. As the Siberian city transitions into an entirely new season, May involves the celebration of the natural world in full bloom. Weather in May »Weather in June
June marks the definitive arrival of summer with an average temperature soaring to a maximum of 23.9°C (75°F). Amidst significantly warmer days, the city's recreational activities shift to Lake Baikal as locals and visitors engage in swimming, fishing, and picnics. Weather in June »Weather in July
The city experiences the highest average temperatures of the year, reaching up to 25.8°C (78.4°F). July in Irkutsk contributes to the pulsating energy of the Siberian summer with picnics and BBQs becoming a regular take. With thriving wildlife and blooming Angara River banks, city residents enjoy a multitude of outdoor activities. Weather in July »Weather in August
The temperature dips from the yearly peak in July to 22.7°C (72.9°F). With the advent of August, Irkutsk experiences a gradual shift towards the refreshing autumn. Although the summer activities continue, the shorter daylight hours hint at the approaching change in seasons. Weather in August »Weather in September
As Irkutsk moves into autumn, the temperature descends to a more comfortable 14.9°C (58.8°F). September ushers in a mesmerizing array of colors with leaves turning into hues of red, orange, and gold. This beautiful transformation of the local flora paints a breathtaking vista rarely seen in the rest of the country. Weather in September »Weather in October
Compared to September, October observes a significant drop in temperatures to an average of 6.4°C (43.5°F). As the grip of autumn tightens, the leaves shed their hue and winter starts faintly buzzing in the background. While hiking trips, lake visits, and picnics continue during the early part of the month, preparations for the approaching winter start becoming evident. Weather in October »Weather in November
A precipitous drop to -4.6°C (23.7°F) from October's 6.4°C (43.5°F) indicates the imminent arrival of winter. November often serves as the prelude to Irkutsk's rigorous winter, with the city's ornamentation shifting to a frosty theme. Weather in November »Weather in December
With temperatures further dipping to -11.5°C (11.3°F), the Siberian winter settles in Irkutsk. The city gets transformed into a winter wonderland with buildings, trees, and streets blanketed in snow. Amidst asperity, December brings its unique charm, fostering a festive spirit as the new year's anticipation sweeps the city. Weather in December »Updated: Jan 25, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, with its average high-temperature of -13.4°C (7.9°F) and an average low-temperature of -23.8°C (-10.8°F), holds the record as the coldest month.
January and February, with an average relative humidity of 94%, are most humid months in Irkutsk, Russia.
January and February are months with the least rain when the rain falls for 2.3 days and typically aggregates up to 7mm (0.28") of rain.
In Irkutsk, Russia, during the entire year, the rain falls for 102.6 days and collects up to 310mm (12.2") of precipitation.
Months with snowfall are January through May, September through December.
Throughout the year, in Irkutsk, there are 96.3 snowfall days, and 621mm (24.45") of snow is accumulated.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1.
March is the month with the most snowfall in Irkutsk. Snow falls for 15.7 days and accumulates 123mm (4.84") of snow.
The least humid month is May, with an average relative humidity of 54%.
June through August are months without snowfall.
June has the longest days of the year, with an average of 16h and 42min of daylight.
The month with the most sunshine is June, with an average of 12.6h of sunshine.
With an average maximum UV index of 6, June is the month with the highest UV index.
July, with average temperatures reaching a high of 25.8°C (78.4°F) and a low of 11.4°C (52.5°F), is the warmest month.
July is the month with the most rainfall in Irkutsk. Rain falls for 17.3 days and accumulates 65mm (2.56") of precipitation.
With an average of 7h and 48min of daylight, December has the shortest days of the year.
Irkutsk, Russia, does not utilize Daylight Saving Time (DST). +08 timezone is used throughout the entire year.
The month with the least sunshine in Irkutsk is December, with an average of 2.8h of sunshine.
Average temperature
Irkutsk, Russia
The warmest month (with the highest average high temperature) is July (25.8°C).
The month with the lowest average high temperature is January (-13.4°C).
- Average low temperature in January:
-23.8°C - Average low temperature in February:
-22.8°C - Average low temperature in March:
-12.8°C - Average low temperature in April:
-1.7°C - Average low temperature in May:
3.3°C - Average low temperature in June:
9.3°C
The month with the highest average low temperature is July (11.4°C).
The coldest month (with the lowest average low temperature) is January (-23.8°C).
Average pressure
Irkutsk, Russia
- Average pressure in January:
1033.4mbar - Average pressure in February:
1030.6mbar - Average pressure in March:
1024.9mbar - Average pressure in April:
1019.1mbar - Average pressure in May:
1012.8mbar - Average pressure in June:
1009.1mbar
- Average pressure in July:
1006.6mbar - Average pressure in August:
1011mbar - Average pressure in September:
1017.3mbar - Average pressure in October:
1023.1mbar - Average pressure in November:
1026.4mbar - Average pressure in December:
1031.2mbar
The month with the highest atmospheric pressure is January (1033.4mbar).
The month with the lowest atmospheric pressure is July (1006.6mbar).
Average wind speed
Irkutsk, Russia
- Average wind speed in January:
5.7km/h - Average wind speed in February:
6km/h - Average wind speed in March:
7.3km/h - Average wind speed in April:
8.7km/h - Average wind speed in May:
9.8km/h - Average wind speed in June:
7.8km/h
- Average wind speed in July:
7.3km/h - Average wind speed in August:
7.5km/h - Average wind speed in September:
8.2km/h - Average wind speed in October:
7.2km/h - Average wind speed in November:
6.8km/h - Average wind speed in December:
6.1km/h
The windiest month (with the highest average wind speed) is May (9.8km/h).
The calmest month (with the lowest average wind speed) is January (5.7km/h).
Average humidity
Irkutsk, Russia
The months with the highest relative humidity are January and February (94%).
The month with the lowest relative humidity is May (54%).
Average rainfall
Irkutsk, Russia
The wettest month (with the highest rainfall) is July (65mm).
The driest months (with the least rainfall) are January and February (7mm).
Average rainfall days
Irkutsk, Russia
- Average rainfall days in January:
2.3 days - Average rainfall days in February:
2.2 days - Average rainfall days in March:
5.9 days - Average rainfall days in April:
10 days - Average rainfall days in May:
13.2 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
17.3 days - Average rainfall days in August:
14.5 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
5.5 days - Average rainfall days in November:
2.9 days - Average rainfall days in December:
2.5 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (2.2 days).
Average snowfall
Irkutsk, Russia
The month with the highest snowfall is March (123mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days
Irkutsk, Russia
- Average snowfall days in January:
15 days - Average snowfall days in February:
13.3 days - Average snowfall days in March:
15.7 days - Average snowfall days in April:
9.8 days - Average snowfall days in May:
3.3 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
1.6 days - Average snowfall days in October:
7.4 days - Average snowfall days in November:
13.8 days - Average snowfall days in December:
16.4 days
The month with the highest number of snowfall days is December (16.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight / Average sunshine
Irkutsk, Russia
- Average daylight in January:
8h and 18min - Average daylight in February:
9h and 54min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 54min - Average daylight in May:
15h and 42min - Average daylight in June:
16h and 42min
- Average daylight in July:
16h and 12min - Average daylight in August:
14h and 36min - Average daylight in September:
12h and 42min - Average daylight in October:
10h and 36min - Average daylight in November:
8h and 48min - Average daylight in December:
7h and 48min
The month with the longest days is June (Average daylight: 16h and 42min).
The month with the shortest days is December (Average daylight: 7h and 48min).
- Average sunshine in January:
3h and 12min - Average sunshine in February:
4h and 42min - Average sunshine in March:
5h and 0min - Average sunshine in April:
8h and 12min - Average sunshine in May:
10h and 30min - Average sunshine in June:
12h and 36min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
9h and 30min - Average sunshine in September:
7h and 48min - Average sunshine in October:
6h and 48min - Average sunshine in November:
4h and 30min - Average sunshine in December:
2h and 48min
The month with the most sunshine is June (Average sunshine: 12h and 36min).
The month with the least sunshine is December (Average sunshine: 2h and 48min).
Average sunshine days
Irkutsk, Russia
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
16.1 days - Average sunshine days in March:
13.9 days - Average sunshine days in April:
12.6 days - Average sunshine days in May:
14.3 days - Average sunshine days in June:
12.9 days
- Average sunshine days in July:
12.2 days - Average sunshine days in August:
14.9 days - Average sunshine days in September:
16 days - Average sunshine days in October:
20.5 days - Average sunshine days in November:
16.7 days - Average sunshine days in December:
15.8 days
The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is July (12.2 days).
Average UV index
Irkutsk, Russia
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover
Irkutsk, Russia
The month with the most cloud cover is December (Cloud cover 64).
The month with the least cloud cover is June (Cloud cover 31).
Average visibility
Irkutsk, Russia
The month with the highest visibility is June (10km).
The month with the lowest visibility is January (4km).
