Climate and monthly weather forecast
Thief River Falls, MN

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The climate of Thief River Falls

Thief River Falls, Minnesota, USA, sits in a humid continental climate zone. In accordance with the Köppen climate classification, it is categorized as Dfb; this implies no dry season and a warm summer. Over the space of twelve months, the weather conditions can be largely diverse.

Throughout the year, temperatures fluctuate significantly from 0°F (-17.8°C) up to 78.4°F (25.8°C). Higher temperatures dominate in July with 78.4°F (25.8°C) while February and December experience the lowest temperatures at 0°F (-17.8°C) and 7.5°F (-13.6°C) respectively. Also, relative humidity ranges from 66% in May to 93% in January and February.

Data on rainfall shows an average rainfall of between 0.63" (16mm) in January and February to 3.15" (80mm) in June. The occurrence of rains spans from 1.9 days in January to 16.3 days in June. On the other hand, snowfall ranges from zero inches in summer months (June to August) to 5.24" (133mm) in December.

It is of significant interest that hours of daylight fluctuate from 15.6 hours in July to 8.5 hours in December. In close relation to this, sunshine extends from 10.6 hours in July to 2.3 hours in January.

The best time to visit Thief River Falls

The best time to visit Thief River Falls is highly dependent on the visitor's weather preferences. However, June to August appear most favorable. Temperatures are at their maximum within this period, coupled with extended daylight hours (15.6 hours to 16 hours). These conditions enhance a variety of outdoor activities. Although rainfall is at its peak, the occurrence is less frequent (10.3 days to 16.3 days), keeping the majority of the days dry.

The worst time to visit Thief River Falls

The least conducive period for a visit appears to be within the colder months, especially December. With temperatures declining to 7.5°F (-13.6°C) and snowfall reaching 5.24" (133mm), outdoor activities become limited. Notably, there are fewer daylight hours (8.5 hours), which further restricts the range of possible activities.

Spring weather in Thief River Falls

Spring weather in Thief River Falls (March to May) comes with moderate temperatures. These range from 32.2°F (0.1°C) in March to 63.3°F (17.4°C) in May. The relative humidity shifts downwards, falling from 88% to 66%. Rainfall during this period moderately increases from 0.98" (25mm) in March to 2.24" (57mm) in May while total snowfall decreases significantly from 3.7" (94mm) in March to nearly zero in May.

Summer weather in Thief River Falls

Thief River Falls experiences its warmest weather during summer (June to August). Temperatures escalate to between 72°F (22.2°C) and 78.4°F (25.8°C). Daylight hours extend to maximum with 16 hours in June. Relative to other periods, rainfall takes a steep climb, reaching a peak of 3.15" (80mm) in June.

Autumn weather in Thief River Falls

Autumn weather from September to November sees temperatures drop from 68.9°F (20.5°C) to 34.3°F (1.3°C). The duration of daylight decreases from 12.6 hours to 9.3 hours. Autumn experiences a decline in rainfall, dropping from a rate of 2.09" (53mm) in October down to 0.67" (17mm) in November.

Winter weather in Thief River Falls

Winters in Thief River Falls are notably cold. From December to February, temperatures decrease to between 7.5°F (-13.6°C) and 18.5°F (-7.5°C). Ice and snow become more common as temperatures drop below the freezing point. Snowfall reaches a high point of 5.24" (133mm) in December.

Weather in January

January is marked by winter's icy grip, with the average temperature high of just 13.8°F (-10.1°C) and the lowest of 0°F (-17.8°C). During January the city is painted in white owing to the high frequency of snowfall days. The limited daylight hours coupled with a sun duration of less than half the daylight contributes to this chilly sensation. Weather in January »

Weather in February

In February, the chilling cold of January sees a slight relief. This period witnesses an average temperature high and low, rising from January, with conditions remaining relatively dry due to less than an inch of precipitation. Weather in February »

Weather in March

March sees an increase in temperature to 32.2°F (0.1°C) and 18.3°F (-7.6°C) for the average highs and lows, paving the way for the onset of spring. It lures more precipitation than February, including increased rainfall. Even though the daylight hours extend, the sunlight duration sees a significant improvement. Weather in March »

Weather in April

Spring firmly establishes itself in April with an average high temperature escalating to a comfortable 48.7°F (9.3°C), while lows average at 32.7°F (0.4°C). April heralds an era of further climate shift, witnessing increased precipitation, which primarily falls as rain instead of snow. Weather in April »

Weather in May

May brings a significant rise in temperature, with temperatures hovering in the warmer range. The increased temperatures bolster the creation of a more humid environment. While the month experiences higher rainfall, it also houses the longest sunshine duration, balancing the weather conditions adequately. Weather in May »

Weather in June

In June, Thief River Falls, Minnesota, is graced with summer, raising the average temperature highs to 72°F (22.2°C) with lows over 50°F (10°C). It's the wettest month with rainfall reaching 3.15" (80mm) alongside the highest relative humidity. Weather in June »

Weather in July

July is the hottest month, having temperature highs and lows hitting 78.4°F (25.8°C) and 58.8°F (14.9°C) respectively. Rainfall reduces compared to June, providing visitors more leeway to engage in outdoor activities in Thief River Falls, Minnesota. Weather in July »

Weather in August

The weather in August experiences insignificant changes compared to July except for a slight dip in the average temperature and an increase in cloud cover. August continues to uphold long daylight hours and an extended duration of sunlight. Weather in August »

Weather in September

September signifies a transition towards fall, with temperatures decreasing to an average high of 68.9°F (20.5°C) and low of 49.8°F (9.9°C). Though rainfall remains static in comparison to August, the frequency of rainfall days sees an increase. Weather in September »

Weather in October

In October, the ambiance in Thief River Falls, Minnesota, becomes significantly cooler, indicating the beginning of shorter days. The cloud cover ascends again, reducing the sunshine duration further. The wind speed sees an uptick, making it the windiest month of the year. Weather in October »

Weather in November

November is characterized by a considerable drop in temperature to an average high of 34.3°F (1.3°C) and a low of 23.4°F (-4.8°C), acknowledging the approach of winter. With the reduction in daylight hours and lesser hours of sunshine, November experiences an increased frequency of snowfall days. Weather in November »

Weather in December

December welcomes winter with the lowest temperature averaging around 18.5°F (-7.5°C) for the maximum and 7.5°F (-13.6°C) for the minimum. It observes the highest snowfall in the form of 5.24" (133mm) with the increased frequency of snow days. Weather in December »
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest time of year in Thief River Falls?

Thief River Falls's coldest weather arrives in January, when temperatures average a high of 13.8°F (-10.1°C) and a low of -0°F (-17.8°C).

What is the most humid month in Thief River Falls?

January and February, with an average relative humidity of 93%, are most humid months in Thief River Falls.

What is the driest month in Thief River Falls?

January and February are months with the least rain in Thief River Falls, Minnesota, when the rain falls for 1.9 days and typically aggregates up to 0.63" (16mm) of rain.

How much does it rain in Thief River Falls?

Throughout the year, there are 104.3 rainfall days, and 18.39" (467mm) of precipitation is accumulated.

When does it snow in Thief River Falls?

January through May, October through December are months with snowfall in Thief River Falls, Minnesota.

How much does it snow in Thief River Falls?

Throughout the year, in Thief River Falls, Minnesota, there are 81.1 snowfall days, and 25.08" (637mm) of snow is accumulated.

What is the month with the least sunshine in Thief River Falls?

January has the least sunshine of the year in Thief River Falls, Minnesota, with an average of 2.3h of sunshine.

What are the months with the lowest UV index in Thief River Falls?

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index.

When is Daylight Saving Time (DST) in Thief River Falls?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.

What are the least humid months in Thief River Falls?

The months with the lowest humidity in Thief River Falls are May and August, with an average relative humidity of 66%.

What is the wettest month in Thief River Falls?

June is the month with the most rainfall in Thief River Falls. Rain falls for 16.3 days and accumulates 3.15" (80mm) of precipitation.

When it does not snow in Thief River Falls?

June through September are months without snowfall in Thief River Falls, Minnesota.

When are the longest days in Thief River Falls?

The month with the longest days is June, with an average of 16h and 0min of daylight.

What part of the year is the hottest in Thief River Falls?

The warmest period is usually observed in July and August, with the average high-temperature peaking at 78.4°F (25.8°C).

What month has the most sunshine in Thief River Falls?

July has the most sunshine of the year in Thief River Falls, Minnesota, with an average of 10.6h of sunshine.

What is the month with the highest UV index in Thief River Falls?

With an average maximum UV index of 6, July is the month with the highest UV index in Thief River Falls, Minnesota.

When does it snow the most in Thief River Falls?

The month with the most snowfall in Thief River Falls is December, when snow falls for 16.2 days and typically aggregates up to 5.24" (133mm) of snow.

What is the month with the shortest days in Thief River Falls?

December has the shortest days of the year in Thief River Falls, with an average of 8h and 24min of daylight.

Average temperature
Thief River Falls, MN

Average temperature - Thief River Falls, MN

The warmest months (with the highest average high temperature) are July and August (78.4°F).
The month with the lowest average high temperature is January (13.8°F).

The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (0°F).

Average pressure
Thief River Falls, MN

Average pressure - Thief River Falls, MN

The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

Average wind speed
Thief River Falls, MN

Average wind speed - Thief River Falls, MN

The windiest month (with the highest average wind speed) is October (10.1mph).
The calmest month (with the lowest average wind speed) is July (7.9mph).

Average humidity
Thief River Falls, MN

Average humidity - Thief River Falls, MN

The months with the highest relative humidity are January and February (93%).
The months with the lowest relative humidity are May and August (66%).

Average rainfall
Thief River Falls, MN

Average rainfall - Thief River Falls, MN

The wettest month (with the highest rainfall) is June (3.15").
The driest months (with the least rainfall) are January and February (0.63").

Average rainfall days
Thief River Falls, MN

Average rainfall days - Thief River Falls, MN

The month with the highest number of rainy days is June (16.3 days).
The month with the least rainy days is January (1.9 days).

Average snowfall
Thief River Falls, MN

Average snowfall - Thief River Falls, MN

The month with the highest snowfall is December (5.24").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Thief River Falls, MN

Average snowfall days - Thief River Falls, MN

The month with the highest number of snowfall days is December (16.2 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight / Average sunshine
Thief River Falls, MN

Average daylight / Average sunshine - Thief River Falls, MN

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).

Average sunshine days
Thief River Falls, MN

Average sunshine days - Thief River Falls, MN

The month with the most sunshine days is August (18.5 days).
The month with the least sunshine days is June (11.3 days).

Average UV index
Thief River Falls, MN

Average UV index - Thief River Falls, MN

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).

Average cloud cover
Thief River Falls, MN

Average cloud cover - Thief River Falls, MN

The months with the most cloud cover are January and February (Cloud cover 75).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility
Thief River Falls, MN

Average visibility - Thief River Falls, MN

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).

Thief River Falls, Minnesota, USA

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