Last updated: February 24, 2025
January in St. Louis offers a striking contrast of winter temperatures, with a maximum peaking at 19°C (67°F) and dipping as low as -22°C (-7°F), the average hovering around the freezing point at 0°C (32°F). This month also witnesses a significant precipitation of 76 mm (3.0 in) over approximately 8 days, resulting in an atmospheric humidity level of 82%. Whether you're admiring a crisp, snowy landscape or braving the chill, January’s weather in St. Louis creates a diverse experience that captures the essence of winter in the heart of the United States.
In St. Louis, January unfolds with a chilly embrace, showcasing a temperature range that truly reflects the height of winter. The minimum temperature dips to a brisk -22°C (-7°F), while the average hovers around a frosty 0°C (32°F), offering a stark contrast to the occasional highs that can reach as pleasant as 19°C (67°F). This month sets the tone for a gradual warming trend, as winter progresses into February where temperatures slightly rise. Notably, January experiences some of the coldest and most unpredictable days, often prompting both residents and visitors to bundle up against the biting cold. As the month rolls on, the average temperatures begin to inch upward, hinting at the subtle transition towards the milder and more temperate months ahead.
In January, St. Louis experiences an average precipitation of 76 mm (3.0 in) over approximately 8 days of rainfall, marking the month as relatively wet yet manageable. While January's totals are modest compared to the spring months, which see significant spikes—like March and May at 131 mm (5.2 in) and 145 mm (5.7 in) respectively—it's a reminder of the shifting weather patterns to come. As winter transitions towards spring, the frequency of rainy days tends to increase, setting the stage for a gradual uptick in overall precipitation. Interestingly, January’s figures are slightly lower than those in February, hinting at an early winter mix that soon gives way to a more substantial wet season as temperatures rise. Overall, January serves as a gentle precursor to the wetter months ahead, balancing cold and moisture in the heart of winter.
In January, St. Louis experiences a noteworthy humidity level of 82%, setting the tone for the winter months. This figure is slightly higher than the following month, February, which drops to 80%, indicating a gradual retreat from the chillier, moisture-laden air. As spring unfolds, humidity stabilizes at 80% through March and April, before a slight uptick to 82% in May just as temperatures begin to warm. The summer months see a peak in humidity with 83% in June, followed closely by 81% in July, showcasing the city’s muggy conditions. Interestingly, August returns to 80%, signaling a transition towards drier conditions as the year progresses. This is further reflected in early autumn, where humidity decreases to 76% by September and October. However, this trend reverses as November and December roll in with elevated levels of 85% and 86% respectively, emphasizing the city’s tendency to embrace a more humid end of the year. Overall, January serves as a pivotal month that connects the humid winter and ascending summer's moisture, underscoring St. Louis's unique climatic character.
In January, St. Louis experiences a moderate UV Index of 3, indicating that while sun exposure can be safely enjoyed, caution is still advisable with a burn time of 30 minutes. As the seasons progress, February sees a slight increase in UV levels to 5, signaling a need for more vigilant sun protection. By March, the UV Index rises to 6 and enters the high exposure category, reducing burn time to 25 minutes. This upward trend continues through the spring, peaking in April and May with an impressive UV Index of 9 and 10, respectively, where a mere 15 minutes can lead to sunburn. The summer months intensify this pattern, reaching an extreme level of 11 in June before slightly tapering off in July and August. As we transition back into autumn, UV levels dip but still remain significant, with burn times stabilizing around 30 minutes again by November and December. Overall, the data emphasizes a clear seasonal fluctuation in UV exposure—adapting your sun protection practices is essential throughout the year. For more detailed information, explore the St. Louis UV Index.
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In St. Louis, January ushers in the new year with 125 hours of sunshine, setting a tranquil tone for the winter months. As the seasons change, sunlight gradually intensifies; February sees a notable increase with 174 hours, hinting at the longer days ahead. By March, the city basks in 205 hours of sunlight, further signaling the arrival of spring. The sunshine continues to surge into April, reaching 241 hours, while May bursts into full bloom with an impressive 287 hours. The peak of summer in June and July showcases St. Louis at its sunniest, with 328 and 348 hours respectively, creating perfect conditions for outdoor activities. As summer wanes in August, the hours slightly decline to 330, before September brings a more moderate 290 hours. The sun then makes a gradual exit, with the fall months delivering 239 in October and 211 in November, before concluding the year with 197 hours of sunshine in December, offering a cozy end to the year and a promise of brighter days ahead.
In St. Louis, the likelihood of enjoying sunny weather in January stands at a modest 30%, mirroring the sunny probabilities of February. This sets a stark contrast against the brighter skies of spring, where March and April see an uptick to 44% and 49%, respectively. As the year progresses, the chance for sunshine peaks in the summer months, with July boasting a robust 51% likelihood. Interestingly, the late summer and early fall months, such as September with 64%, offer the most sun-drenched days. Overall, while January may not be the sunniest month, it transitions into a more vibrant sunny season as the year unfolds, highlighting a clear trend of increasing sunshine as winter gives way to spring and summer.
In St. Louis, January marks the beginning of the year with approximately 9 hours of daylight, gradually increasing as winter yields to spring. By the end of the month, daylight extends to 10 hours in February, a steady progression that invites the early blooms of March, which enjoy 11 hours of sunlight. As the days lengthen into April, residents bask in a generous 13 hours, leading to the peak of sunlight during the summer months, where daylight shines bright for 14 hours from May through July. As August arrives, the daylight begins its slow retreat, dwindling to 13 hours and continuing to decrease into the fall, with November settling at 10 hours before cycling back to 9 hours in December. This gradual transition not only enhances the beauty of the changing seasons but also energizes the rhythm of life in St. Louis.
In St. Louis, January greets residents with a gentle average wind speed of 3.3 m/s (7 mph), marking one of the quieter months of the year in terms of breeziness. As winter gives way to early spring, the winds begin to pick up pace, reaching 3.8 m/s (9 mph) by March before trailing off slightly in April. This trend of fluctuating winds continues throughout the spring and into the summer, with the warmest months of July and August experiencing their calmest breezes at just 2.1 m/s (5 mph) and 2.4 m/s (5 mph), respectively. However, the arrival of autumn brings a welcome resurgence in wind strength, as October and November see averages of 3.5 m/s (8 mph) and 3.4 m/s (8 mph). Ultimately, January sets the stage for a dynamic wind pattern that reflects the ever-changing seasons of this vibrant city.
The weather in St. Louis changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of January's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in St. Louis and find detailed weather information for every month.
January and February exhibit notable differences in weather patterns. In January, temperatures range from a chilly -22°C (-7°F) to a mild 19°C (67°F), with an average of 0°C (32°F). The month sees around 76 mm (3.0 in) of precipitation over 8 days, accompanied by relatively high humidity at 82%. In contrast, February presents a slightly milder temperature range, with minimums of -19°C (-1°F) and maximums soaring to 24°C (76°F), yielding an average temperature of 2°C (35°F). Precipitation is slightly higher at 80 mm (3.2 in), occurring over 10 days, while humidity remains lower at 80%. For more details about weather in February, check out St. Louis weather in February.
January in St. Louis is characterized by cold temperatures, with an average of 0°C (32°F) and minimum lows dipping down to -22°C (-7°F). The month sees a modest amount of precipitation at 76 mm (3.0 in) over about 8 days, accompanied by a relatively high humidity of 82%. In contrast, March offers a notable warming trend, with average temperatures rising to 8°C (47°F) and maximum highs reaching 27°C (81°F). However, March is wetter, recording 131 mm (5.2 in) of precipitation spread over 12 days, while humidity remains slightly lower at 80%. For more detailed information on March weather, you can check St. Louis weather in March.
In January, the weather is significantly colder, with temperatures ranging from a frigid -22°C (-7°F) to a relatively mild 19°C (67°F), averaging around 0°C (32°F). The month sees 76 mm (3.0 in) of precipitation over approximately 8 days, accompanied by high humidity at 82%. In contrast, April experiences a notable warming trend, with temperatures ranging from a chilly -4°C (24°F) to a much warmer 30°C (87°F), resulting in an average temperature of 13°C (55°F). Additionally, April has increased precipitation, totaling 129 mm (5.1 in) over 11 days, while humidity remains similar at 80%. For more detailed insights into April's weather, you can check out St. Louis weather in April.
January and May present strikingly different weather conditions. In January, temperatures can plummet to a minimum of -22°C (-7°F), with an average temperature around freezing (0°C or 32°F) and a maximum of 19°C (67°F). In contrast, May’s climate is much warmer, featuring a minimum of 4°C (40°F) and an average temperature of 20°C (68°F), peaking at a sweltering 34°C (94°F). Precipitation is also higher in May, with totals reaching 145 mm (5.7 in) over 14 days, compared to January's 76 mm (3.0 in) over just 8 days. Both months have the same humidity level of 82%, but the overall experience of weather in May is considerably more temperate and dynamic. For more detailed information, refer to St. Louis weather in May.
January and June present strikingly different weather patterns. In January, temperatures can plunge as low as -22°C (-7°F), with an average hovering around 0°C (32°F) and a maximum of just 19°C (67°F). The month experiences about 76 mm (3.0 in) of precipitation over 8 days, accompanied by a relatively high humidity level of 82%. In contrast, June brings a much warmer climate, with minimum temperatures around 12°C (54°F) and averages reaching 25°C (77°F), peaking at a scorching 36°C (98°F). The summer month sees increased rainfall of 101 mm (4.0 in) over 11 days, maintaining a similar humidity level at 83%. For more detailed insights into June weather patterns, check out St. Louis weather in June.
January and July present strikingly different weather patterns. In January, temperatures can drop as low as -22°C (-7°F), with an average of 0°C (32°F) and a maximum reaching 19°C (67°F). The month experiences about 76 mm (3.0 in) of precipitation over roughly 8 days, accompanied by high humidity at 82%. Conversely, July boasts much warmer temperatures, with a minimum of 16°C (61°F), an average of 26°C (80°F), and highs soaring to 38°C (101°F). Despite July’s warmer climate, it sees slightly more precipitation at 97 mm (3.8 in) over 11 days, while humidity remains comparable at 81%. For more detailed insights into July weather, you can explore St. Louis weather in July.
January and August present a stark contrast in weather conditions. January brings frigid temperatures, with lows plummeting to -22°C (-7°F) and an average of 0°C (32°F), while August boasts much warmer temperatures, ranging from a minimum of 12°C (54°F) to an average of 25°C (76°F) and highs soaring to 35°C (96°F). Precipitation is somewhat frequent in both months, with January receiving 76 mm (3.0 in) over 8 days and August experiencing 130 mm (5.1 in) across 11 days. Humidity levels are fairly comparable, hovering around 82% in January and 80% in August, though the feel of the air is vastly different in each season. For more details on August weather, visit St. Louis weather in August.
January and September present stark contrasts in weather conditions. January is characterized by its cold temperatures, with a minimum of -22°C and an average of around 0°C, highlighting the chill of winter. Precipitation is moderately high at 76 mm over about 8 days, accompanied by high humidity levels at 82%. In contrast, September brings much warmer weather, with temperatures ranging from a minimum of 7°C to a maximum of 35°C, averaging a pleasant 22°C. Precipitation is lower at 56 mm over just 7 days, and humidity is slightly reduced at 76%. This seasonal shift transforms the atmosphere significantly, making September feel much more comfortable compared to the frigid January days. For more details, you can check St. Louis weather in September.
In January, the weather is characterized by frigid temperatures, with minimums plunging to -22°C (-7°F) and an average around 0°C (32°F). In contrast, October sees a significant rise in warmth, with average temperatures reaching 15°C (59°F) and maximums soaring up to 34°C (93°F). While January experiences around 76 mm (3.0 in) of precipitation over 8 days, October has slightly more at 105 mm (4.1 in) across 11 days. Additionally, January's humidity is higher at 82%, compared to October's 76%. For more details, you can check St. Louis weather in October.
January and November present notably different weather experiences. In January, temperatures can plunge to a minimum of -22°C (-7°F) and average around 0°C (32°F), while the maximum peaks at 19°C (67°F). The month sees an average precipitation of 76 mm (3.0 in) over 8 days, with humidity levels at 82%. In contrast, November features milder temperatures, with a minimum of -13°C (9°F), an average of 7°C (44°F), and a maximum of 25°C (78°F). Precipitation is slightly lower at 75 mm (2.9 in) across 9 days, coupled with a slightly higher humidity of 85%. For more insights on November weather, check out St. Louis weather in November.
In comparing the weather of January and December, January tends to be slightly colder, with an average temperature of 0°C (32°F) against December's warmer average of 4°C (39°F). January also witnesses lower maximum temperatures, reaching up to 19°C (67°F), while December enjoys warmer highs of 22°C (71°F). While precipitation is slightly higher in January at 76 mm (3.0 in), December records a respectable 59 mm (2.3 in) over one less day of rain. Additionally, January's humidity levels drop slightly to 82% compared to December’s 86%. For more detailed information on December weather patterns, you can check St. Louis weather in December.
January in St. Louis brings a distinct chill compared to other months, with temperatures often dipping to uncomfortable lows. The average cold of this month stands in stark contrast to the warmer seasons, making it a time when residents are shrouded in layers to combat the elements. Humidity remains high during this period, combining with frequent precipitation to create a damp atmosphere that feels particularly biting. While January produces fewer dry days, the contrast in weather patterns sets the stage for a crisp start to the year. For those interested in understanding more about St. Louis' weather throughout the year, check out St. Louis Climate.