December Weather in Monterrey, Mexico

Last updated: April 22, 2025

December in Monterrey, Mexico showcases a striking range of temperatures, with maximums reaching as high as 30°C (87°F), while the average cools to a crisp 15°C (60°F). Nighttime can dip to a chilly -2°C (28°F), creating a fascinating contrast within the month. This period is characterized by low precipitation, with just 13 mm (0.5 in) of rainfall over approximately 2 days, contributing to a relatively dry atmosphere. The humidity runs high at 84%, often making the air feel cooler than it is. Embrace the invigorating winter climate of Monterrey, offering both warmth and a touch of briskness.

December Temperature in Monterrey

In December, Monterrey, Mexico experiences a notable drop in temperatures as winter settles in. With minimums plummeting to -2°C (28°F), the chill is felt, but average daytime temperatures hover around a mild 15°C (60°F). This provides a comfortable escape from the intense heat seen in preceding months. With maximums reaching up to 30°C (87°F), December offers a perfect blend of cool mornings and warm afternoons, making it an ideal time for outdoor activities. The transition from autumn’s warmer tones to winter's crispness creates a unique and delightful climate, setting the stage for celebrations and a festive atmosphere.

December Weather in Monterrey: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Monterrey, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec586570778283808176736660
Data source: Temperature data for Monterrey generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Monterrey

December in Monterrey, Mexico, brings a modest increase in precipitation as the year draws to a close. With 13 mm (0.5 in) of rainfall spread over 2 days, it marks a slight uptick compared to the driest months earlier in the year. This month serves as a gentle reminder of the transition to winter, with precipitation levels noticeably higher than the scant amounts observed in previous months like April and November. While December's rainfall is still relatively low compared to the summer peak in July, which recorded 49 mm (1.9 in) over 8 days, it signals the region's varied climatic rhythm, offering a refreshing interlude before the typically dry January.

December Precipitation Trends in Monterrey

The chart displays monthly precipitation patterns in Monterrey, with values for each month alongside December's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec669372449326137613
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Monterrey

As December arrives in Monterrey, Mexico, residents can expect a notable increase in humidity, peaking at 84%. This rise is part of a consistent trend observed throughout the year, where humidity levels fluctuate significantly from the drier months in spring, with April dipping to 48%, to the wetter conditions experienced in late summer and early autumn. Particularly, from October to December, the humidity climbs steeply, reflecting the transition to cooler temperatures. This end-of-year spike not only illustrates the shifting climate patterns but also signals the approach of winter, making December one of the most humid months in the region.

December Average Humidity in Monterrey

This chart illustrates the average monthly humidity levels in Monterrey, with December's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how December's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec70%62%53%48%52%64%73%71%82%83%82%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Monterrey

In December, Monterrey experiences a noticeable decrease in the UV Index, dropping to 7, which falls into the high exposure category, allowing for a burn time of 25 minutes. This is a significant shift from the extreme levels seen during the summer months, where the UV Index peaked at 14 in April and May, necessitating a much shorter burn time of just 10 minutes. As the year winds down, residents and visitors alike can enjoy more prolonged outdoor activities with less risk of immediate sunburn compared to the peak months. This seasonal trend highlights Monterrey's fluctuating sun exposure throughout the year, making it essential to remain mindful of UV levels even in winter. For more detailed insights on UV conditions throughout the year, explore Monterrey UV Index.

Maximum UV Index Levels in Monterrey for December

The chart shows the monthly maximum UV Index (UVI) for Monterrey in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec710121413131313131187
Data source: Monterrey December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

December Sunshine in Monterrey

In Monterrey, Mexico, December shines with an average of 271 hours of sunlight, marking a welcome transition towards the cooler months after a peak of 357 hours in July. This slight dip in daylight mirrors the gradual trend observed throughout the year, where the sun bathes the city in increasing warmth from 217 hours in January, reaching its zenith in May and June. As summer fades and autumn sets in, daylight hours begin their steady decline, yet December maintains a vibrant brightness, inviting residents and visitors alike to enjoy outdoor activities amidst the city's stunning landscapes. The month holds onto a healthy share of sunshine, ensuring that Monterrey remains a delightful destination even as the year draws to a close.

Monthly Sunshine Duration in Monterrey: December Highlighted

The December sunshine duration represents the total number of hours Monterrey experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec217h260h309h323h353h350h357h344h294h285h269h271h
Data source: Monterrey December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Monterrey During December

In Monterrey, Mexico, the likelihood of sunny weather in December stands at 59%, making it one of the more overcast months compared to the preceding year. A noticeable trend emerges as the probability of sunshine gradually declines from the higher percentages seen earlier in the year, particularly peaking in May at 76% and remaining relatively high throughout the spring and early autumn. The winter months, notably December, see this percentage dip, suggesting a transition into cooler weather and cloudier skies. While the chances of sunny days may be waning, Monterrey still offers enjoyable weather, perfect for exploring the city before the full grip of winter sets in.

Percentage of Sunny Days in December in Monterrey

The chart illustrates the percentage of sunny days in Monterrey throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Monterrey experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec71%69%63%69%76%63%51%49%52%68%65%59%
Data source: Monterrey December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Monterrey in December

In Monterrey, Mexico, the rhythm of daylight changes throughout the year, creating a captivating cycle. December ushers in a return to shorter days, with only 10 hours of daylight, echoing the patterns observed in January and November. As the year progresses from January’s 10 hours to a peak of 13 hours in May through July, daylight gradually extends, enhancing the vibrancy of spring and summer. By late summer, the days slowly recede, dropping back to 12 hours in August and September, before settling into the familiar shorter days of winter. This dance of daylight not only marks the changing seasons but also shapes the lifestyle and activities of those in Monterrey, inviting everyone to savor the light while it lasts.

Average Daylight Hours in Monterrey for December

The chart illustrates the variation in daylight duration in Monterrey throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 44m11h 17m12h 1m12h 46m13h 23m13h 41m13h 31m12h 58m12h 15m11h 31m10h 52m10h 33m
Data source: Monterrey daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Monterrey

As December rolls into Monterrey, Mexico, the gentle caress of the wind reflects the season's transition, averaging 1.6 m/s (4 mph). This slightly subdued breeze is part of a broader trend throughout the year, where wind speeds tend to peak during the warmer months of June and March, reaching 2.6 m/s (6 mph) and 2.4 m/s (5 mph), respectively. Following that, the winds gracefully ease off as the year closes, embodying the calmness of winter. The lowest average wind speed occurs in December, nestled just above the year’s minimum observed in November, illustrating a gradual waning of activity as nature prepares for the quieter months ahead. Thus, December’s soft winds invite a cozy atmosphere, perfect for reflecting on the year past.

Average December Wind Speed in Monterrey

The chart displays monthly wind speed patterns in Monterrey, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec1.81.92.42.32.32.61.81.92.11.91.71.6 m/s
Data source: Monterrey December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Monterrey Compares to Other Months

The weather in Monterrey changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Monterrey and find detailed weather information for every month.

December and January present notable differences in weather conditions. December experiences temperatures ranging from a chilly minimum of -2°C (28°F) to a warm maximum of 30°C (87°F), with an average of 15°C (60°F). The month sees approximately 13 mm (0.5 in) of precipitation over 2 days, accompanied by a high humidity level of 84%. In contrast, January's temperatures are slightly milder, with a minimum of -1°C (30°F) and a maximum of 30°C (86°F), maintaining a similar average of 15°C (59°F). However, January is drier, receiving only 6 mm (0.2 in) of precipitation over 0 days, and features lower humidity at 70%. For a more detailed look at weather specifics, you can refer to Monterrey weather in January.

In December, the weather is notably cooler, with temperatures ranging from a minimum of -2°C (28°F) to a maximum of 30°C (87°F), and an average of 15°C (60°F). The month experiences relatively high humidity at 84% and receives about 13 mm (0.5 in) of precipitation over two days. In contrast, February brings warmer conditions, featuring temperatures that range from 0°C (31°F) at night to a scorching 35°C (96°F) during the day, with an average temperature of 18°C (65°F). Precipitation decreases to just 6 mm (0.2 in) on a single day, and the humidity drops to 62%. For more detailed insights, you can check Monterrey weather in February.

In comparing the weather conditions of December and March, December tends to be cooler and wetter, with temperatures ranging from a minimum of -2°C (28°F) to a maximum of 30°C (87°F) and an average of 15°C (60°F). It experiences about 13 mm (0.5 in) of precipitation over two days, coupled with high humidity levels at 84%. In contrast, March brings a noticeable warm-up, with temperatures ranging from a minimum of 5°C (42°F) to a sweltering maximum of 38°C (101°F) and an average of 21°C (71°F). March is drier, receiving only 9 mm (0.3 in) of precipitation and typically experiencing just one rainy day, along with significantly lower humidity at 53%. For more detailed weather information, you can check Monterrey weather in March.

In December, the weather is noticeably cooler with temperatures ranging from a brisk -2°C (28°F) at night to a warm 30°C (87°F) during the day, averaging around 15°C (60°F). The month sees about 13 mm (0.5 in) of precipitation over 2 days, contributing to a high humidity of 84%. In contrast, April brings a significant rise in temperatures, with a minimum of 9°C (49°F), an average of 25°C (77°F), and a sizzling maximum of 37°C (99°F). Precipitation drops to just 3 mm (0.1 in) over only 1 day, and the humidity decreases to a more comfortable 48%. For more details, you can check Monterrey weather in April.

In December, temperatures range from a chilly minimum of -2°C (28°F) to a warm maximum of 30°C (87°F), with an average of around 15°C (60°F). The month sees about 13 mm (0.5 in) of precipitation over two days, and humidity levels are quite high at 84%. In contrast, May experiences much warmer weather, with temperatures starting at a comfortable minimum of 13°C (56°F) and peaking at a scorching 40°C (104°F), averaging 28°C (82°F). The precipitation in May is lower, at 7 mm (0.3 in) over just one day, and humidity drops significantly to 52%. For more details on the weather in May, check out Monterrey weather in May.

In December, temperatures in Monterrey range from a chilly minimum of -2°C (28°F) to a comfortable average of 15°C (60°F), peaking at a maximum of 30°C (87°F). This month experiences relatively low precipitation, with just 13 mm (0.5 in) over about 2 days, but humidity remains high at 84%.

In contrast, June brings significantly warmer weather, with temperatures fluctuating between a minimum of 15°C (59°F) and a scorching maximum of 40°C (104°F), with an average temperature of 28°C (83°F). The month sees increased rainfall at 24 mm (0.9 in) over 4 days, though humidity drops to a more moderate 64%. For a closer look at the weather patterns, you can check Monterrey weather in June.

In December, Monterrey experiences a much cooler climate, with temperatures ranging from a minimum of -2°C (28°F) to a maximum of 30°C (87°F), while July boasts much warmer conditions with temperatures that range from a low of 18°C (65°F) up to a scorching 37°C (99°F). During December, the average temperature is milder at 15°C (60°F) and the region sees much less precipitation, with only 13 mm (0.5 in) over about 2 days. In contrast, July is considerably wetter, receiving 49 mm (1.9 in) of rain across 8 days, albeit with lower humidity at 73% compared to December's 84%. For more detailed information, you can check out Monterrey weather in July.

In December, the weather is significantly cooler, with temperatures ranging from a minimum of -2°C (28°F) to a maximum of 30°C (87°F) and an average of 15°C (60°F). The month sees minimal precipitation of 13 mm (0.5 in) over just 2 days, accompanied by high humidity at 84%. In contrast, August experiences much warmer temperatures, with a minimum of 16°C (61°F) and a maximum reaching 36°C (97°F), resulting in an average of 27°C (81°F). Additionally, August has a greater precipitation level of 32 mm (1.2 in) spread over 5 days, along with a lower humidity of 71%. For more specific details about August weather, visit Monterrey weather in August.

When comparing the weather in December and September, notable differences emerge. December features a broader temperature range, with minimums plummeting to -2°C (28°F) and maximums reaching up to 30°C (87°F). In contrast, September maintains higher averages, with minimums of 15°C (60°F) and highs peaking at 37°C (99°F). Precipitation patterns also diverge; December sees only 13 mm over just 2 days, while September has significantly more rainfall at 61 mm spread over 9 days. Humidity levels are fairly similar, with December at 84% and September at 82%. For a detailed look at what to expect, check out Monterrey weather in September.

In comparing the weather of December and October, we see notable differences in temperature and precipitation patterns. December experiences a milder range with minimum temperatures dropping to -2°C (28°F) and maximums reaching up to 30°C (87°F), averaging around 15°C (60°F). In contrast, October boasts warmer temperatures, with a minimum of 8°C (47°F) and a maximum of 36°C (97°F), averaging at 23°C (73°F). Additionally, October receives significantly more precipitation, totaling 37 mm (1.4 in) over 5 days, compared to December's lighter 13 mm (0.5 in) over just 2 days. Both months have high humidity levels, with December at 84% and October at 83%. For more detailed insights on October weather, check Monterrey weather in October.

In comparing the weather of December to that of November, we can see some notable differences. December experiences a slightly wider temperature range, with minimums of -2°C (28°F) and maximums reaching up to 30°C (87°F), while November sees slightly higher average temperatures, peaking at 33°C (91°F). Precipitation in December is more frequent with 13 mm (0.5 in) over 2 days, compared to November’s 6 mm (0.2 in) over just 1 day. Humidity levels are also slightly elevated in December at 84%, compared to 82% in November. For more detailed information, you can check Monterrey weather in November.

Compare Monterrey's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Monterrey

In December, Monterrey experiences a notable shift in weather compared to the warmer months, bringing cooler temperatures that can dip as low as -2°C (28°F) at night, while daytime highs reach a comfortable 30°C (87°F). With an average temperature of 15°C (60°F), it's a great time to enjoy the city's festive atmosphere. Unlike the more humid and rainy summer months, December features significantly lower rainfall, averaging just 13 mm (0.5 in) over a couple of days, making it a relatively dry time of year with humidity levels around 84%. For more insights into how Monterrey's weather shapes its vibrant culture, visit Monterrey Climate.