Climate and monthly weather forecastGillette, WY
Climate and monthly weather forecast
The climate of Gillette
Gillette, Wyoming, situated in the heart of United States, experiences a mid-latitude steppe climate as indicated by the Köppen climate classification BSk. This entails a significant variation in temperature from month to month, sparse rainfall, and a prevalence of windy conditions.Drawing from the climate data, temperature fluctuation is a definitive feature of the weather in Gillette. High temperatures range from 29.7°F (-1.3°C) in December to 84.7°F (29.3°C) in July, while low temperatures vary between 16.7°F (-8.5°C) in February and 63.1°F (17.3°C) in July. The humidity levels exhibit a lowering trend in the summer months, with the least relative humidity of 41% noted in August, and pick up towards the year end, reaching a peak of 78% in January.
Rainfall in Gillette is not substantial, showing a peak of 3.11" (79mm) in May and otherwise remaining under 2.13" (54mm). The most damp days are observed in May with about 17.8 days of rainfall, tapering to a minimal 1.5 days in February. Gillette also experiences snowfall mainly in the cold months, with the maximum of 3.82" (97mm) observed in April. The cloud cover predominantly ranges between 16% and 43%, signifying a mostly clear sky throughout the year.
Gillette's winds are another distinguishing feature with speed ranging from 9.1mph (14.6km/h) in July and August to 11.2mph (18km/h) in April. Temperatures are considerably affected in the colder months by icy winds, pushing the real feel of cold beyond the actual temperature.
The best time to visit Gillette
The months from May to October are the best time to visit Gillette. During this period, the high temperatures hover between 52.3°F (11.3°C) and 84.7°F (29.3°C), making it ideal for outdoor activities. Humidity levels are on the lower side, providing a comfortable atmosphere.Even though May experiences the maximum rainfall, it is distributed over a larger number of days causing less disruption to travelers. The sunshine hours are the highest in this period reaching up to 11.8 hours in July and August, allowing ample daylight for sightseeing.
The worst time to visit Gillette
The period between November and February is the least advisable to plan a visit to Gillette. The weather is at its coldest, with high temperatures dropping to between 29.7°F (-1.3°C) and 44.6°F (7°C) and lows dipping to 16.7°F (-8.5°C). Moreover, the snowfall during these months makes it difficult for travelers, with January and February witnessing up to 2.09" (53mm).Additionally, the wind speeds are relatively high in these months, intensifying the brunt of cold. The short sunshine hours, from 5.8 hours to 6.3 hours, limit the duration for outdoor activities.
Spring weather in Gillette
Spring weather in Gillette, from March to May, is characterized by a rise in temperature from 44.6°F (7°C) to 62.2°F (16.8°C). Humidity levels also rise during this period, leading to the rainfall peak of 3.11" (79mm) in May. Snowfall is common in March and April with an average accumulation of up to 2.72" (69mm). Daylight hours increase progressively from 12 hours to 14.8 hours providing more time for outdoor activities.Summer weather in Gillette
In Gillette, summer extends from June to August with high temperatures peaking at 84.7°F (29.3°C) in July. The relative humidity averages around 46%, presenting a less muggy atmosphere. Rainfall averages at about 1.79" (45mm) per month with June seeing the most rainy days at 15.5. Despite this, sunshine duration remains the longest in the year, exceeding 15 hours in June.Autumn weather in Gillette
From September to November, Gillette transitions into autumn with a decline in temperature from 73.6°F (23.1°C) to 42.8°F (6°C). The falling temperatures are accompanied by a steady decrease in rainfall and an increasing number of clear, sunny days. Humidity starts to climb once again, averaging 59% over the three months. September experiences minimal snowfall, but it begins to pick up from October onwards.Winter weather in Gillette
Winter in Gillette, encompassing December through February, showcases the profound impact of the steppe climate. The high temperatures drop to a frigid 29.7°F (-1.3°C) to 30.4°F (-0.9°C). The presence of snow and the constant icy winds, reaching up to 11mph (17.7km/h), intensify the cold conditions. Even though the amount of rainfall is at its minimum, the snowfall is pronounced, reaching 2.09" (53mm) in February.Weather in January
After the quiet spell of the holiday season, Gillette ushers January in through a veil of frost. Rudimentary inspections quickly reveal that it is the coldest month in Wyoming, and with an average high of 30.4°F (-0.9°C) and a low of 17.6°F (-8°C), it is definitely not shorts weather. Weather in January »Weather in February
February succeeds January, carrying forward its frosty legacy with an average high of 30.9°F (-0.6°C) and unabated intensity. In a familiar return, expect to see vibrant blankets of snow covering the town. Interestingly, this month records fewer daylight hours than its successor, March, a trait specific to the winter months of Gillette. Weather in February »Weather in March
March marks a subtle shift in the Gillette weather patterns. The month brings a gradual rise in temperatures, promising warmth in the months to follow. A distinguishing feature is the decrease in relative humidity to 68%, a trait common to March. Weather in March »Weather in April
The approach of April in Gillette signifies the arrival of spring, matched with a significant rise in average temperatures reaching up to 52.3°F (11.3°C). This forecast can be quite deceptive as unexpected gusts of wind often bring in colder drafts. Weather in April »Weather in May
May carries the hallmark of a resplendent Gillette spring. The comfortable increase in temperatures, up to an average high of 62.2°F (16.8°C), complements the blooming landscapes. Daylight hours span over an impressive 14.8 hours, accentuating the allure of the city in daylight. Weather in May »Weather in June
June in Gillette is when summer makes its grand entrance. Swaying winds under azure skies akin to a summer parade characterizes the weather of this month. Temperatures hover at an average high of 75.6°F (24.2°C), signifying a significant climb on the mercury scale. Weather in June »Weather in July
July is the warmest month in Gillette with average high temperatures soaring to 84.7°F (29.3°C). This period is marked by warm, swift breezes that often carry the scent of summer blossoms in the air. Despite being the peak of summer, rainfall remains a constant companion uniting with the soaring temperatures in a paradoxical blend. Weather in July »Weather in August
The heat of summer in Gillette continues its reign through August, although with slightly lower temperatures than July. As the sun dominates the sky, visitors can explore the myriad landscapes Gillette has to offer. Though the rainfall is not noticeably high, the month witnesses frequent warm showers usually in the evenings. Weather in August »Weather in September
Gillette welcomes September with a gentle transition from the scorching summer towards the crispness of fall. Daylight hours start decreasing towards the second half of the month, marking the beginning of shorter days. As summer recedes, so does the rainfall but the weather seldom gets uncomfortably dry. Weather in September »Weather in October
October takes a resounding leap towards chillier conditions with an average high dropping to 55.2°F (12.9°C). Against the golden hues of fall, temperatures plummet and prompt residents to dig out their warmer attires. Gillette in October experiences an increase in humidity levels when compared to September. Weather in October »Weather in November
As November unfolds, Gillette witnesses the onset of winter amidst a palette of late fall colors. The temperatures take a dive much lower than October, along with a drastic reduction in the amount of rainfall. High wind speeds averaging 10.8mph (17.4km/h), create a notably chillier environment conducive to snowfall. Weather in November »Weather in December
December heralds the arrival of the holiday season, painting Gillette in festive hues with an added layer of frost. The average high settles at a cool 29.7°F (-1.3°C), well within the margins that define a cold month. Uniform visibility across the month ensures clear skies for stargazers and astronomy enthusiasts despite decreased daylight hours. Weather in December »Updated: Feb 14, 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
The most humid month is January, with an average relative humidity of 78%.
The month with the least rainfall is January, when the rain falls for 2 days and typically collects 0.39" (10mm) of precipitation.
In Gillette, Wyoming, during the entire year, the rain falls for 108.9 days and collects up to 15.59" (396mm) of precipitation.
January through May, September through December are months with snowfall in Gillette, Wyoming.
Throughout the year, in Gillette, there are 50.5 snowfall days, and 19.53" (496mm) of snow is accumulated.
January, February, April, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
February has the least sunshine of the year in Gillette, Wyoming, with an average of 5.6h of sunshine.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.
The month with the most snowfall is April, when snow falls for 7.1 days and typically aggregates up to 3.82" (97mm) of snow.
The month with the most rainfall in Gillette is May, when the rain falls for 17.8 days and typically aggregates up to 3.11" (79mm) of precipitation.
In Gillette, Wyoming, snow does not fall in June through August.
The month with the longest days is June, with an average of 15h and 30min of daylight.
June through August, with an average maximum UV index of 6, are months with the highest UV index in Gillette, Wyoming.
Gillette, Wyoming, experiences its average highest temperatures in July, reaching a peak of 84.7°F (29.3°C) and a minimum of 63.1°F (17.3°C).
The months with the most sunshine are July and August, with an average of 11.8h of sunshine.
With an average relative humidity of 41%, August is the least humid month in Gillette, Wyoming.
December, with its average high-temperature of 29.7°F (-1.3°C) and an average low-temperature of 17.2°F (-8.2°C), holds the record as the coldest month in Gillette, Wyoming.
The month with the shortest days in Gillette, Wyoming, is December, with an average of 8h and 54min of daylight.
Average temperature
Gillette, WY
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (29.7°F).
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is February (16.7°F).
Average pressure
Gillette, WY
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
29.98"Hg - Average pressure in April:
29.91"Hg - Average pressure in May:
29.9"Hg - Average pressure in June:
29.84"Hg
- Average pressure in July:
29.89"Hg - Average pressure in August:
29.89"Hg - Average pressure in September:
29.93"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.05"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed
Gillette, WY
- Average wind speed in January:
10.9mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.9mph - Average wind speed in April:
11.2mph - Average wind speed in May:
10.7mph - Average wind speed in June:
9.9mph
- Average wind speed in July:
9.1mph - Average wind speed in August:
9.1mph - Average wind speed in September:
10.1mph - Average wind speed in October:
11mph - Average wind speed in November:
10.8mph - Average wind speed in December:
11mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (9.1mph).
Average humidity
Gillette, WY
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (41%).
Average rainfall
Gillette, WY
- Average rainfall in January:
0.39" - Average rainfall in February:
0.43" - Average rainfall in March:
0.94" - Average rainfall in April:
2.13" - Average rainfall in May:
3.11" - Average rainfall in June:
1.89"
- Average rainfall in July:
1.77" - Average rainfall in August:
1.73" - Average rainfall in September:
1.02" - Average rainfall in October:
1.18" - Average rainfall in November:
0.55" - Average rainfall in December:
0.43"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days
Gillette, WY
- Average rainfall days in January:
2 days - Average rainfall days in February:
1.5 days - Average rainfall days in March:
6.3 days - Average rainfall days in April:
13 days - Average rainfall days in May:
17.8 days - Average rainfall days in June:
15.5 days
- Average rainfall days in July:
14.4 days - Average rainfall days in August:
14.2 days - Average rainfall days in September:
10.2 days - Average rainfall days in October:
8.8 days - Average rainfall days in November:
3.4 days - Average rainfall days in December:
1.8 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (1.5 days).
Average snowfall
Gillette, WY
- Average snowfall in January:
2.01" - Average snowfall in February:
2.09" - Average snowfall in March:
2.72" - Average snowfall in April:
3.82" - Average snowfall in May:
2.6" - Average snowfall in June:
0"
The month with the highest snowfall is April (3.82").
The months with the least snowfall are June, July and August (0").
Average snowfall days
Gillette, WY
- Average snowfall days in January:
7 days - Average snowfall days in February:
9.1 days - Average snowfall days in March:
6.4 days - Average snowfall days in April:
7.1 days - Average snowfall days in May:
2.3 days - Average snowfall days in June:
0.1 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.4 days - Average snowfall days in October:
4.8 days - Average snowfall days in November:
7.1 days - Average snowfall days in December:
6.2 days
The month with the highest number of snowfall days is February (9.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight / Average sunshine
Gillette, WY
- Average daylight in January:
9h and 18min - Average daylight in February:
10h and 30min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 30min - Average daylight in May:
14h and 48min - Average daylight in June:
15h and 30min
- Average daylight in July:
15h and 6min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 36min - Average daylight in December:
8h and 54min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in January:
5h and 48min - Average sunshine in February:
5h and 36min - Average sunshine in March:
7h and 36min - Average sunshine in April:
9h and 12min - Average sunshine in May:
10h and 0min - Average sunshine in June:
11h and 18min
- Average sunshine in July:
11h and 48min - Average sunshine in August:
11h and 48min - Average sunshine in September:
10h and 48min - Average sunshine in October:
6h and 36min - Average sunshine in November:
6h and 18min - Average sunshine in December:
5h and 54min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 36min).
Average sunshine days
Gillette, WY
- Average sunshine days in January:
21.5 days - Average sunshine days in February:
17.9 days - Average sunshine days in March:
17.8 days - Average sunshine days in April:
11.5 days - Average sunshine days in May:
9.3 days - Average sunshine days in June:
11.2 days
- Average sunshine days in July:
12.6 days - Average sunshine days in August:
12.2 days - Average sunshine days in September:
16.4 days - Average sunshine days in October:
17.5 days - Average sunshine days in November:
20.5 days - Average sunshine days in December:
22.4 days
The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is May (9.3 days).
Average UV index
Gillette, WY
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, April, November and December (UV index 2).
Average cloud cover
Gillette, WY
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility
Gillette, WY
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
