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Contents
- The climate of Stillwater
- The best time to visit Stillwater
- The worst time to visit Stillwater
- Spring weather in Stillwater
- Summer weather in Stillwater
- Autumn weather in Stillwater
- Winter weather in Stillwater
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Stillwater
Categorised as Cfa on the Köppen Climate Classification system, Stillwater enjoys a humid subtropical climate throughout the year. Situated in Oklahoma, USA, which positions the city in a weather-friendly zone limiting to an exceptional weather extreme. The general climatic conditions indicate that there is no pronounced dry season here, and a considerable amount of rainfall is received annually.
Fluctuations in the weather parameters are noticeable, with temperatures ranging from a mild average low of 30.6°F (-0.8°C) in January to a scorching high of 93°F (33.9°C) in July. Humidity is relatively consistent, staying between 62% to 75% year-round. Rainfall varies from a low of 0.98" (25mm) in December to a high of 4.25" (108mm) in May.
Snowfall is virtually non-existent from April to October, with only trace amounts in other months. However, the city does get some snowfall in the winter, predominantly in January and February, reading measures of 0.87" (22mm) and 1.42" (36mm) respectively.
Fluctuations in the weather parameters are noticeable, with temperatures ranging from a mild average low of 30.6°F (-0.8°C) in January to a scorching high of 93°F (33.9°C) in July. Humidity is relatively consistent, staying between 62% to 75% year-round. Rainfall varies from a low of 0.98" (25mm) in December to a high of 4.25" (108mm) in May.
Snowfall is virtually non-existent from April to October, with only trace amounts in other months. However, the city does get some snowfall in the winter, predominantly in January and February, reading measures of 0.87" (22mm) and 1.42" (36mm) respectively.
The best time to visit Stillwater
Given its subtropical climate, the best time to visit Stillwater would be in late spring or early autumn. Temperatures during these periods vary from a pleasant 61.7°F (16.5°C) in March up to 77°F (25°C) in May and moderate back down between 84.4°F (29.1°C) to 70.9°F (21.6°C) from September to October. However, one should note that rainfall is moderately high during the May, nearing 4.25" (108mm), which could disrupt outdoor activities.
The worst time to visit Stillwater
The less favourable time to visit Stillwater would be in the peak summer months from June to August owing to high temperatures and humidity. Temperatures reach up to 93°F (33.9°C) in July, and humidity ranges from 64% to 70%. These conditions combined can lead to discomfort and exhaustion, particularly for visitors unaccustomed to such weather.
Spring weather in Stillwater
Spring in Stillwater is characterised by a gradual increase in temperature and humidity. From March to May, temperatures rise from 61.7°F (16.5°C) to 77°F (25°C), while humidity ranges from 66% to 75%. As daylight hours extend from 12 hours in March to 14.1 hours in May, rainfall also increases, peaking at 4.25" (108mm) in May. The wind tends to drop slightly towards the end of spring, falling from 11.5mph (18.5km/h) in March to 9.9mph (15.9km/h) in May.
Summer weather in Stillwater
Summer months in Stillwater, from June to August, are characterized by hot temperatures with July being the warmest month, reaching up to 93°F (33.9°C). Humidity reduces a bit during these months, fluctuating between 64% and 70%, considerably lower than the spring months. Despite the high temperatures, rainfall also drops from its peak in May to 1.89" (48mm) in June and slightly rises again to 2.48" (63mm) in August.
Autumn weather in Stillwater
Autumn in Stillwater sees a decline in temperatures from 84.4°F (29.1°C) in September to a cooler 59.5°F (15.3°C) by November. Rainfall is also noticeably high in autumn, with September and October recording an average of 2.91" (74mm) and 2.87" (73mm) respectively. The amount of daylight decreases from 12.4 hours in September to 10.3 hours by November.
Winter weather in Stillwater
Winter in Stillwater is characterised by low temperatures and minimal rainfall. Temperatures drop to a chilly average low of 30.6°F (-0.8°C) in January, while December and February register slightly higher at 33.1°F (0.6°C) and 33.4°F (0.8°C) respectively. This period also sees the least amount of rainfall with December recording only 0.98" (25mm). Despite the drop in temperature, this season sees an increase in wind speed, reaching up to 10.4mph (16.7km/h) in December.
Weather in January
January in Stillwater, Oklahoma, is marked by generally cold conditions with a few precipitation events. Most of the time, the skies tend to be partly cloudy, but clear days do occur. The nights can be quite chilly, and frost is common this month. Weather in January »
Weather in February
The second month of the year brings a slight increase in temperature and precipitation, leading to marginally milder and wetter conditions. Stillwater often experiences more rainfall in February though snowfall is still possible. Weather in February »
Weather in March
In March, Stillwater sees a shift towards spring weather. The temperatures become less frigid, often allowing for the melt of any remaining winter snow. Relative to February, the conditions in March are noticeably warmer and windier, with less snow but increased rainfall. Weather in March »
Weather in April
April sees the onset of a more substantial warming trend and the continuation of wetter conditions. The presence of blooming flowers and leafing trees signal the arrival of spring in Stillwater. Although it precedes the high heat and humidity of summer, April experiences mild and pleasant days. Weather in April »
Weather in May
May in Stillwater is characterized by growing heat and a peak in the city's humidity and rainfall. The days become longer, allowing for more outdoor activities. Following April, May brings even warmer temperatures and features slightly less rainfall. Weather in May »
Weather in June
June in Stillwater marks the arrival of the summer season, notable for its high temperatures and lengthy daylight hours. The high heat of June brings an increased demand for cooling and hydration. Following May, June is warmer and less rainy but sees longer daylight hours. Weather in June »
Weather in July
As the peak of summer falls in July, Stillwater experiences the hottest conditions of the year. The demand for shade and air conditioning is common this time of year. Slight relief from rain is expected compared to June, but the dry season is far from reality. Weather in July »
Weather in August
Despite seeing a slight dip in temperature from July, August remains significantly hot in Stillwater. The city continues to experience long, hot days and moderately high humidity levels. Even though Autumn is on the horizon, August's weather is comparably as warm as July's. Weather in August »
Weather in September
In September, the oppressive heat of summer in Stillwater begins to lessen, marking the onset of autumn. The change in season is also marked by shorter days. Relative to August, the conditions in September are a bit cooler and less humid, but the weather remains largely warm. Weather in September »
Weather in October
October in Stillwater brings the full onset of autumn, characterized by much cooler temperatures and less rainfall. The period is marked by the changing leaves and cooler days. Compared to September, October is significantly cooler with less rainfall. Weather in October »
Weather in November
The arrival of November in Stillwater brings in the brisk conditions of late autumn. Most of the trees have shed their leaves by now, and the first signs of impending winter begin to surface. Relative to October, the conditions in November are colder, with a drop in temperatures. Weather in November »
Weather in December
December in Stillwater signals the start of the winter season, characterized by short days and lower temperatures. The holiday lights create a beautiful scene in the frost-laden city landscapes. Compared to November, December is colder and darker with the shortest daylight hours. Weather in December »
Updated: Jun 4, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest?
In Stillwater, the lowest temperatures are generally noted in January, averaging a high of 47.5°F (8.6°C) and a low of 30.6°F (-0.8°C).
How much does it rain?
Throughout the year, there are 121.4 rainfall days, and 25.28" (642mm) of precipitation is accumulated.
When does it snow in Stillwater?
January through March, November and December are months with snowfall.
How many days does it snow?
In Stillwater, during the entire year, snow falls for 7.7 days and aggregates up to 3.23" (82mm) of snow.
What is the snowiest month?
February is the month with the most snowfall. Snow falls for 2.8 days and accumulates 1.42" (36mm) of snow.
When is Daylight Saving Time (DST)?
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.
When it does not snow?
April through October are months without snowfall.
What is the most humid month?
With an average relative humidity of 75%, May is the most humid month.
What is the wettest month?
The month with the most rainfall is May, when the rain falls for 14.6 days and typically aggregates up to 4.25" (108mm) of precipitation.
When are the longest days?
The month with the longest days is June, with an average of 14h and 36min of daylight.
What are the months with the highest UV index?
June through August, with an average maximum UV index of 7, are months with the highest UV index.
What month is the hottest in Stillwater?
July proves to be the warmest month, recording an average peak temperature of 93°F (33.9°C) and a minimum temperature of 73°F (22.8°C).
What is the least humid month?
August is the least humid month, with an average relative humidity of 62%.
What month has the most sunshine in Stillwater?
With an average of 11.2h of sunshine, August has the most sunshine of the year.
What is the driest month?
December is the month with the least rainfall. Rain falls for 5.8 days and accumulates 0.98" (25mm) of precipitation.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 48min of daylight.
What is the month with the least sunshine?
December has the least sunshine of the year, with an average of 6.1h of sunshine.
What is the month with the lowest UV index?
With an average maximum UV index of 2, December is the month with the lowest UV index in Stillwater.
Average temperature
Stillwater, OK
The warmest month (with the highest average high temperature) is July (93°F).
The month with the lowest average high temperature is January (47.5°F).
The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).
Average pressure
Stillwater, OK
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.02"Hg - Average pressure in April:
29.9"Hg - Average pressure in May:
29.9"Hg - Average pressure in June:
29.87"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.93"Hg - Average pressure in September:
29.98"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed
Stillwater, OK
- Average wind speed in January:
10.3mph - Average wind speed in February:
10.6mph - Average wind speed in March:
11.4mph - Average wind speed in April:
11.5mph - Average wind speed in May:
9.9mph - Average wind speed in June:
9.6mph
- Average wind speed in July:
8.4mph - Average wind speed in August:
8.2mph - Average wind speed in September:
8.5mph - Average wind speed in October:
9.7mph - Average wind speed in November:
10.4mph - Average wind speed in December:
9.8mph
The windiest month (with the highest average wind speed) is April (11.5mph).
The calmest month (with the lowest average wind speed) is August (8.2mph).
Average humidity
Stillwater, OK
The month with the highest relative humidity is May (75%).
The month with the lowest relative humidity is August (62%).
Average rainfall
Stillwater, OK
- Average rainfall in January:
1.02" - Average rainfall in February:
1.14" - Average rainfall in March:
1.77" - Average rainfall in April:
2.8" - Average rainfall in May:
4.25" - Average rainfall in June:
1.89"
- Average rainfall in July:
2.13" - Average rainfall in August:
2.48" - Average rainfall in September:
2.91" - Average rainfall in October:
2.87" - Average rainfall in November:
1.02" - Average rainfall in December:
0.98"
The wettest month (with the highest rainfall) is May (4.25").
The driest month (with the least rainfall) is December (0.98").
Average rainfall days
Stillwater, OK
- Average rainfall days in January:
4.8 days - Average rainfall days in February:
6.9 days - Average rainfall days in March:
10.8 days - Average rainfall days in April:
13.6 days - Average rainfall days in May:
14.6 days - Average rainfall days in June:
11.2 days
- Average rainfall days in July:
12.6 days - Average rainfall days in August:
12.4 days - Average rainfall days in September:
12 days - Average rainfall days in October:
10.2 days - Average rainfall days in November:
6.5 days - Average rainfall days in December:
5.8 days
The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is January (4.8 days).
Average snowfall
Stillwater, OK
The month with the highest snowfall is February (1.42").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Stillwater, OK
- Average snowfall days in January:
1.9 days - Average snowfall days in February:
2.8 days - Average snowfall days in March:
0.8 days - Average snowfall days in April:
0.2 days - Average snowfall days in May:
0 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:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.6 days - Average snowfall days in December:
1.4 days
The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Stillwater, OK
- Average daylight in January:
10h and 0min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 4min
- Average daylight in July:
14h and 2min - Average daylight in August:
13h and 3min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 2min - Average daylight in November:
10h and 2min - Average daylight in December:
9h and 5min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in January:
6h and 1min - Average sunshine in February:
7h and 1min - Average sunshine in March:
7h and 2min - Average sunshine in April:
8h and 3min - Average sunshine in May:
9h and 1min - Average sunshine in June:
11h and 0min
- Average sunshine in July:
11h and 1min - Average sunshine in August:
11h and 1min - Average sunshine in September:
8h and 4min - Average sunshine in October:
6h and 5min - Average sunshine in November:
6h and 1min - Average sunshine in December:
6h and 1min
The month with the most sunshine is August (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 6min).
Average sunshine days
Stillwater, OK
- Average sunshine days in January:
22.9 days - Average sunshine days in February:
17.6 days - Average sunshine days in March:
17.3 days - Average sunshine days in April:
14.4 days - Average sunshine days in May:
13.7 days - Average sunshine days in June:
16.6 days
- Average sunshine days in July:
16.2 days - Average sunshine days in August:
15.7 days - Average sunshine days in September:
15.8 days - Average sunshine days in October:
19.1 days - Average sunshine days in November:
21.8 days - Average sunshine days in December:
22.6 days
The month with the most sunshine days is January (22.9 days).
The month with the least sunshine days is May (13.7 days).
Average UV index
Stillwater, OK
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover
Stillwater, OK
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is August (Cloud cover 19).
Average visibility
Stillwater, OK
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).
Stillwater, Oklahoma, USA
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