Climate and monthly weather forecast
Fort Sill, OK

Located in Oklahoma, USA, Fort Sill experiences a Humid subtropical climate with no dry season under the Köppen climate classification, labeled as Cfa. Being a region that visibly sways between temperature highs and lows in the range of 23.7°F (-4.6°C) and 95.8°F (35.4°C), and witnesses annual rainfall quantities varying between 1.1" (28mm) and 4.9" (124mm), the climate retains its diversity throughout the year. Nonetheless, daylight hours per month merely surge from 9.9 hours to 14.4 hours, the modest changes in sunlight being a characteristic trait of the region.

The yearly temperature swings can be significant, particularly the contrast between the coldest temperature of 23.7°F (-4.6°C) in January and the highest temperature of 95.8°F (35.4°C) in July. The climatic layout maintains the yearly rainfall in a broad range that goes from as low as 1.1" (28mm) in January to as much as 4.9" (124mm) in May. Such weather transitions are not exclusive to rainfall or temperature. Daylight hours shift from its shortest stretch in December with 9.9 hours to its longest in June with 14.4 hours, resulting in a span of approximately 4.5 hours.

Implementing an interesting weather reach, Fort Sill advances from the temperate and cooler months to the more heated periods. The most remarkable weather swing is the significant temperature difference between the summer months of June to August when the mercury climbs to its yearly peak of 95.8°F (35.4°C), and the winter months of December to February where it dips to a low of 23.7°F (-4.6°C). Notably, May registers the highest rainfall level of 4.9" (124mm) while January bears witness to the driest spell with just 1.1" (28mm).

Upon scrutinizing climatic data and local weather patterns, it emerges that the ideal period to travel to Fort Sill generally falls between late-April to mid-June and late-September to early-November. During these periods, visitors are expected to savor moderate temperatures between 49.4°F (9.7°C) and 81.8°F (27.7°C) and adequate daylight hours ranging from 12.4 to 14 hours that provide ample time for outdoor explorations and activities.

Contrary to ideal visits, the period from late-July to mid-September signifies the most challenging time to schedule a trip to Fort Sill. During this scorching period, the area endures an oppressive weather spell with the temperature soaring to an intense 94.9°F (34.9°C) to 95.8°F (35.4°C), combined with an average rainfall of 2.2" (56mm) to 3.6" (91mm).

Spring in Fort Sill spans from March to May and these months witness a steady increase in temperatures from 38°F (3.3°C) to 81.8°F (27.7°C). Rainfall volumes rise consistently during this period, starting from 2.1" (53mm) to a substantial 4.9" (124mm) by May, while daylight hours also follow an upward pattern, extending from 12 hours to 14 hours.

Summer in Fort Sill embraces the months of June through August, characterized by highest temperatures ranging from 85.9°F (29.9°C) to 95.8°F (35.4°C). While rainfall followers a descending trend during this period, from 3.6" (91mm) to 1.9" (48mm), the long days prevail with daylight hours reaching their peak at an average of 14 hours per day.

Autumn in Fort Sill occurs between September and November and this time ushers in a refreshing reprieve from the summer heat. Temperatures decline in a gradual pattern from 85.9°F (29.9°C) to 63.2°F (17.3°C), mirroring the falling autumn leaves. Rainfall decreases in a slow yet steady pattern, from 3.7" (94mm) to 1.8" (46mm), while daylight hours dwindle from 12.4 hours to 10.4 hours.

Winter sets in Fort Sill from December until February with temperatures plummeting to between 23.7°F (-4.6°C) and 55°F (12.8°C). This period exhibits the coldest spell with the lowest sunshine, less than 10 daylight hours, accompanied by modest rainfall amounts in the region of 1.1" (28mm) to 1.3" (33mm).

For the people of Fort Sill, Oklahoma, January is associated with the chill of winter. This month sees an average high-temperature of 49.9°F (9.9°C) coupled with the chilling lows of 23.7°F (-4.6°C), making it the coldest month of the year. Weather in January »

Following the cold of January, February brings an ever so slight rise in temperatures in Fort Sill. Cold mornings, chilly evenings, and mostly sunny days define February's atmospheric climate. Rainfall is just a bit higher than January, accumulating 1.3" (33mm) throughout the month. Weather in February »

March in Fort Sill heralds the advent of spring. The days lengthen and temperatures average progresses upwards. It is worth noting that this month also sees a notable increase in rainfall, with a total of 2.1" (53mm) recorded. With fluctuating temperatures and increasing chances of precipitation, March is a month of transition and changing landscapes. With the beginning of March, Fort Sill's average high-temperature sees an increase, transitioning from a cool 55°F (12.8°C) in February to a comfortable 64.4°F (18°C). Weather in March »

Spring is in full swing in Fort Sill during April. Longer days and warmer temperatures become more consistent, forecasting what lies ahead in the coming months. Rainfall also continues to increase, reaching 2.4" (61mm), marking April as one of the wettest months of the year. Weather in April »

May witnesses the transition from spring to summer in Fort Sill. The weather warms substantially, and there is a significant increase in day length. Interestingly, May comprehends the maximum amount of rainfall for the year, measuring up to 4.9" (124mm). Weather in May »

Fort Sill in June experiences the full onset of summer. High temperatures, long days, and a decrease in rainfall characterize the month's climate. With only 3.6" (91mm) of rainfall, the weather continues to dry, and local residents brace for the mid-summer heat. June's onset in Fort Sill is marked by a subtle temperature increase, moving from a moderately hot 81.9°F (27.7°C) in May to a hot 90°F (32.2°C). Weather in June »

The weather in Fort Sill reaches its peak in July. The town experiences the highest temperature and the maximum length of daylit hours in this month. Residents prepare for the extreme summer heat that averages to a high of 95.8°F (35.4°C) and a low of 71°F (21.7°C). Weather in July »

August in Fort Sill, much like July, remains hot and sunny, albeit with a slight drop in temperature. The overall weather pattern is rather stable, with more predictable heat conditions. Rainfall also sees an increment reaching a total of 2.2" (56mm). Weather in August »

September in Fort Sill signifies the arrival of autumn with moderate temperatures. The fact that only 3.7" (94mm) of rain falls and days become slightly shorter are indications of the settling summer period. It is a period of delightful weather with lesser heat intensity and light showers scattered throughout the month. As Fort Sill enters September, the average high-temperature decreases from the a hot 94.8°F (34.9°C) of August to a warm 85.8°F (29.9°C). Weather in September »

October brings a palpable change in weather in Fort Sill. Temperatures steadily fall, and citizens can feel the onset of winter. While the precipitation levels come down to a total of 3" (76mm), the length of the day also reduces. Weather in October »

November brings further cooling to the climatic conditions in Fort Sill. The decrease in temperatures is noticeable, and the end of autumn becomes apparent. The rainfall for this month measures up to 1.8" (46mm). With shorter days and cooler weather, November is a prelude to the full-scale return of winter. Observing a mild shift, the average high-temperature during November reduces from October's warm 75.7°F (24.3°C) to a refreshing 63.1°F (17.3°C). Weather in November »

The last month of the year, December, sees the return of winter to Fort Sill. Full-fledged winter conditions are prevalent, with temperatures averaging from 52.3°F (11.3°C) to 27.4°F (-2.6°C). The month gets only 1.3" (33mm) of rainfall, despite having 9.9 hours of daylight each day. Weather in December »