Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The arrival of September corresponds with a light shift in temperature, down from a tropical 90.5°F (32.5°C) in August to a moderately hot 83.3°F (28.5°C). The nighttime temperature in Holly, Colorado, during September exhibits a clear drop from daytime highs, settling at a refreshing 61.7°F (16.5°C).Heat index
In September, the average heat index is estimated at 84.2°F (29°C). If exposure and ongoing activity persist, they might induce a state of tiredness and heat cramps.Research indicates the heat index considers values in shaded locales and with light winds. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', quantifies the warmth felt when relative humidity is considered. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Humidity
In September, the average relative humidity is 50%.Rainfall
In September, in Holly, the rain falls for 8.2 days. Throughout September, 0.91" (23mm) of precipitation is accumulated. In Holly, during the entire year, the rain falls for 87.3 days and collects up to 11.73" (298mm) of precipitation.Snowfall
In Holly, snow does not fall in June through September.Daylight
The average length of the day in September in Holly is 12h and 25min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:17 pm. On the last day of September, in Holly, sunrise is at 6:43 am and sunset at 6:32 pm MDT.
Sunshine
In Holly, Colorado, the average sunshine in September is 10h.UV index
In Holly, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Frequently asked questions
Is it hot in Holly during September?
What is the average humidity in September in Holly?
How many days does it rain in September in Holly?
When it does not snow in Holly?
Does it snow in Holly in September?
What is the average length of the day in September in Holly?
When is the sunrise / sunset in September in Holly?
How many hours of sunshine does Holly have in September?
How high is the UV index in September in Holly?
Average temperature in September
Holly, CO
- Average high temperature in September: 83.3°F
The warmest month (with the highest average high temperature) is July (93.2°F).
The month with the lowest average high temperature is December (44.4°F).
- Average low temperature in September: 61.7°F
The month with the highest average low temperature is July (70.9°F).
The coldest month (with the lowest average low temperature) is December (26.1°F).
Average pressure in September
Holly, CO
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.79"Hg).
Average wind speed in September
Holly, CO
- Average wind speed in September: 11.6mph
The windiest month (with the highest average wind speed) is April (12.9mph).
The calmest month (with the lowest average wind speed) is January (9.9mph).
Average humidity in September
Holly, CO
- Average humidity in September: 50%
The month with the highest relative humidity is January (60%).
The month with the lowest relative humidity is June (44%).
Average rainfall in September
Holly, CO
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is June (1.97").
The driest month (with the least rainfall) is January (0.28").
Average rainfall days in September
Holly, CO
- Average rainfall days in September: 8.2 days
The months with the highest number of rainy days are May and July (11.8 days).
The month with the least rainy days is February (2.5 days).
Average snowfall in September
Holly, CO
- Average snowfall in September: 0"
The month with the highest snowfall is December (1.42").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Holly, CO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (4.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Holly, CO
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 10h and 0min
The month with the most sunshine is June (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 24min).
Average sunshine days in September
Holly, CO
- Average sunshine days in September: 18.9 days
The month with the most sunshine days is November (24.8 days).
The month with the least sunshine days is July (16 days).
Average UV index in September
Holly, CO
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, November and December (UV index 2).
Average cloud cover in September
Holly, CO
- Average cloud cover in September: 17
The month with the most cloud cover is February (Cloud cover 29).
The month with the least cloud cover is June (Cloud cover 15).
Average visibility in September
Holly, CO
- Average visibility in September: 6mi
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).
Holly, Colorado, USA
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