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Contents
- 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
Weather in January
January, the same as December, in Siam, Iowa, is another subzero cold winter month, with an average temperature ranging between min 17.2°F (-8.2°C) and max 31.1°F (-0.5°C). January tends to be the coldest month, with temperatures averaging a daily high of 31.1°F (-0.5°C) and a low of 17.2°F (-8.2°C). Weather in January »
Weather in February
February, the last month of the winter in Siam, is a wintry month, with temperature in the range of an average high of 35.2°F (1.8°C) and an average low of 20.7°F (-6.3°C). February brings a marginal elevation to a wintry 35.2°F (1.8°C) from January's 31.1°F (-0.5°C) in Siam's average high-temperatures. Weather in February »
Weather in March
March, the first month of the spring in Siam, is a cool month, with an average temperature varying between 50°F (10°C) and 33.8°F (1°C). In March, the meteorological conditions markedly change with the average high-temperature ascending from a wintry 35.2°F (1.8°C) in February to a cool 50°F (10°C). Weather in March »
Weather in April
April is a refreshing spring month in Siam, Iowa, with an average temperature fluctuating between 43.3°F (6.3°C) and 61.5°F (16.4°C). A shift in the average high-temperature is noticeable in April, changing from a fresh 50°F (10°C) in March to a comfortable 61.5°F (16.4°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Siam, Iowa, with an average temperature ranging between max 70.9°F (21.6°C) and min 54.1°F (12.3°C). May brings a rise in Siam's average high-temperature, moving from a comfortable 61.5°F (16.4°C) in April to a pleasant 70.9°F (21.6°C). Weather in May »
Weather in June
June, the first month of the summer in Siam, is a warm month, with an average temperature fluctuating between 64°F (17.8°C) and 81.3°F (27.4°C). June's onset brings a rise in the average high-temperature, moving from a pleasant 70.9°F (21.6°C) in May to a warm 81.3°F (27.4°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Siam, Iowa, with an average temperature fluctuating between 66.6°F (19.2°C) and 83.8°F (28.8°C). In Siam, July is identified by the highest average temperatures, reaching a peak of 83.8°F (28.8°C) and a low of 66.6°F (19.2°C). The heat index value for July is computed to be a hot 93.2°F (34°C). Weather in July »
Weather in August
August, the last month of the summer in Siam, is also a moderately hot month, with temperature in the range of an average low of 63.7°F (17.6°C) and an average high of 82.2°F (27.9°C). Siam's average high-temperature in August is a still moderately hot 82.2°F (27.9°C), indicating a subtle variation from July. Weather in August »
Weather in September
September, the first month of the autumn in Siam, is also a moderately hot month, with an average temperature fluctuating between 76.6°F (24.8°C) and 57°F (13.9°C). As August transitions into September, Siam sees a gentle drop in the average high-temperature, transitioning from a warm 82.2°F (27.9°C) to a still moderately hot 76.6°F (24.8°C). Weather in September »
Weather in October
October, like September, in Siam, Iowa, is another enjoyable autumn month, with an average temperature varying between 61.9°F (16.6°C) and 45.1°F (7.3°C). As Siam steps into October, a marked temperature drop is observed, with the average high-temperature reducing from September's warm 76.6°F (24.8°C) to a comfortable 61.9°F (16.6°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Siam, Iowa, with an average temperature ranging between min 33.4°F (0.8°C) and max 49.1°F (9.5°C). November's arrival corresponds with a decrease in average high-temperatures, from October's refreshing 61.9°F (16.6°C) to a frosty 49.1°F (9.5°C). Weather in November »
Weather in December
The first month of the winter, December, is also an icy month in Siam, Iowa, with an average temperature fluctuating between 22.8°F (-5.1°C) and 35.2°F (1.8°C). The onset of December brings a small change in high-temperatures, falling from a frosty 49.1°F (9.5°C) in November to a cold 35.2°F (1.8°C). Weather in December »
Updated: Jun 27, 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 are the coldest months?
In Siam, January is known for its average lowest temperatures, reaching a high of 31.1°F (-0.5°C) and a low of 17.2°F (-8.2°C).
What is the most humid month?
The most humid month is January, with an average relative humidity of 80%.
How many days does it rain?
Throughout the year, there are 114.9 rainfall days, and 18.39" (467mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through April, October through December.
What is the snowiest month?
The month with the most snowfall is January, when snow falls for 7.8 days and typically aggregates up to 2.17" (55mm) of snow.
How much does it snow?
Throughout the year, there are 25.2 snowfall days, and 7.4" (188mm) of snow is accumulated.
What is the month with the least sunshine?
With an average of 4.6h of sunshine, January has the least sunshine of the year.
What is the month with the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the driest month in Siam?
The month with the least rainfall is February, when the rain falls for 3.4 days and typically collects 0.43" (11mm) of precipitation.
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?
May through September are months without snowfall.
What is the rainiest month?
The month with the most rainfall is June, when the rain falls for 14.8 days and typically aggregates up to 3.39" (86mm) of precipitation.
When are the longest days in Siam?
The month with the longest days is June, with an average of 15h and 0min of daylight.
When is the highest UV index?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What time of the year is the hottest?
With average temperatures fluctuating between a high of 83.8°F (28.8°C) and a low of 66.6°F (19.2°C), July stands out as the warmest month.
What month has the most sunshine?
The month with the most sunshine is July, with an average of 10.4h of sunshine.
What is the least humid month?
The least humid month is October, with an average relative humidity of 69%.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 18min of daylight.
Average temperature
Siam, IA
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (31.1°F).
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (17.2°F).
Average pressure
Siam, IA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
29.91"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.87"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.95"Hg - Average pressure in September:
30"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"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
Siam, IA
- Average wind speed in January:
9.9mph - Average wind speed in February:
10mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.2mph - Average wind speed in May:
8.6mph - Average wind speed in June:
8mph
- Average wind speed in July:
6.7mph - Average wind speed in August:
6.8mph - Average wind speed in September:
8mph - Average wind speed in October:
9mph - Average wind speed in November:
9.8mph - Average wind speed in December:
9.5mph
The windiest month (with the highest average wind speed) is March (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.7mph).
Average humidity
Siam, IA
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is October (69%).
Average rainfall
Siam, IA
- Average rainfall in January:
0.51" - Average rainfall in February:
0.43" - Average rainfall in March:
1.06" - Average rainfall in April:
1.42" - Average rainfall in May:
3.15" - Average rainfall in June:
3.39"
- Average rainfall in July:
2.17" - Average rainfall in August:
2.13" - Average rainfall in September:
1.34" - Average rainfall in October:
1.38" - Average rainfall in November:
0.83" - Average rainfall in December:
0.59"
The wettest month (with the highest rainfall) is June (3.39").
The driest month (with the least rainfall) is February (0.43").
Average rainfall days
Siam, IA
- Average rainfall days in January:
3.8 days - Average rainfall days in February:
3.4 days - Average rainfall days in March:
9.4 days - Average rainfall days in April:
12.4 days - Average rainfall days in May:
16.7 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
13.3 days - Average rainfall days in August:
12.6 days - Average rainfall days in September:
10.1 days - Average rainfall days in October:
8.6 days - Average rainfall days in November:
5.5 days - Average rainfall days in December:
4.3 days
The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is February (3.4 days).
Average snowfall
Siam, IA
The month with the highest snowfall is January (2.17").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Siam, IA
- Average snowfall days in January:
7.8 days - Average snowfall days in February:
6.9 days - Average snowfall days in March:
3.3 days - Average snowfall days in April:
1 days - Average snowfall days in May:
0.1 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:
0.5 days - Average snowfall days in November:
1.1 days - Average snowfall days in December:
4.5 days
The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Siam, IA
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 3min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h and 4min - Average sunshine in February:
5h and 3min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 2min - Average sunshine in May:
8h and 4min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
10h and 0min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 5min - Average sunshine in December:
5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days
Siam, IA
- Average sunshine days in January:
21.1 days - Average sunshine days in February:
18.8 days - Average sunshine days in March:
17.8 days - Average sunshine days in April:
15 days - Average sunshine days in May:
12.7 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
14.2 days - Average sunshine days in August:
15 days - Average sunshine days in September:
17.5 days - Average sunshine days in October:
20.2 days - Average sunshine days in November:
22.5 days - Average sunshine days in December:
22 days
The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is June (12.3 days).
Average UV index
Siam, IA
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, November and December (UV index 2).
Average cloud cover
Siam, IA
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility
Siam, IA
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).
Siam, Iowa, USA
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