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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, like December, is a freezing cold winter month in Castalia, Iowa, with an average temperature ranging between max 22.5°F (-5.3°C) and min 9.9°F (-12.3°C). Castalia's coldest weather arrives in January, when temperatures average a high of 22.5°F (-5.3°C) and a low of 9.9°F (-12.3°C). Weather in January »
Weather in February
The last month of the winter, February, is another freezing cold month in Castalia, Iowa, with an average temperature varying between 26.2°F (-3.2°C) and 13.1°F (-10.5°C). February reports an average high-temperature of a still freezing cold 26.2°F (-3.2°C), slightly varied from January's 22.5°F (-5.3°C). Weather in February »
Weather in March
March, the first month of the spring in Castalia, is a wintry month, with an average temperature varying between 41.4°F (5.2°C) and 27°F (-2.8°C). March's arrival sees a clear escalation in the average high-temperature, rising from February's freezing cold 26.2°F (-3.2°C) to a cold 41.4°F (5.2°C). Weather in March »
Weather in April
April is a fresh spring month in Castalia, Iowa, with temperature in the range of an average low of 37.9°F (3.3°C) and an average high of 54.3°F (12.4°C). With the onset of April, Castalia's weather sees a temperature rise, transitioning from a wintry 41.4°F (5.2°C) in March to a fresh 54.3°F (12.4°C). Weather in April »
Weather in May
May, the last month of the spring in Castalia, is an enjoyable month, with temperature in the range of an average low of 48.9°F (9.4°C) and an average high of 65.8°F (18.8°C). The transition from April to May brings a temperature rise, with average high-temperatures increasing from a fresh 54.3°F (12.4°C) to an enjoyable 65.8°F (18.8°C). Weather in May »
Weather in June
June, the first month of the summer in Castalia, is a warm month, with temperature in the range of an average low of 58.6°F (14.8°C) and an average high of 75.4°F (24.1°C). Castalia's weather shows a temperature rise with the arrival of June, moving from an enjoyable 65.8°F (18.8°C) in May to a warm 75.4°F (24.1°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Castalia, Iowa, with an average temperature fluctuating between 62.2°F (16.8°C) and 79°F (26.1°C). Castalia's warmest weather arrives in July, when temperatures average a high of 79°F (26.1°C) and a low of 62.2°F (16.8°C). Weather in July »
Weather in August
August, the last month of the summer in Castalia, is another warm month, with an average temperature fluctuating between 59.5°F (15.3°C) and 77.5°F (25.3°C). August's presence records an average high-temperature of a still moderately hot 77.5°F (25.3°C), closely mirroring July's climate. Weather in August »
Weather in September
The first month of the autumn, September, is still a pleasant month in Castalia, Iowa, with an average temperature ranging between max 71.1°F (21.7°C) and min 52.3°F (11.3°C). During the shift to September, Castalia records a mild decrease in average high-temperature, moving from a moderately hot 77.5°F (25.3°C) in August to a pleasant 71.1°F (21.7°C). Weather in September »
Weather in October
October, like September, is another refreshing autumn month in Castalia, Iowa, with an average temperature varying between 41.4°F (5.2°C) and 57°F (13.9°C). During the transition into October, Castalia observes a decrease in the average high-temperature, falling from a pleasant 71.1°F (21.7°C) in September to a moderate 57°F (13.9°C). Weather in October »
Weather in November
The last month of the autumn, November, is another cold month in Castalia, Iowa, with an average temperature varying between 42.6°F (5.9°C) and 29.5°F (-1.4°C). November is marked by a distinct decrease in the average high-temperature, falling from a moderate 57°F (13.9°C) in October to a cold 42.6°F (5.9°C). Weather in November »
Weather in December
December, the first month of the winter in Castalia, is also a subzero cold month, with an average temperature fluctuating between 28.9°F (-1.7°C) and 18.7°F (-7.4°C). As November shifts into December, a slight alteration in temperatures is observed, with average highs reducing from a wintry 42.6°F (5.9°C) to a freezing cold 28.9°F (-1.7°C). Weather in December »
[Resources]Frequently asked questions
What month is the coldest in Castalia?
January tends to be the coldest month in Castalia, with temperatures averaging a daily high of 22.5°F (-5.3°C) and a low of 9.9°F (-12.3°C).
What is the most humid month in Castalia?
With an average relative humidity of 89%, January is the most humid month in Castalia.
What is the driest month in Castalia?
January is the month with the least rainfall in Castalia, Iowa. Rain falls for 4 days and accumulates 0.98" (25mm) of precipitation.
How many days does it rain in Castalia?
Throughout the year, in Castalia, Iowa, there are 131 rainfall days, and 27.91" (709mm) of precipitation is accumulated.
When does it snow in Castalia?
Months with snowfall in Castalia, Iowa, are January through May, October through December.
How much does it snow in Castalia?
Throughout the year, there are 52.3 snowfall days, and 21.26" (540mm) of snow is accumulated.
What is the month with the least sunshine in Castalia?
With an average of 3.5h of sunshine, January has the least sunshine of the year.
What is the month with the lowest UV index in Castalia?
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index.
What is the snowiest month in Castalia?
February is the month with the most snowfall in Castalia. Snow falls for 10.3 days and accumulates 5.16" (131mm) of snow.
When is Daylight Saving Time (DST) in Castalia?
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.
What is the rainiest month in Castalia?
The month with the most rainfall in Castalia, Iowa, is June, when the rain falls for 17.7 days and typically aggregates up to 4.33" (110mm) of precipitation.
When it does not snow in Castalia?
June through September are months without snowfall.
When are the longest days in Castalia?
The month with the longest days in Castalia is June, with an average of 15h and 18min of daylight.
What are the warmest months in Castalia?
With average high temperatures of 79°F (26.1°C) and lows of 62.2°F (16.8°C), July is the warmest month.
When is the highest UV index in Castalia?
July is the month with the highest UV index in Castalia, Iowa, with an average maximum UV index of 6.
What month has the most sunshine in Castalia?
With an average of 9.8h of sunshine, August has the most sunshine of the year.
What is the least humid month in Castalia?
The least humid month is October, with an average relative humidity of 75%.
What is the month with the shortest days in Castalia?
December has the shortest days of the year, with an average of 9h and 6min of daylight.
Average temperature
Castalia, IA
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (22.5°F).
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (9.9°F).
Average pressure
Castalia, IA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.89"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed
Castalia, IA
- Average wind speed in January:
10.2mph - Average wind speed in February:
10.1mph - Average wind speed in March:
10mph - Average wind speed in April:
10.5mph - Average wind speed in May:
9mph - Average wind speed in June:
7.9mph
The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity
Castalia, IA
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (75%).
Average rainfall
Castalia, IA
- Average rainfall in January:
0.98" - Average rainfall in February:
1.14" - Average rainfall in March:
1.69" - Average rainfall in April:
3.19" - Average rainfall in May:
3.78" - Average rainfall in June:
4.33"
- Average rainfall in July:
2.91" - Average rainfall in August:
2.01" - Average rainfall in September:
2.44" - Average rainfall in October:
2.52" - Average rainfall in November:
1.5" - Average rainfall in December:
1.42"
The wettest month (with the highest rainfall) is June (4.33").
The driest month (with the least rainfall) is January (0.98").
Average rainfall days
Castalia, IA
- Average rainfall days in January:
4 days - Average rainfall days in February:
3.8 days - Average rainfall days in March:
10.1 days - Average rainfall days in April:
15.3 days - Average rainfall days in May:
17.3 days - Average rainfall days in June:
17.7 days
- Average rainfall days in July:
14.6 days - Average rainfall days in August:
12.3 days - Average rainfall days in September:
10.7 days - Average rainfall days in October:
11.6 days - Average rainfall days in November:
8.2 days - Average rainfall days in December:
5.4 days
The month with the highest number of rainy days is June (17.7 days).
The month with the least rainy days is February (3.8 days).
Average snowfall
Castalia, IA
The month with the highest snowfall is February (5.16").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Castalia, IA
- Average snowfall days in January:
13.3 days - Average snowfall days in February:
10.3 days - Average snowfall days in March:
7 days - Average snowfall days in April:
3 days - Average snowfall days in May:
0.3 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:
1.4 days - Average snowfall days in November:
5.1 days - Average snowfall days in December:
11.9 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Castalia, IA
- Average daylight in January:
9h and 2min - 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 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 4min - Average daylight in December:
9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
3h and 3min - Average sunshine in February:
3h and 4min - Average sunshine in March:
5h and 4min - Average sunshine in April:
7h and 2min - Average sunshine in May:
8h and 1min - Average sunshine in June:
9h and 1min
- Average sunshine in July:
9h and 4min - Average sunshine in August:
9h and 5min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 1min - Average sunshine in November:
5h and 0min - Average sunshine in December:
4h and 0min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days
Castalia, IA
- Average sunshine days in January:
15.3 days - Average sunshine days in February:
15.3 days - Average sunshine days in March:
15.4 days - Average sunshine days in April:
11.5 days - Average sunshine days in May:
12.3 days - Average sunshine days in June:
10.5 days
- Average sunshine days in July:
12.8 days - Average sunshine days in August:
16.4 days - Average sunshine days in September:
17 days - Average sunshine days in October:
16.6 days - Average sunshine days in November:
16.9 days - Average sunshine days in December:
16.8 days
The month with the most sunshine days is September (17 days).
The month with the least sunshine days is June (10.5 days).
Average UV index
Castalia, IA
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover
Castalia, IA
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility
Castalia, IA
The months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and July (5mi).
Castalia, Iowa, USA
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