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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 Saint Marys, Iowa, with temperature in the range of an average high of 28.8°F (-1.8°C) and an average low of 15.3°F (-9.3°C). January stands out as Saint Marys's coldest month, with temperatures ranging between an average high of 28.8°F (-1.8°C) and a low of 15.3°F (-9.3°C). Weather in January »
Weather in February
February, the last month of the winter in Saint Marys, is a wintry month, with an average temperature varying between 18.5°F (-7.5°C) and 32.5°F (0.3°C). The advent of February sees the average high-temperature at an icy 32.5°F (0.3°C), subtly shifted from January's 28.8°F (-1.8°C). Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Saint Marys, Iowa, with an average temperature ranging between max 47.8°F (8.8°C) and min 32.5°F (0.3°C). The start of March signals a considerable escalation in the average high-temperature, advancing from an icy 32.5°F (0.3°C) in February to a frosty 47.8°F (8.8°C). Weather in March »
Weather in April
April in Saint Marys, Iowa, is a moderate spring month, with an average temperature fluctuating between 59.9°F (15.5°C) and 42.4°F (5.8°C). Saint Marys sees an increase in the average high-temperature with the arrival of April, moving from March's frosty 47.8°F (8.8°C) to a moderate 59.9°F (15.5°C). Weather in April »
Weather in May
May, the last month of the spring in Saint Marys, is a pleasant month, with an average temperature ranging between min 52.9°F (11.6°C) and max 69.6°F (20.9°C). In Saint Marys, the average high-temperature in May rises, from a refreshing 59.9°F (15.5°C) in April, to a pleasant 69.6°F (20.9°C). Weather in May »
Weather in June
June, the first month of the summer in Saint Marys, is a warm month, with an average temperature fluctuating between 79.7°F (26.5°C) and 63.1°F (17.3°C). As Saint Marys enters June, the average high-temperature increases from the an agreeable 69.6°F (20.9°C) of May to a warm 79.7°F (26.5°C). Weather in June »
Weather in July
July, like June, in Saint Marys, Iowa, is a moderately hot summer month, with an average temperature fluctuating between 65.7°F (18.7°C) and 83.1°F (28.4°C). July is the month when Saint Marys's temperatures reach their peak, with averages of 83.1°F (28.4°C) and lows of 65.7°F (18.7°C). The heat index value during July is appraised at a tropical 91.4°F (33°C). Weather in July »
Weather in August
August, the last month of the summer in Saint Marys, is another warm month, with an average temperature ranging between min 62.6°F (17°C) and max 81.3°F (27.4°C). The arrival of August brings an average high-temperature of a still warm 81.3°F (27.4°C), nearly identical to July's 83.1°F (28.4°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Saint Marys, Iowa, with temperature in the range of an average high of 75.7°F (24.3°C) and an average low of 55.9°F (13.3°C). The start of September involves a subtle temperature drop, shifting from 81.3°F (27.4°C) in August to a still warm 75.7°F (24.3°C). Weather in September »
Weather in October
October, the same as September, is another enjoyable autumn month in Saint Marys, Iowa, with temperature in the range of an average high of 60.8°F (16°C) and an average low of 44.6°F (7°C). Saint Marys's weather undergoes a significant change with the arrival of October, as the average high-temperature drops from a moderately hot 75.7°F (24.3°C) in September to a comfortable 60.8°F (16°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Saint Marys, Iowa, with an average temperature varying between 32.7°F (0.4°C) and 47.5°F (8.6°C). In Saint Marys, entering November brings a temperature decrement, reducing from October's enjoyable 60.8°F (16°C) to a chilly 47.5°F (8.6°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Saint Marys, Iowa, with temperature in the range of an average high of 34.7°F (1.5°C) and an average low of 22.8°F (-5.1°C). Saint Marys's average high-temperature decreases in December, falling from a frosty 47.5°F (8.6°C) in November to a wintry 34.7°F (1.5°C). Weather in December »
Updated: Jul 17, 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 part of the year is the coldest?
January, marked by an average high-temperature of 28.8°F (-1.8°C) and a low-temperature of 15.3°F (-9.3°C), is the coldest month.
What is the most humid month?
The months with the highest humidity in Saint Marys are January and June, with an average relative humidity of 82%.
How many days does it rain?
In Saint Marys, during the entire year, the rain falls for 118.9 days and collects up to 18.62" (473mm) of precipitation.
When does it snow?
January through May, October through December are months with snowfall.
How much does it snow?
Throughout the year, there are 31.9 snowfall days, and 10.12" (257mm) of snow is accumulated.
What is the month with the least sunshine?
With an average of 4.3h of sunshine, January has the least sunshine of the year.
When is the lowest UV index?
January is the month with the lowest UV index, with an average maximum UV index of 1.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 8.2 days and accumulates 3.03" (77mm) 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.
What is the rainiest month?
May is the month with the most rainfall. Rain falls for 15.9 days and accumulates 3.07" (78mm) of precipitation.
When it does not snow?
June through September are months without snowfall.
When are the longest days?
June has the longest days of the year, with an average of 15h and 6min of daylight.
What is the month with the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What is the warmest month?
July, with its high-temperature average of 83.1°F (28.4°C) and a low-temperature average of 65.7°F (18.7°C), is the warmest month.
What month has the most sunshine?
July has the most sunshine of the year, with an average of 10.4h of sunshine.
What is the least humid month?
The least humid month in Saint Marys is October, with an average relative humidity of 71%.
What is the driest month?
December is the month with the least rainfall. Rain falls for 4.7 days and accumulates 0.55" (14mm) of precipitation.
What is the month with the shortest days?
With an average of 9h and 18min of daylight, December has the shortest days of the year in Saint Marys.
Average temperature
Saint Marys, IA
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (28.8°F).
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure
Saint Marys, IA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.92"Hg - Average pressure in May:
29.93"Hg - Average pressure in June:
29.89"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed
Saint Marys, IA
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.3mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.3mph - Average wind speed in May:
8.8mph - Average wind speed in June:
8mph
- Average wind speed in July:
7mph - Average wind speed in August:
6.9mph - Average wind speed in September:
8mph - Average wind speed in October:
9.4mph - Average wind speed in November:
10.2mph - Average wind speed in December:
9.9mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity
Saint Marys, IA
The months with the highest relative humidity are January and June (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Saint Marys, IA
- Average rainfall in January:
0.63" - Average rainfall in February:
0.67" - Average rainfall in March:
1.22" - Average rainfall in April:
1.81" - Average rainfall in May:
3.07" - Average rainfall in June:
2.99"
- Average rainfall in July:
1.85" - Average rainfall in August:
2.01" - Average rainfall in September:
1.81" - Average rainfall in October:
1.1" - Average rainfall in November:
0.91" - Average rainfall in December:
0.55"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is December (0.55").
Average rainfall days
Saint Marys, IA
- Average rainfall days in January:
3.4 days - Average rainfall days in February:
3.8 days - Average rainfall days in March:
9.5 days - Average rainfall days in April:
13 days - Average rainfall days in May:
15.9 days - Average rainfall days in June:
15.9 days
- Average rainfall days in July:
14.3 days - Average rainfall days in August:
12.8 days - Average rainfall days in September:
11.1 days - Average rainfall days in October:
8.5 days - Average rainfall days in November:
6 days - Average rainfall days in December:
4.7 days
The months with the highest number of rainy days are May and June (15.9 days).
The month with the least rainy days is January (3.4 days).
Average snowfall
Saint Marys, IA
- Average snowfall in January:
2.99" - Average snowfall in February:
3.03" - Average snowfall in March:
1.42" - Average snowfall in April:
0.63" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is February (3.03").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Saint Marys, IA
- Average snowfall days in January:
9.7 days - Average snowfall days in February:
8.2 days - Average snowfall days in March:
4.6 days - Average snowfall days in April:
0.9 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:
0.6 days - Average snowfall days in November:
2.1 days - Average snowfall days in December:
5.7 days
The month with the highest number of snowfall days is January (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Saint Marys, 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 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - 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 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h and 2min - Average sunshine in February:
4h and 5min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 1min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 4min - Average sunshine in December:
4h and 5min
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 18min).
Average sunshine days
Saint Marys, IA
- Average sunshine days in January:
19.5 days - Average sunshine days in February:
17.3 days - Average sunshine days in March:
16.6 days - Average sunshine days in April:
14.7 days - Average sunshine days in May:
12.1 days - Average sunshine days in June:
11 days
- Average sunshine days in July:
13.2 days - Average sunshine days in August:
15.3 days - Average sunshine days in September:
17 days - Average sunshine days in October:
19.6 days - Average sunshine days in November:
21.4 days - Average sunshine days in December:
21.9 days
The month with the most sunshine days is December (21.9 days).
The month with the least sunshine days is June (11 days).
Average UV index
Saint Marys, IA
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Saint Marys, IA
The month with the most cloud cover is January (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility
Saint Marys, 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).
Saint Marys, Iowa, USA
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