Climate and monthly weather forecastOld Saint Louis, IN
Climate and monthly weather forecast
Weather in January
January, like December, in Old Saint Louis, Indiana, is another cold winter month, with an average temperature varying between 35.2°F (1.8°C) and 22.5°F (-5.3°C). The month of January, characterized by an average high of 35.2°F (1.8°C) and a low of 22.5°F (-5.3°C), is recognized as the coldest. Weather in January »Weather in February
The last month of the winter, February, is another cold month in Old Saint Louis, Indiana, with an average temperature ranging between min 26.1°F (-3.3°C) and max 39.9°F (4.4°C). February brings an average high-temperature of a still cold 39.9°F (4.4°C), nearly identical to the preceding month. Weather in February »Weather in March
The first month of the spring, March, is a fresh month in Old Saint Louis, Indiana, with an average temperature varying between 35.6°F (2°C) and 51.1°F (10.6°C). March's arrival sees a rise in the average high-temperature, jumping from February's cold 39.9°F (4.4°C) to a fresh 51.1°F (10.6°C). Weather in March »Weather in April
April is a refreshing spring month in Old Saint Louis, Indiana, with temperature in the range of an average low of 45.9°F (7.7°C) and an average high of 63.1°F (17.3°C). The shift from March to April brings an increase in the average high-temperature, moving from a fresh 51.1°F (10.6°C) to an enjoyable 63.1°F (17.3°C). Weather in April »Weather in May
May, the last month of the spring in Old Saint Louis, is a pleasant month, with an average temperature fluctuating between 55.9°F (13.3°C) and 73°F (22.8°C). In May, the average high-temperature increases from an enjoyable 63.1°F (17.3°C) in April to an agreeable 73°F (22.8°C). Weather in May »Weather in June
June, the first month of the summer in Old Saint Louis, is a moderately hot month, with temperature in the range of an average low of 63.3°F (17.4°C) and an average high of 81.1°F (27.3°C). The coming of June brings a minor shift in Old Saint Louis's weather, with average high-temperatures adjusting from May's pleasant 73°F (22.8°C) to a moderately hot 81.1°F (27.3°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Old Saint Louis, Indiana, with temperature in the range of an average high of 83.3°F (28.5°C) and an average low of 65.5°F (18.6°C). July registers as the month with the highest average temperatures, reaching 83.3°F (28.5°C) at its peak and 65.5°F (18.6°C) at the lowest. In July, the heat index is calculated to be a hot 93.2°F (34°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Old Saint Louis, Indiana, with an average temperature fluctuating between 63.3°F (17.4°C) and 82.8°F (28.2°C). Old Saint Louis commences August with an average high-temperature of a still moderately hot 82.8°F (28.2°C), maintaining a close resemblance to the previous month. Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Old Saint Louis, Indiana, with an average temperature fluctuating between 58.3°F (14.6°C) and 77°F (25°C). September sees a slight reduction in average high-temperature, with a shift from 82.8°F (28.2°C) in August to a still warm 77°F (25°C). Weather in September »Weather in October
October, the same as September, is another refreshing autumn month in Old Saint Louis, Indiana, with an average temperature ranging between min 47.3°F (8.5°C) and max 64.6°F (18.1°C). October indicates a shift in the average high-temperature, from September's moderately hot 77°F (25°C) to a comfortable 64.6°F (18.1°C). Weather in October »Weather in November
November, the last month of the autumn in Old Saint Louis, is also a fresh month, with an average temperature varying between 36.5°F (2.5°C) and 51.1°F (10.6°C). November indicates a shift in the average high-temperature, from October's refreshing 64.6°F (18.1°C) to a fresh 51.1°F (10.6°C). Weather in November »Weather in December
The first month of the winter, December, is also an icy month in Old Saint Louis, Indiana, with temperature in the range of an average low of 29.7°F (-1.3°C) and an average high of 40.6°F (4.8°C). December's arrival correlates with a reduction in the average high-temperature, down from a fresh 51.1°F (10.6°C) in November to a wintry 40.6°F (4.8°C). Weather in December »Updated: Feb 12, 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
Old Saint Louis notes the coldest temperatures in January, with a average high of 35.2°F (1.8°C) and a low of 22.5°F (-5.3°C).
January, February, July and December, with an average relative humidity of 81%, are most humid months in Old Saint Louis, Indiana.
Throughout the year, there are 163.5 rainfall days, and 29.29" (744mm) of precipitation is accumulated.
January through April, November and December are months with snowfall in Old Saint Louis, Indiana.
In Old Saint Louis, during the entire year, snow falls for 34.1 days and aggregates up to 8.54" (217mm) of snow.
With an average of 4.1h of sunshine, January has the least sunshine of the year in Old Saint Louis.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
February is the month with the most snowfall. Snow falls for 7.8 days and accumulates 2.17" (55mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Old Saint Louis, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
May is the month with the most rainfall. Rain falls for 18.3 days and accumulates 3.5" (89mm) of precipitation.
May through October are months without snowfall in Old Saint Louis, Indiana.
The month with the longest days in Old Saint Louis is June, with an average of 14h and 54min of daylight.
The months with the highest UV index are June through August, with an average maximum UV index of 6.
With average high and low temperatures of 83.3°F (28.5°C) and 65.5°F (18.6°C) respectively, July is Old Saint Louis's warmest month.
The month with the most sunshine is July, with an average of 10.4h of sunshine.
The month with the least rainfall in Old Saint Louis, Indiana, is September, when the rain falls for 14.1 days and typically collects 1.73" (44mm) of precipitation.
October is the least humid month in Old Saint Louis, Indiana, with an average relative humidity of 74%.
The month with the shortest days is December, with an average of 9h and 30min of daylight.
Average temperature
Old Saint Louis, IN
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (35.2°F).
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure
Old Saint Louis, IN
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Old Saint Louis, IN
- Average wind speed in January:
8.9mph - Average wind speed in February:
8.9mph - Average wind speed in March:
8.6mph - Average wind speed in April:
8.7mph - Average wind speed in May:
7.1mph - Average wind speed in June:
6.3mph
- Average wind speed in July:
5.3mph - Average wind speed in August:
5.3mph - Average wind speed in September:
5.9mph - Average wind speed in October:
7.5mph - Average wind speed in November:
7.9mph - Average wind speed in December:
8.2mph
The windiest months (with the highest average wind speed) are January and February (8.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity
Old Saint Louis, IN
The months with the highest relative humidity are January, February, July and December (81%).
The month with the lowest relative humidity is October (74%).
Average rainfall
Old Saint Louis, IN
- Average rainfall in January:
2.09" - Average rainfall in February:
2.05" - Average rainfall in March:
2.6" - Average rainfall in April:
3.23" - Average rainfall in May:
3.5" - Average rainfall in June:
2.6"
- Average rainfall in July:
2.83" - Average rainfall in August:
2.05" - Average rainfall in September:
1.73" - Average rainfall in October:
2.24" - Average rainfall in November:
2.13" - Average rainfall in December:
2.24"
The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days
Old Saint Louis, IN
- Average rainfall days in January:
9.4 days - Average rainfall days in February:
9.4 days - Average rainfall days in March:
14.6 days - Average rainfall days in April:
16 days - Average rainfall days in May:
18.3 days - Average rainfall days in June:
16.7 days
- Average rainfall days in July:
16.7 days - Average rainfall days in August:
14.6 days - Average rainfall days in September:
14.1 days - Average rainfall days in October:
11.6 days - Average rainfall days in November:
10.4 days - Average rainfall days in December:
11.7 days
The month with the highest number of rainy days is May (18.3 days).
The months with the least rainy days are January and February (9.4 days).
Average snowfall
Old Saint Louis, IN
The month with the highest snowfall is February (2.17").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Old Saint Louis, IN
- Average snowfall days in January:
9.6 days - Average snowfall days in February:
7.8 days - Average snowfall days in March:
5 days - Average snowfall days in April:
0.8 days - Average snowfall days in May:
0 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:
0.2 days - Average snowfall days in November:
2.5 days - Average snowfall days in December:
8.2 days
The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Old Saint Louis, IN
- Average daylight in January:
9h and 48min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 24min - Average daylight in June:
14h and 54min
- Average daylight in July:
14h and 36min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 30min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
4h and 6min - Average sunshine in February:
5h and 18min - Average sunshine in March:
6h and 12min - Average sunshine in April:
7h and 24min - Average sunshine in May:
8h and 48min - Average sunshine in June:
10h and 12min
- Average sunshine in July:
10h and 24min - Average sunshine in August:
9h and 36min - Average sunshine in September:
8h and 24min - Average sunshine in October:
6h and 54min - Average sunshine in November:
5h and 24min - Average sunshine in December:
4h and 18min
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 6min).
Average sunshine days
Old Saint Louis, IN
- Average sunshine days in January:
13.5 days - Average sunshine days in February:
12.5 days - Average sunshine days in March:
12.2 days - Average sunshine days in April:
11.8 days - Average sunshine days in May:
10.3 days - Average sunshine days in June:
10.6 days
- Average sunshine days in July:
11.3 days - Average sunshine days in August:
13.6 days - Average sunshine days in September:
13.8 days - Average sunshine days in October:
17.7 days - Average sunshine days in November:
16.9 days - Average sunshine days in December:
13.6 days
The month with the most sunshine days is October (17.7 days).
The month with the least sunshine days is May (10.3 days).
Average UV index
Old Saint Louis, IN
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
Old Saint Louis, IN
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility
Old Saint Louis, IN
The months with the highest visibility are January, February, March, April, May, June, August, September, October and November (6mi).
The months with the lowest visibility are July and December (5mi).
