Climate and monthly weather forecastMonmouth, IL
Climate and monthly weather forecast
Weather in January
January, the same as December, in Monmouth, Illinois, is another subzero cold winter month, with temperature in the range of an average high of 29.7°F (-1.3°C) and an average low of 17.6°F (-8°C). The coldest temperatures occur during January, when averages reach a peak of 29.7°F (-1.3°C) and a low of 17.6°F (-8°C). Weather in January »Weather in February
The last month of the winter, February, is a cold month in Monmouth, Illinois, with temperature in the range of an average low of 21.6°F (-5.8°C) and an average high of 34.9°F (1.6°C). Monmouth registers an average high-temperature of a wintry 34.9°F (1.6°C) at the commencement of February, closely related to the preceding month. Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Monmouth, Illinois, with an average temperature varying between 48°F (8.9°C) and 33.3°F (0.7°C). March sees a rise in the average high-temperature, climbing from a wintry 34.9°F (1.6°C) in February to a frosty 48°F (8.9°C). Weather in March »Weather in April
April is a mild spring month in Monmouth, Illinois, with temperature in the range of an average low of 43.3°F (6.3°C) and an average high of 60.4°F (15.8°C). Observing a rise in April, the average high-temperature goes from March's frosty 48°F (8.9°C) to a refreshing 60.4°F (15.8°C). Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Monmouth, Illinois, with temperature in the range of an average high of 70.9°F (21.6°C) and an average low of 54.1°F (12.3°C). As Monmouth, Illinois, enters May, the average high-temperature increases from the a refreshing 60.4°F (15.8°C) of April to a pleasant 70.9°F (21.6°C). Weather in May »Weather in June
June, the first month of the summer in Monmouth, is a moderately hot month, with temperature in the range of an average high of 79.5°F (26.4°C) and an average low of 63.1°F (17.3°C). With the onset of June, Monmouth's average high-temperature sees a modest rise, moving from May's pleasant 70.9°F (21.6°C) to a moderately hot 79.5°F (26.4°C). Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in Monmouth, Illinois, with an average temperature ranging between min 64.9°F (18.3°C) and max 82°F (27.8°C). July is the warmest month, exhibiting average temperatures of 82°F (27.8°C) at the peak and 64.9°F (18.3°C) at the base. July's heat index is computed to be a hot 89.6°F (32°C). Weather in July »Weather in August
August, the last month of the summer in Monmouth, is also a moderately hot month, with an average temperature fluctuating between 81.1°F (27.3°C) and 63.3°F (17.4°C). The shift to August signals an average high-temperature of a still warm 81.1°F (27.3°C), subtly varied from July's 82°F (27.8°C). Weather in August »Weather in September
September, the first month of the autumn in Monmouth, is also a moderately hot month, with an average temperature fluctuating between 56.3°F (13.5°C) and 75.9°F (24.4°C). In September, the average high-temperature registers at a still moderately hot 75.9°F (24.4°C), nearly identical to August's 81.1°F (27.3°C). Weather in September »Weather in October
October, like September, in Monmouth, Illinois, is another refreshing autumn month, with an average temperature ranging between max 61.7°F (16.5°C) and min 45.9°F (7.7°C). In Monmouth, the average high-temperature in October decreases from a warm 75.9°F (24.4°C) in September to an enjoyable 61.7°F (16.5°C). Weather in October »Weather in November
November, the last month of the autumn in Monmouth, is another chilly month, with an average temperature ranging between max 47.5°F (8.6°C) and min 34°F (1.1°C). November comes with a decrease in the average high-temperature, falling from an enjoyable 61.7°F (16.5°C) in October to a frosty 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 Monmouth, Illinois, with temperature in the range of an average high of 35.6°F (2°C) and an average low of 24.6°F (-4.1°C). Monmouth's December weather features a mild decline in high-temperatures, reducing from a frosty 47.5°F (8.6°C) in November to an icy 35.6°F (2°C). Weather in December »Updated: Aug 24, 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
January, characterized by an average high temperature of 29.7°F (-1.3°C) and a low temperature of 17.6°F (-8°C), is generally the coldest month.
The month with the least rainfall is January, when the rain falls for 5.9 days and typically collects 1.46" (37mm) of precipitation.
In Monmouth, during the entire year, the rain falls for 149.4 days and collects up to 30.16" (766mm) of precipitation.
Months with snowfall are January through April, October through December.
January is the month with the most snowfall. Snow falls for 10.9 days and accumulates 4.61" (117mm) of snow.
Throughout the year, there are 36.7 snowfall days, and 15.31" (389mm) of snow is accumulated.
With an average of 4.1h of sunshine, January has the least sunshine of the year.
With an average maximum UV index of 1, January is the month with the lowest UV index.
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.
May is the month with the most rainfall. Rain falls for 19 days and accumulates 4.25" (108mm) of precipitation.
May through September are months without snowfall.
June has the longest days of the year, with an average of 15h and 6min of daylight.
June has the most sunshine of the year, with an average of 10.1h of sunshine.
The months with the highest UV index are June and July, with an average maximum UV index of 6.
July, with average temperatures reaching a high of 82°F (27.8°C) and a low of 64.9°F (18.3°C), is the warmest month.
The most humid month in Monmouth is July, with an average relative humidity of 84%.
The least humid month is October, with an average relative humidity of 71%.
With an average of 9h and 18min of daylight, December has the shortest days of the year.
Average temperature
Monmouth, IL
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (29.7°F).
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).
Average pressure
Monmouth, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Monmouth, IL
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.6mph - Average wind speed in April:
10.7mph - Average wind speed in May:
9mph - Average wind speed in June:
7.9mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.8mph - Average wind speed in September:
7.8mph - Average wind speed in October:
9.5mph - Average wind speed in November:
10.3mph - Average wind speed in December:
10mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity
Monmouth, IL
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Monmouth, IL
- Average rainfall in January:
1.46" - Average rainfall in February:
1.73" - Average rainfall in March:
2.2" - Average rainfall in April:
3.35" - Average rainfall in May:
4.25" - Average rainfall in June:
3.58"
The wettest month (with the highest rainfall) is May (4.25").
The driest month (with the least rainfall) is January (1.46").
Average rainfall days
Monmouth, IL
- Average rainfall days in January:
5.9 days - Average rainfall days in February:
5.8 days - Average rainfall days in March:
13 days - Average rainfall days in April:
15.5 days - Average rainfall days in May:
19 days - Average rainfall days in June:
18.7 days
- Average rainfall days in July:
17 days - Average rainfall days in August:
14 days - Average rainfall days in September:
11.6 days - Average rainfall days in October:
11.9 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
7.5 days
The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is February (5.8 days).
Average snowfall
Monmouth, IL
The month with the highest snowfall is January (4.61").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Monmouth, IL
- Average snowfall days in January:
10.9 days - Average snowfall days in February:
9.4 days - Average snowfall days in March:
4.3 days - Average snowfall days in April:
1 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:
0.4 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 (10.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Monmouth, IL
- Average daylight in January:
9h and 36min - 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 30min - Average daylight in June:
15h and 6min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 18min
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 6min - Average sunshine in February:
4h and 12min - Average sunshine in March:
6h and 30min - Average sunshine in April:
7h and 54min - Average sunshine in May:
8h and 54min - Average sunshine in June:
10h and 6min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
9h and 48min - Average sunshine in September:
9h and 24min - Average sunshine in October:
5h and 36min - Average sunshine in November:
5h and 24min - Average sunshine in December:
4h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days
Monmouth, IL
- Average sunshine days in January:
15.8 days - Average sunshine days in February:
14.4 days - Average sunshine days in March:
14.5 days - Average sunshine days in April:
12 days - Average sunshine days in May:
9.9 days - Average sunshine days in June:
9.2 days
- Average sunshine days in July:
9.9 days - Average sunshine days in August:
13.8 days - Average sunshine days in September:
16.5 days - Average sunshine days in October:
17.6 days - Average sunshine days in November:
18 days - Average sunshine days in December:
16.6 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is June (9.2 days).
Average UV index
Monmouth, IL
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Monmouth, IL
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility
Monmouth, IL
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
