Climate and monthly weather forecast
Saint Peters, PA

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Weather in January

January, like December, in Saint Peters, Pennsylvania, is an icy winter month, with an average temperature varying between 35.2°F (1.8°C) and 22.8°F (-5.1°C). January, characterized by an average high temperature of 35.2°F (1.8°C) and a low temperature of 22.8°F (-5.1°C), is generally the coldest month. Weather in January »

Weather in February

February, the last month of the winter in Saint Peters, is another cold month, with an average temperature fluctuating between 24.6°F (-4.1°C) and 38.8°F (3.8°C). Saint Peters starts February with an average high-temperature of a still icy 38.8°F (3.8°C), hinting at a minimal fluctuation from January. Weather in February »

Weather in March

March, the first month of the spring in Saint Peters, is a frosty month, with an average temperature fluctuating between 47.1°F (8.4°C) and 32°F (0°C). As March begins, there's a slight increase in the average high-temperature, moving from an icy 38.8°F (3.8°C) in February to a chilly 47.1°F (8.4°C). Weather in March »

Weather in April

April is a mild spring month in Saint Peters, Pennsylvania, with an average temperature fluctuating between 42.1°F (5.6°C) and 59.7°F (15.4°C). April signals a shift in the average high-temperature, moving from March's frosty 47.1°F (8.4°C) to a mild 59.7°F (15.4°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Saint Peters, Pennsylvania, with temperature in the range of an average low of 51.8°F (11°C) and an average high of 70.5°F (21.4°C). The onset of May brings a temperature shift, with the average high-temperature moving from a mild 59.7°F (15.4°C) in April to a pleasant 70.5°F (21.4°C). Weather in May »

Weather in June

June, the first month of the summer in Saint Peters, is a moderately hot month, with an average temperature ranging between min 59.4°F (15.2°C) and max 78.1°F (25.6°C). The shift from May to June sees a slight increase in the average high-temperature, transitioning from an agreeable 70.5°F (21.4°C) to a moderately hot 78.1°F (25.6°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Saint Peters, Pennsylvania, with an average temperature varying between 83.7°F (28.7°C) and 64.2°F (17.9°C). The temperatures reach their highest averages in July, with highs of 83.7°F (28.7°C) and lows of 64.2°F (17.9°C). The heat index for July is estimated at a hot 91.4°F (33°C). Weather in July »

Weather in August

August, the last month of the summer in Saint Peters, is another warm month, with an average temperature ranging between max 81.1°F (27.3°C) and min 63°F (17.2°C). August registers an average high-temperature of a still moderately hot 81.1°F (27.3°C), slightly varied from July's 83.7°F (28.7°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Saint Peters, Pennsylvania, with an average temperature varying between 75°F (23.9°C) and 56.5°F (13.6°C). The advent of September brings a subtle shift in temperature, with the average high moving from 81.1°F (27.3°C) in August to a still moderately hot 75°F (23.9°C). Weather in September »

Weather in October

October, like September, in Saint Peters, Pennsylvania, is another refreshing autumn month, with an average temperature ranging between max 63°F (17.2°C) and min 46.9°F (8.3°C). During the transition into October, Saint Peters observes a decrease in the average high-temperature, falling from a warm 75°F (23.9°C) in September to a comfortable 63°F (17.2°C). Weather in October »

Weather in November

November, the last month of the autumn in Saint Peters, is another cool month, with temperature in the range of an average high of 50.4°F (10.2°C) and an average low of 36°F (2.2°C). November's arrival correlates with a reduction in the average high-temperature, down from a comfortable 63°F (17.2°C) in October to a cool 50.4°F (10.2°C). Weather in November »

Weather in December

December, the first month of the winter in Saint Peters, is still a cold month, with temperature in the range of an average high of 41.4°F (5.2°C) and an average low of 30°F (-1.1°C). The onset of December aligns with a soft reduction in the average high-temperature, gently falling from a fresh 50.4°F (10.2°C) in November to a wintry 41.4°F (5.2°C). Weather in December »

Frequently asked questions

What time of the year is the coldest?

Saint Peters's January weather reaches an average high of 35.2°F (1.8°C) and an average low of 22.8°F (-5.1°C), making it the coldest month.

How many days does it rain?

In Saint Peters, during the entire year, the rain falls for 162.2 days and collects up to 27.87" (708mm) of precipitation.

When does it snow?

January through May, October through December are months with snowfall.

How many days does it snow?

Throughout the year, there are 22.9 snowfall days, and 10.35" (263mm) of snow is accumulated.

What is the month with the lowest UV index?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the most humid month?

February and October, with an average relative humidity of 81%, are most humid months.

What is the month with the least sunshine?

With an average of 4.7h of sunshine, February has the least sunshine of the year.

When does it snow the most?

March is the month with the most snowfall. Snow falls for 4.3 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 EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month in Saint Peters?

April is the least humid month, with an average relative humidity of 76%.

When is the highest UV index?

May through July, with an average maximum UV index of 6, are months with the highest UV index.

When it does not snow?

In Saint Peters, snow does not fall in June through September.

When are the longest days?

With an average of 15h and 0min of daylight, June has the longest days of the year.

What are the warmest months?

In Saint Peters, the average highest temperatures are observed in July, with a high of 83.7°F (28.7°C) and a low of 64.2°F (17.9°C).

What month has the most sunshine?

The month with the most sunshine is July, with an average of 10.6h of sunshine.

What is the wettest month?

August is the month with the most rainfall. Rain falls for 15.3 days and accumulates 2.83" (72mm) of precipitation.

What is the driest month?

The month with the least rainfall in Saint Peters is September, when the rain falls for 12.9 days and typically collects 1.77" (45mm) of precipitation.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

Average temperature
Saint Peters, PA

Average temperature - Saint Peters, PA

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (35.2°F).

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (22.8°F).

Average pressure
Saint Peters, PA

Average pressure - Saint Peters, PA

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed
Saint Peters, PA

Average wind speed - Saint Peters, PA

The windiest months (with the highest average wind speed) are January and March (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity
Saint Peters, PA

Average humidity - Saint Peters, PA

The months with the highest relative humidity are February and October (81%).
The month with the lowest relative humidity is April (76%).

Average rainfall
Saint Peters, PA

Average rainfall - Saint Peters, PA

The wettest month (with the highest rainfall) is August (2.83").
The driest month (with the least rainfall) is September (1.77").

Average rainfall days
Saint Peters, PA

Average rainfall days - Saint Peters, PA

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (9.4 days).

Average snowfall
Saint Peters, PA

Average snowfall - Saint Peters, PA

The month with the highest snowfall is March (3.03").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Saint Peters, PA

Average snowfall days - Saint Peters, PA

The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine
Saint Peters, PA

Average daylight / Average sunshine - Saint Peters, PA

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 24min).

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days
Saint Peters, PA

Average sunshine days - Saint Peters, PA

The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is May (11.6 days).

Average UV index
Saint Peters, PA

Average UV index - Saint Peters, PA

The months with the highest UV index are May, June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average visibility
Saint Peters, PA

Average visibility - Saint Peters, PA

The months with the highest visibility are January, March, April, June, July, August, November and December (6mi).
The months with the lowest visibility are February, May, September and October (5mi).

Saint Peters, Pennsylvania, USA

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