Climate and monthly weather forecastGreencastle, IN
Climate and monthly weather forecast
The climate of Greencastle
A geographical position in Indiana's central region imbues Greencastle with a humid continental climate, according to the Köppen Climate Classification system. This unique categorization, denoted as Dfa, presents the area with hot summers and no designated dry season.Throughout the year, Greencastle exhibits a remarkable range of weather conditions, underpinned by monthly variations in various climatological parameters. Notably, the temperature swings from lows of 20.8°F (-6.2°C) in January to highs of 81.7°F (27.6°C) in July, outlining the range between chilly winters and warm, lush summers. Humidity averages remain fairly consistent, hovering around 78% to 84% annually, reflecting the consistent moisture content in the atmosphere.
Rainfall, measured in inches, does not adhere to a monotone pattern; instead, it flaunts a periodic rise and decline, with May experiencing a peak in rainfall. The number of rainfall days also peaks during the spring season, falling between 12.1 days in June and 15.8 in May. Snowfall is almost absent from April to November, punctuated by an uptick from December to February, with 1.22" (31mm) of snow noticed in December.
A salient pattern emerges in the realm of daylight hours, which increase steadily from 9.7 hours in January to a peak of 14.9 hours in June, before gradually declining again. This is accompanied by a proportional increase in sunshine hours from 4.2 hours in January to 10.2 hours in June.
The best time to visit Greencastle
Given the climate and weather patterns, June through August present as the most desirable time to visit Greencastle. During these months, visitors can experience the maximum recorded temperatures ranging from 79.7°F (26.5°C) to 81.7°F (27.6°C) and enjoy up to 14.6 to 14.9 daylight hours daily, inviting exploration and outdoor activities. Additionally, sunshine hours peak at 10.2 hours in June, enhancing the allure of this time frame.The worst time to visit Greencastle
The least favored times to visit Greencastle fall between December and February. During these winter months, the temperatures drop significantly with averages from 33.6°F (0.9°C) to 38.7°F (3.7°C), and daylight hours shrink to a yearly low from 9.4hrs to 9.7hrs. Furthermore, the frequency of snowfall days spike from 5.3 days in December to 5.8 in January, making travel more challenging and limiting outdoor activities.Spring weather in Greencastle
Spring in Greencastle, encompassing March through May, exhibits a clear and gradual increase in temperatures. This period sees daytime highs starting from 50.4°F (10.2°C) in March and escalating to 71.8°F (22.1°C) in May. Concurrently, the length of daylight broadens from 12 hours in March to 14.4 hours by May's end, supporting extended outdoor explorations. However, spring also signals higher rainfall levels, peaking in May with an average of 1.5" (38mm) and spanning over 15.8 days.Summer weather in Greencastle
The heart of summer offers temperatures fluctuating between 71.8°F (22.1°C) in June and 81.7°F (27.6°C) in July. While relative humidity holds steady around a comfortable 82% to 84%, the rainfall, though diminished from the spring season, still has its presence with an average of 1.38" (35mm) in June. During summer, daylight extends up to a maximum of 14.9 hours a day, and sunshine hours reach a high of 10.2 in June.Autumn weather in Greencastle
Autumn, unfolding from September to November, witnesses a gradual decline in temperatures, starting from a summer-esque 75.9°F (24.4°C) in September and dropping to a brisk 49.3°F (9.6°C) by November. Daylight hours shorten from 12.4 hours in September to 10 hours in November. However, the frequency of rainfall days and the amount of precipitation moderately decrease, translating to the least rainy season of all, with October and November seeing 0.67" (17mm) and 0.71" (18mm) respectively.Winter weather in Greencastle
Winter imposes a cold regime on Greencastle, from December to February, with recorded lowest temperatures swinging between 20.8°F (-6.2°C) in January and 38.5°F (3.6°C) in February. Daylight hours dwindle to the yearly low of 9.4 hours in December. Furthermore, snowfall dominates, peaking at 1.22" (31mm) in December. Yet, winter also graces the area with lower rainfall. Although the days are short, there is an adequate amount of sunshine piercing through the frosty air.In Greencastle, the month of January registers the lowest temperatures, averaging 33.6°F (0.9°C) at the peak and 20.8°F (-6.2°C) at the lowest. In January, the average relative humidity is 81%. In Greencastle, in January, during 6.6 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. Throughout the year, there are 118.9 rainfall days, and 12.13" (308mm) of precipitation is accumulated. January through April, November and December are months with snowfall. In Greencastle, in January, during 5.8 snowfall days, 0.98" (25mm) of snow is typically accumulated. In Greencastle, during the entire year, snow falls for 22.2 days and aggregates up to 3.82" (97mm) of snow. The average length of the day in January is 9h and 45min.
On the first day of January, sunrise is at 8:08 am and sunset at 5:33 pm. On the last day of the month, sunrise is at 7:56 am and sunset at 6:05 pm EST. The month with the least sunshine in Greencastle is January, with an average of 4.2h of sunshine. The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the average person.
Note: The UV index of 2 during January translates into the following guidance:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Weather in February
With Febuary, Greencastle residents notice a slight increase in temperature which signals the subsiding winter. The rainfall diminishes slightly from January, and snow decreases to 0.63" (16mm), encouraging the city to stir from its hibernation. Weather in February »Weather in March
March comes to Greencastle with the promise of a warming trend. Alongside the thaw of winter, blooming flora signifies the arrival of Spring, refreshing the city's landscape. However, the emerging pleasant weather also ushers in rainy days as rainfall increases to 0.94" (24mm). Weather in March »Weather in April
Spring is in full bloom in April in Greencastle. The scenery turns picturesque with bright blossoms standing out against green meadows. While rainfall peaks at 1.42" (36mm), the increase in temperature creates a balanced combination for the city's ecosystem. Weather in April »Weather in May
As May swings in, pleasant weather envelops Greencastle with warmth seeping into the city's spine. Residents pull out summer garbs with temperatures reaching a high of 71.8°F (22.1°C). The month brings in ample daylight and longer sunshine hours, ideal for outdoor activities. Weather in May »Weather in June
Greencastle warms considerably with June. The city usually experiences its first summer heatwave during this period. However, the constant Indiana humidity at 82%, keeps the Fahrenheit in check, providing relief against increasing temperatures. Weather in June »Weather in July
July in Greencastle represents the height of summer. The sultry city highs peak in this month at a substantial 81.7°F (27.6°C). While residents engage in numerous summer activities, the increase in UV index to 6 stresses the necessity for sun protection. Weather in July »Weather in August
August represents a final burst of summer in Greencastle. While there is a slight drop in temperature from July, residents still enjoy warm weather. Rainfall drops to 0.94" (24mm), offering a semi-dry experience to the city denizens. Weather in August »Weather in September
September ushers in transitional weather in Greencastle. While warmer days persist, crisper nights hint towards the approach of the autumn season. The arrival of fall results in a reduced daytime temperature, and rainfall decreases to 0.67" (17mm). Weather in September »Weather in October
Greencastle's scenery transforms entirely in October. The tender sunlight beautifully illuminates the city's stunning fall colors, offering a picturesque spectacle. The temperatures continue to dwindle, making room for chilly mornings and evenings. Weather in October »Weather in November
November brings the first whispers of the forthcoming winter in Greencastle. The cold edges into the city, and residents brace for frosty mornings framed by breath-taking frosts. Humidity level jumps to 76%, enhancing the chill factor, especially during dawn and dusk. Weather in November »Weather in December
Winter arrives in full force in December, dressing Greencastle in a white winter blanket. The city experiences increased snowfall at 1.22" (31mm) and reintroduces snowflakes drifting through the biting chill. With cloudy skies, the sunlight is often muted, and daylight hours reduce to 9.4. Weather in December »Updated: Aug 21, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January tends to be the coldest month, with temperatures averaging a daily high of 33.6°F (0.9°C) and a low of 20.8°F (-6.2°C).
Throughout the year, there are 118.9 rainfall days, and 12.13" (308mm) of precipitation is accumulated.
Months with snowfall in Greencastle are January through April, November and December.
In Greencastle, during the entire year, snow falls for 22.2 days and aggregates up to 3.82" (97mm) of snow.
The month with the least sunshine is January, with an average of 4.2h of sunshine.
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2.
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.
May is the month with the most rainfall. Rain falls for 15.8 days and accumulates 1.5" (38mm) of precipitation.
In Greencastle, snow does not fall in May through October.
June has the longest days of the year, with an average of 14h and 54min of daylight.
June has the most sunshine of the year, with an average of 10.2h of sunshine.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
Greencastle's warmest month, July, registers temperatures that range from a high of 81.7°F (27.6°C) to a low of 65.1°F (18.4°C).
July is the most humid month in Greencastle, Indiana, with an average relative humidity of 84%.
The month with the least rainfall is September, when the rain falls for 8.5 days and typically collects 0.67" (17mm) of precipitation.
October is the least humid month, with an average relative humidity of 74%.
December is the month with the most snowfall. Snow falls for 5.3 days and accumulates 1.22" (31mm) of snow.
December has the shortest days of the year, with an average of 9h and 24min of daylight.
Average temperature
Greencastle, IN
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (33.6°F).
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).
Average pressure
Greencastle, 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:
29.95"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
Greencastle, IN
- Average wind speed in January:
9.9mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.7mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8mph - Average wind speed in June:
7mph
- Average wind speed in July:
5.9mph - Average wind speed in August:
5.9mph - Average wind speed in September:
6.6mph - Average wind speed in October:
8.5mph - Average wind speed in November:
9.1mph - Average wind speed in December:
9.1mph
The windiest months (with the highest average wind speed) are January and February (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity
Greencastle, IN
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (74%).
Average rainfall
Greencastle, IN
- Average rainfall in January:
0.87" - Average rainfall in February:
0.75" - Average rainfall in March:
0.94" - Average rainfall in April:
1.42" - Average rainfall in May:
1.5" - Average rainfall in June:
1.38"
- Average rainfall in July:
1.18" - Average rainfall in August:
0.94" - Average rainfall in September:
0.67" - Average rainfall in October:
0.83" - Average rainfall in November:
0.71" - Average rainfall in December:
0.94"
The wettest month (with the highest rainfall) is May (1.5").
The driest month (with the least rainfall) is September (0.67").
Average rainfall days
Greencastle, IN
- Average rainfall days in January:
6.6 days - Average rainfall days in February:
6.4 days - Average rainfall days in March:
10.4 days - Average rainfall days in April:
13.1 days - Average rainfall days in May:
15.8 days - Average rainfall days in June:
12.1 days
- Average rainfall days in July:
13.2 days - Average rainfall days in August:
10.2 days - Average rainfall days in September:
8.5 days - Average rainfall days in October:
8.5 days - Average rainfall days in November:
7.5 days - Average rainfall days in December:
6.6 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is February (6.4 days).
Average snowfall
Greencastle, IN
The month with the highest snowfall is December (1.22").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Greencastle, IN
- Average snowfall days in January:
5.8 days - Average snowfall days in February:
5.3 days - Average snowfall days in March:
2.8 days - Average snowfall days in April:
0.7 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 days - Average snowfall days in November:
2.2 days - Average snowfall days in December:
5.3 days
The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight / Average sunshine
Greencastle, IN
- Average daylight in January:
9h and 42min - 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 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
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 24min).
- Average sunshine in January:
4h and 12min - Average sunshine in February:
5h and 18min - Average sunshine in March:
6h and 24min - Average sunshine in April:
7h and 6min - Average sunshine in May:
8h and 36min - Average sunshine in June:
10h and 12min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
9h and 24min - Average sunshine in September:
8h and 30min - Average sunshine in October:
6h and 48min - Average sunshine in November:
5h and 18min - Average sunshine in December:
4h and 18min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days
Greencastle, IN
- Average sunshine days in January:
20.4 days - Average sunshine days in February:
17.8 days - Average sunshine days in March:
17.9 days - Average sunshine days in April:
15.4 days - Average sunshine days in May:
12.1 days - Average sunshine days in June:
14.5 days
- Average sunshine days in July:
14.3 days - Average sunshine days in August:
17.4 days - Average sunshine days in September:
19.4 days - Average sunshine days in October:
20.4 days - Average sunshine days in November:
20.5 days - Average sunshine days in December:
21 days
The month with the most sunshine days is December (21 days).
The month with the least sunshine days is May (12.1 days).
Average UV index
Greencastle, 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, October, November and December (UV index 2).
Average cloud cover
Greencastle, IN
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility
Greencastle, IN
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
