Season Calculator
Find the current meteorological season for any date and hemisphere.
Winter
12, 1, 2
Spring
3, 4, 5
Summer
6, 7, 8
Autumn
9, 10, 11
About this tool
Seasons are natural cycles of weather and climate patterns that occur in most temperate regions on Earth, shaped by the planet's 23.5° axial tilt as it orbits the Sun. Understanding which season a given date falls into is useful for planning outdoor activities, predicting weather, tracking seasonal trends, and studying climate patterns. However, determining the exact season requires knowledge of meteorological boundaries, which vary slightly by hemisphere.
This tool calculates the meteorological season for any date you enter, showing whether that day falls in Spring, Summer, Autumn, or Winter for either the Northern or Southern Hemisphere. Simply select your date and hemisphere, then click "Find Season" to see the current season, its start and end dates, how many days have passed since it began, and how many days remain until it ends. The results include a visual summary card with an emoji representing each season.
Meteorological seasons are defined by calendar months (Spring: March–May, Summer: June–August, Autumn: September–November, Winter: December–February in the Northern Hemisphere), making them simpler and more consistent for data analysis than astronomical seasons, which depend on solstices and equinoxes. This tool is particularly helpful for weather forecasters, educators, students, travelers planning trips across hemispheres, and anyone curious about seasonal timing.
Frequently Asked Questions
Code Implementation
from datetime import date
def get_meteorological_season(month: int, hemisphere: str = "northern") -> str:
"""Get meteorological season for a given month."""
northern = {
12: "Winter", 1: "Winter", 2: "Winter",
3: "Spring", 4: "Spring", 5: "Spring",
6: "Summer", 7: "Summer", 8: "Summer",
9: "Autumn", 10: "Autumn", 11: "Autumn",
}
southern = {
12: "Summer", 1: "Summer", 2: "Summer",
3: "Autumn", 4: "Autumn", 5: "Autumn",
6: "Winter", 7: "Winter", 8: "Winter",
9: "Spring", 10: "Spring", 11: "Spring",
}
if hemisphere.lower() == "southern":
return southern[month]
return northern[month]
def season_dates(month: int, year: int, hemisphere: str = "northern") -> dict:
"""Get season start/end dates for the given month."""
season = get_meteorological_season(month, hemisphere)
if hemisphere.lower() == "southern":
starts = {"Summer": 12, "Autumn": 3, "Winter": 6, "Spring": 9}
else:
starts = {"Spring": 3, "Summer": 6, "Autumn": 9, "Winter": 12}
start_month = starts[season]
start_year = year if start_month <= month else year - 1
start = date(start_year, start_month, 1)
end_month = (start_month + 2) % 12 + 1
end_year = start_year + (1 if start_month + 2 > 12 else 0)
import calendar
end_day = calendar.monthrange(end_year, end_month)[1]
end = date(end_year, end_month, end_day)
return {"season": season, "start": start.isoformat(), "end": end.isoformat()}
today = date.today()
info = season_dates(today.month, today.year)
print(f"Season: {info['season']} ({info['start']} to {info['end']})")Comments & Feedback
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