Climate Chart of Philadelphia, USA

Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023

For Philadelphia, USA, the climate data describe 2013–2023. Across the year, monthly mean temperatures span from January at 0.8 °C to July at 25.6 °C, giving a broad sense of the annual temperature range without describing daytime highs or lows. Mean daily rainfall and sunshine also vary by month, while recorded snowfall is concentrated most strongly in one monthly average. These figures offer useful planning context, but monthly means do not predict conditions on any particular day.

Climate overview

Temperature

Monthly mean temperature is lowest in January at 0.8 °C, and reaches its highest monthly mean in July at 25.6 °C. The unweighted mean across the calendar-month means is 13.1 °C. These are monthly averages, not daytime maximum temperatures, so they describe the broad temperature pattern rather than the range visitors may encounter over a day.

Rain

Mean daily rainfall is lowest in January at 2.07 mm/day and highest in July at 3.98 mm/day. The unweighted mean of the monthly daily-rainfall averages is 3.10 mm/day. These are daily mean amounts, not monthly accumulation totals; they do not show how often rain falls or guarantee dry conditions in the lower-average month.

Snow

Mean daily snowfall has its highest monthly average in February at 6.23 mm/day; the unweighted mean across the calendar-month averages is 1.47 mm/day. These figures describe average daily amounts, not the number of snowy days, snow depth or how long snow remains on the ground, so they cannot establish snow-cover or skiing conditions.

Sunshine

Mean daily sunshine reaches its highest monthly average in July at 11.42 hours/day, while the lowest is in December at 5.30 hours/day. Across the calendar months, the unweighted mean is 8.27 hours/day per day. Sunshine duration can help with broad outdoor-planning expectations, but it is not a measure of daylight length and does not promise clear skies on a given date.

Best Travel Time Guide for Philadelphia, USA: Ideal Seasons and Weather Insights

For visitors prioritising cooler monthly-average conditions, January is the relevant reference point, with a monthly mean of 0.8 °C; this does not indicate the temperature on every day, so check forecasts closer to travel and pack for variable conditions. If lower average rainfall is a priority, January is the conditional option, with mean daily rainfall of 2.07 mm/day. It is not a guarantee of dry weather or a measure of rain frequency. In July, the mean daily amount is 3.98 mm/day, making rain-ready clothing or a compact umbrella sensible preparation.

For outdoor sightseeing planned around average sunshine, July has the highest mean daily duration at 11.42 hours/day, while December has the lowest at 5.30 hours/day. These averages may inform daylight-outdoor planning, but sunshine duration is not day length and does not assure clear conditions. The rainfall, temperature and sunshine criteria point to different considerations rather than a single universally best time to visit. The highest monthly mean daily snowfall occurs in February at 6.23 mm/day. This average alone cannot tell you whether snow will fall during a visit or establish snow depth or cover, so use current forecasts for travel decisions.

Climate Data Overview for Philadelphia, USA

Explore the comprehensive climate data for Philadelphia, USA. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.

Month	Average: Temperature °C	Rain (mm) / day	Snow (mm) / day	Sunshine (h) / day
Jan	0.8	2.07	3.88	5.67
Feb	2.0	2.42	6.23	6.51
Mar	5.5	2.47	4.91	7.59
Apr	11.8	3.33	0.31	8.86
May	17.3	3.35	0.00	9.63
Jun	22.3	3.82	0.00	11.01
Jul	25.6	3.98	0.00	11.42
Aug	24.3	3.21	0.00	10.22
Sep	21.0	3.35	0.00	8.93
Oct	15.0	3.29	0.00	7.26
Nov	7.8	2.50	0.71	6.89
Dec	4.1	3.45	1.63	5.30
Average	13.1	3.10	1.47	8.27