May
May · September · June
82climate match
United States · 1991–2020
Best time to visit
Bell Road (historical).
May leads for comfortable weather in Bell Road (historical): typically 23.5°C by day, 12.8°C at night, with 85 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortMay
Typical high23.5°C
Typical low12.8°C
Rain in May85 mm
August
August · July · June
78climate match
October
October · April · May
85climate match
The weakest month is January, scoring 5 against May’s 82 — days reach only 5.2°C, 19° below the 24°C the score treats as ideal.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
55.2° / -2.9°
Feb
56.8° / -2.1°
Mar
2111.5° / 1.7°
Apr
5418.1° / 7.2°
May
8223.5° / 12.8°
Jun
6528.4° / 18.2°
Jul
5031° / 21.3°
Aug
5729.8° / 20.4°
Sep
7626° / 16.5°
Oct
6519.5° / 10°
Nov
3613.3° / 4.2°
Dec
57.8° / 0°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 5.2°C | -2.9°C | 80 mm | 8.5 | 9 h 38 | 5 | Strong coverage |
| February | 6.8°C | -2.1°C | 70 mm | 7.6 | 10 h 37 | 5 | Strong coverage |
| March | 11.5°C | 1.7°C | 101 mm | 8.6 | 11 h 49 | 21 | Strong coverage |
| April | 18.1°C | 7.2°C | 88 mm | 8.3 | 13 h 12 | 54 | Strong coverage |
| May | 23.5°C | 12.8°C | 85 mm | 8.5 | 14 h 21 | 82 | Strong coverage |
| June | 28.4°C | 18.2°C | 103 mm | 8.5 | 14 h 59 | 65 | Strong coverage |
| July | 31°C | 21.3°C | 111 mm | 8.1 | 14 h 44 | 50 | Strong coverage |
| August | 29.8°C | 20.4°C | 109 mm | 7.1 | 13 h 44 | 57 | Strong coverage |
| September | 26°C | 16.5°C | 112 mm | 7.5 | 12 h 24 | 76 | Strong coverage |
| October | 19.5°C | 10°C | 88 mm | 6.8 | 11 h 05 | 65 | Strong coverage |
| November | 13.3°C | 4.2°C | 74 mm | 6.8 | 9 h 55 | 36 | Strong coverage |
| December | 7.8°C | 0°C | 101 mm | 8.7 | 9 h 21 | 5 | Strong coverage |
What has changed
Bell Road (historical) runs +1.5°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
+2.2
Feb
+2.7
Mar
+1.4
Apr
+1.5
May
+1.0
Jun
+1.1
Jul
+1.6
Aug
+0.7
Sep
+1.3
Oct
+1.3
Nov
+0.7
Dec
+2.5
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 23.3°C26 Jan 1950 | -21.7°C22 Jan 1984 | 59 mm23 Jan 1998 | 225 mm1978 · driest 11 mm in 1955 | 86 |
| February | 25.0°C21 Feb 2018 | -20.0°C2 Feb 1961 | 50 mm13 Feb 1966 | 163 mm1979 · driest 14 mm in 2002 | 86 |
| March | 30.6°C29 Mar 1945 | -13.9°C10 Mar 1984 | 79 mm23 Mar 2024 | 186 mm2010 · driest 17 mm in 1966 | 86 |
| April | 35.0°C17 Apr 2002 | -7.2°C7 Apr 1982 | 112 mm30 Apr 2014 | 230 mm2007 · driest 13 mm in 1985 | 86 |
| May | 36.7°C19 May 2026 | -2.2°C11 May 1966 | 63 mm2 May 1989 | 188 mm1948 · driest 6 mm in 2023 | 86 |
| June | 38.3°C24 Jun 2025 | 6.7°C17 Jun 1964 | 117 mm29 Jun 1973 | 268 mm2013 · driest 3 mm in 1949 | 86 |
| July | 40.0°C3 Jul 1966 | 10.6°C21 Jul 1966 | 204 mm28 Jul 2013 | 336 mm2013 · driest 16 mm in 1957 | 86 |
| August | 38.3°C9 Aug 2001 | 6.7°C29 Aug 1986 | 123 mm14 Aug 2011 | 491 mm2011 · driest 13 mm in 1964 | 85 |
| September | 37.8°C2 Sep 1953 | 1.7°C25 Sep 1963 | 168 mm16 Sep 1999 | 332 mm1999 · driest 6 mm in 2005 | 85 |
| October | 35.6°C5 Oct 1941 | -3.9°C25 Oct 1962 | 141 mm8 Oct 2005 | 221 mm2005 · driest 0 mm in 2024 | 85 |
| November | 28.9°C1 Nov 1950 | -9.4°C30 Nov 1976 | 101 mm7 Nov 1977 | 230 mm1972 · driest 8 mm in 1976 | 85 |
| December | 22.8°C7 Dec 1998 | -17.2°C25 Dec 1983 | 74 mm13 Dec 1941 | 225 mm2009 · driest 6 mm in 1955 | 86 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 23 | 3 | 4 |
| February | 0 | 0 | 20 | 3 | 4 |
| March | <1 | 0 | 12 | 4 | 2 |
| April | 4 | <1 | <1 | 3 | <1 |
| May | 12 | 4 | 0 | 3 | 0 |
| June | 24 | 12 | 0 | 4 | 0 |
| July | 30 | 21 | 0 | 3 | 0 |
| August | 29 | 16 | 0 | 3 | 0 |
| September | 19 | 6 | 0 | 3 | 0 |
| October | 5 | <1 | <1 | 3 | 0 |
| November | <1 | 0 | 5 | 3 | <1 |
| December | 0 | 0 | 17 | 4 | 2 |
The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 88); on 2011–2025 it is May (89). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 27% | 9% | 29% | 1.1–7.9°C |
| February | 1% | 26% | 9% | 28% | 2.8–9.6°C |
| March | 8% | 28% | 11% | 31% | 8.3–14.3°C |
| April | 28% | 28% | 10% | 31% | 15.3–20.3°C |
| May | 57% | 29% | 10% | 36% | 20.9–25.2°C |
| June | 71% | 28% | 11% | 30% | 26.3–29.5°C |
| July | 75% | 26% | 10% | 26% | 29.0–32.5°C |
| August | 76% | 24% | 10% | 22% | 27.9–31.1°C |
| September | 71% | 23% | 9% | 23% | 23.9–27.6°C |
| October | 40% | 20% | 8% | 16% | 17.5–21.5°C |
| November | 8% | 24% | 9% | 22% | 10.8–15.3°C |
| December | <1% | 26% | 10% | 29% | 3.5–9.9°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 4556483
- NOAA station
- USW00013739 · PHILA INTL AP
- Station distance
- 3.8 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 39.91°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.