Bethlehem, Pennsylvania Climate by Month
Bethlehem, Pennsylvania, United States
Hot summers and cold winters, with rain spread through the year.
Hot summers and cold winters, with rain spread through the year: that's Bethlehem's climate in short. Expect highs of 87°F (31°C) in July and 38°F (3°C) in January, with the coldest nights (January) near 21°F (-6°C). About 44 in (1119 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 87°F(31°C)
- Average high, July
- Coldest nights
- 21°F(-6°C)
- Average low, January
- Rain per year
- 44 in(1119 mm)
- No clear rainy season
- Humidity
- 66%
- Sunniest: July
Best and worst months in Bethlehem
Best for weatherThe most comfortable weather comes in May, with highs around 74°F (23°C) and about 3.8 in (96 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 38°F (3°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Bethlehem weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 38°F(3°C) | 21°F(-6°C) | 3.2 in(82 mm) | 72% | 1.7 |
| FebFebruary | 41°F(5°C) | 21°F(-6°C) | 2.6 in(66 mm) | 68% | 2.7 |
| MarMarch | 50°F(10°C) | 29°F(-1°C) | 3.5 in(90 mm) | 60% | 3.6 |
| AprApril | 63°F(17°C) | 39°F(4°C) | 3.4 in(87 mm) | 56% | 4.5 |
| MayMayBest | 74°F(23°C) | 49°F(10°C) | 3.8 in(96 mm) | 65% | 5.3 |
| JunJune | 83°F(28°C) | 58°F(15°C) | 4.3 in(109 mm) | 67% | 5.7 |
| JulJuly | 87°F(31°C) | 64°F(18°C) | 3.8 in(97 mm) | 63% | 5.8 |
| AugAugust | 85°F(30°C) | 62°F(17°C) | 4.0 in(101 mm) | 67% | 5.0 |
| SepSeptember | 79°F(26°C) | 55°F(13°C) | 4.4 in(111 mm) | 66% | 4.1 |
| OctOctober | 67°F(19°C) | 43°F(6°C) | 4.0 in(101 mm) | 68% | 2.8 |
| NovNovember | 55°F(13°C) | 34°F(1°C) | 3.3 in(84 mm) | 71% | 1.9 |
| DecDecember | 44°F(6°C) | 26°F(-3°C) | 3.7 in(95 mm) | 73% | 1.5 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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