, with very cold winters and warm to hot summers, during which there are quite frequent thunderstorms.
The city is located in the eastern United States, in eastern Pennsylvania, along the Lehigh River. The nearby cities of Bethlehem and Easton are part of the metropolitan area.
of the coldest month (January) is of -1.1 °C (30 °F), that of the warmest month (July) is of 24.2 °C (76 °F).
amounts to 1,205 millimeters (47.4 inches) per year.
, from late November to early March, is very cold.
are frequent, and at times can be abundant. On average, 84 centimeters (33 inches) of snow fall per year.
are intense, in fact, the temperature typically drops to -15 °C (5 °F) on the coldest nights of the year, and can drop to -20 °C (-4 °F) once every few years. The record cold, -26 °C (-15 °F), was set in January 1994.
However, there can also be short, fairly mild periods, with highs of 12/13 °C (54/55 °F) or more.
, from June to August, is hot and quite sunny, although thunderstorms can break out in the afternoon.
. Typically, the temperature reaches 35/36 °C (95/97 °F) on the hottest days of the year, although the record is 40 °C (104 °F), set in July 2011.
, from mid-March to May and from September to mid-November, are unsettled seasons, with fairly frequent rains and sudden changes in temperature. However, there are also stable and pleasant periods.
The best times to visit Allentown are spring and autumn, especially the months of May and September.
In October, typically peaking in the second and third week, you can admire the beautiful colors of the trees losing their leaves (the phenomenon called
. Here are the average temperatures.
January, the coldest month of the year, is generally a very cold month. The average temperature is of
-1.1 °C, with a minimum of
-5.7 °C and a maximum of
3.6 °C.
On the coldest nights of the month, the temperature usually drops to around
-15.5 °C. However, it dropped to
-26.2 °C in January 1994.
On the warmest days of the month, the temperature usually reaches around
15.5 °C. However, it reached
21.1 °C in January 2007.
Precipitation amounts to
85 mm, distributed over 11 days.
The day lasts on average 9 hours and 40 minutes.
The average humidity is 66%.
The average wind speed is of
12.9 kph.
February is generally a cold month. The average temperature is of
0.2 °C, with a minimum of
-4.9 °C and a maximum of
5.3 °C.
On the coldest nights of the month, the temperature usually drops to around
-14.5 °C. However, it dropped to
-22.2 °C in February 1996.
On the warmest days of the month, the temperature usually reaches around
15.5 °C. However, it reached
27.2 °C in February 2018.
Precipitation amounts to
70 mm, distributed over 10 days.
The day lasts on average 10 hours and 40 minutes.
The average humidity is 62%.
The average wind speed is of
13.3 kph.
March is generally a quite cold month. The average temperature is of
4.8 °C, with a minimum of
-0.8 °C and a maximum of
10.4 °C.
On the coldest nights of the month, the temperature usually drops to around
-10 °C. However, it dropped to
-17.8 °C in March 2015.
On the warmest days of the month, the temperature usually reaches around
21.5 °C. However, it reached
30.6 °C in March 1998.
Precipitation amounts to
90 mm, distributed over 11 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 59%.
The average wind speed is of
14.1 kph.
April is generally a mild month. The average temperature is of
11 °C, with a minimum of
4.6 °C and a maximum of
17.4 °C.
On the coldest nights of the month, the temperature usually drops to around
-3.5 °C. However, it dropped to
-6.7 °C in April 2016.
On the warmest days of the month, the temperature usually reaches around
28.5 °C. However, it reached
33.3 °C in April 2010.
Precipitation amounts to
95 mm, distributed over 12 days.
The day lasts on average 13 hours and 25 minutes.
The average humidity is 57%.
The average wind speed is of
13.6 kph.
May is generally a very mild month. The average temperature is of
16.7 °C, with a minimum of
10.3 °C and a maximum of
23.1 °C.
On the coldest nights of the month, the temperature usually drops to around
2 °C. However, it dropped to
-1.7 °C in May 1996.
On the warmest days of the month, the temperature usually reaches around
32 °C. However, it reached
34.4 °C in May 2013.
Precipitation amounts to
95 mm, distributed over 12 days.
The day lasts on average 14 hours and 30 minutes. So the days are long.
The average humidity is 63%.
The average wind speed is of
11.4 kph.
June is generally a warm month. The average temperature is of
21.6 °C, with a minimum of
15.5 °C and a maximum of
27.7 °C.
On the coldest nights of the month, the temperature usually drops to around
8 °C. However, it dropped to
2.8 °C in June 1996.
On the warmest days of the month, the temperature usually reaches around
33.5 °C. However, it reached
36.1 °C in June 1991.
Precipitation amounts to
110 mm, distributed over 11 days.
The day lasts on average 15 hours and 0 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
The average humidity is 67%.
The average wind speed is of
10.6 kph.
July, the warmest month of the year, is generally a warm to hot month. The average temperature is of
24.2 °C, with a minimum of
18.2 °C and a maximum of
30.2 °C.
On the coldest nights of the month, the temperature usually drops to around
12 °C. However, it dropped to
7.8 °C in July 2001.
On the warmest days of the month, the temperature usually reaches around
35 °C. However, it reached
40 °C in July 2011.
Precipitation amounts to
135 mm, distributed over 11 days.
The day lasts on average 14 hours and 40 minutes. So the days are long.
The average humidity is 68%.
The average wind speed is of
9.5 kph.
August is generally a warm to hot, muggy month. The average temperature is of
23.1 °C, with a minimum of
17.1 °C and a maximum of
29.1 °C.
On the coldest nights of the month, the temperature usually drops to around
10.5 °C. However, it dropped to
7.2 °C in August 2000.
On the warmest days of the month, the temperature usually reaches around
33.5 °C. However, it reached
37.2 °C in August 1999.
Precipitation amounts to
115 mm, distributed over 10 days.
The day lasts on average 13 hours and 40 minutes.
The average humidity is 70%. Hence, the air is normally humid.
The average wind speed is of
8.7 kph.
September is generally a warm month. The average temperature is of
19.1 °C, with a minimum of
12.9 °C and a maximum of
25.2 °C.
On the coldest nights of the month, the temperature usually drops to around
4.5 °C. However, it dropped to
0 °C in September 2000.
On the warmest days of the month, the temperature usually reaches around
32 °C. However, it reached
35.6 °C in September 2010.
Precipitation amounts to
125 mm, distributed over 10 days.
The day lasts on average 12 hours and 25 minutes.
The average humidity is 71%. Hence, the air is normally humid.
The average wind speed is of
9.3 kph.
October is generally a mild month. The average temperature is of
12.6 °C, with a minimum of
6.6 °C and a maximum of
18.6 °C.
On the coldest nights of the month, the temperature usually drops to around
-2 °C. However, it dropped to
-4.4 °C in October 2001.
On the warmest days of the month, the temperature usually reaches around
27 °C. However, it reached
33.3 °C in October 2019.
Precipitation amounts to
105 mm, distributed over 10 days.
The day lasts on average 11 hours and 5 minutes.
The average humidity is 70%. Hence, the air is normally humid.
The average wind speed is of
10.4 kph.
November is generally a quite mild month. The average temperature is of
6.6 °C, with a minimum of
1.2 °C and a maximum of
12.1 °C.
On the coldest nights of the month, the temperature usually drops to around
-7 °C. However, it dropped to
-11.7 °C in November 2018.
On the warmest days of the month, the temperature usually reaches around
22 °C. However, it reached
26.1 °C in November 1994.
Precipitation amounts to
80 mm, distributed over 9 days.
The day lasts on average 9 hours and 55 minutes.
The average humidity is 67%.
The average wind speed is of
11.1 kph.
December is generally a cold month. The average temperature is of
1.6 °C, with a minimum of
-2.9 °C and a maximum of
6.2 °C.
On the coldest nights of the month, the temperature usually drops to around
-11 °C. However, it dropped to
-18.9 °C in December 2005.
On the warmest days of the month, the temperature usually reaches around
16.5 °C. However, it reached
22.2 °C in December 1998.
Precipitation amounts to
100 mm, distributed over 12 days.
The day lasts on average 9 hours and 20 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
The average humidity is 69%.
The average wind speed is of
11.9 kph.