Weather & Climate in Emmaus, PA

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Emmaus experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 30°F in January while summers reach 76°F in July. The area gets 275 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 47.4 inches (wetter than the 38-inch national average). The area receives 33.1 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 40. The city sits at an elevation of 428 feet.

Temperature

30°F Jan (-1°C) 76°F Jul (24°C)

Annual Average	53.1°F
	2% below US avg
January Average	30°F (-1°C)
July Average	76°F (24°C)
Sunny Days	275 days/yr

Geography

Elevation	428 ft (130 m)
Area	2.9 sq mi (7.5 km²)
Population Density	4,044/sq mi
Coordinates	40.5352°N, 75.4979°W
Timezone	America/New_York
County	Lehigh County County
Nearest Airport	Lehigh Valley International (ABE) 9 miles away

Precipitation & Snow

Annual Rainfall 47.4"

25% above US avg

Snowfall 33.1"

Wettest Month (May) 4.53"

Driest Month (Feb) 2.80"

Air Quality

AQI Median	40.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Moderate
Risk Score	93.9 / 100
Social Vulnerability	58.5 / 100
Community Resilience	73.6 / 100

Hazard Breakdown

Tornado	Relatively Moderate
Hurricane	Relatively Moderate
Earthquake	Relatively Low
Wildfire	Very Low
Flood	Relatively High
Hail	Relatively Low
Strong Wind	Relatively High
Heat Wave	Relatively Moderate
Winter Weather	Very High
Lightning	Relatively High
Ice Storm	Relatively Moderate
Drought	Relatively Moderate
Cold Wave	Very High
Landslide	Relatively Low
Avalanche	Very Low

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

34 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.

Apr 5, 2024	2024 Tewksbury, New Jersey Earthquake	M4.8	65 km	3 km
Jan 16, 1994	2 km W of Sinking Spring, Pennsylvania	M4.6	51 km	5 km
Jan 16, 1994	0 km E of Sinking Spring, Pennsylvania	M4.2	49 km	5 km
Apr 5, 2024	7 km WSW of Gladstone, New Jersey	M3.7	66 km	4 km
Oct 23, 1990	3 km W of Hancocks Bridge, New Jersey	M3.2	114 km	10 km
Jan 9, 1992	4 km WNW of Robertsville, New Jersey	M3.1	100 km	8 km
Aug 26, 2003	4 km NNW of Milford, New Jersey	M3.1	34 km	3 km
Jun 3, 2010	4 km ENE of Franklintown, Pennsylvania	M3.1	135 km	2 km
Aug 3, 2025	0 km W of Little Ferry, New Jersey	M3.0	127 km	10 km
Nov 14, 1997	0 km S of Rothsville, Pennsylvania	M3.0	77 km	5 km
Feb 3, 2009	1 km ESE of Victory Gardens, New Jersey	M3.0	90 km	0 km
Apr 24, 2009	1 km S of Franklintown, Pennsylvania	M2.9	140 km	1 km
Apr 27, 2024	7 km WSW of Gladstone, New Jersey	M2.9	66 km	5 km
Jan 16, 1994	0 km SSE of Sinking Spring, Pennsylvania	M2.9	49 km	5 km
May 24, 2024	6 km E of Califon, New Jersey	M2.9	66 km	7 km
Sep 15, 2019	5 km ESE of East Berlin, Pennsylvania	M2.8	138 km	5 km
May 10, 1993	1 km NW of Whitfield, Pennsylvania	M2.8	49 km	5 km
Aug 5, 2025	1 km N of Hillsdale, New Jersey	M2.8	134 km	12 km
Jul 1, 2009	3 km ESE of Pennsville, New Jersey	M2.8	99 km	5 km
Oct 25, 2009	4 km ENE of Franklintown, Pennsylvania	M2.8	135 km	1 km

Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Hurricane History

3 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.

Year	Name	Category	Max Wind	Closest
2011	Irene	Category 1	75 mph	274 km
1991	Bob	Category 2	109 mph	280 km
1985	Gloria	Category 2	98 mph	172 km

Source: NOAA IBTrACS (Category 1+, 1980–2026).

Tornado History

366 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 9 fatalities, 247 injuries.

Date	Rating	Distance	Path	Fatalities
Sep 1, 2021	EF3	98 km	12.4 mi	0
Jul 29, 2021	EF3	61 km	3.4 mi	0
Jul 14, 2004	EF3	96 km	7.5 mi	0
May 31, 1998	EF3	35 km	8.3 mi	0
May 31, 1998	EF3	91 km	20.0 mi	0
Jul 27, 1994	EF3	34 km	2.0 mi	3
Jul 27, 1994	EF3	93 km	4.0 mi	0
Oct 18, 1990	EF3	62 km	0.5 mi	0
Jul 26, 1981	EF3	27 km	3.3 mi	0
Sep 26, 1977	EF3	85 km	5.9 mi	0
Mar 21, 1976	EF3	56 km	0.5 mi	0
May 28, 1973	EF3	89 km	0.4 mi	0
May 28, 1973	EF3	74 km	0.4 mi	0
Jun 18, 1970	EF3	70 km	1.9 mi	1
Apr 28, 1961	EF3	96 km	0.3 mi	0
Jun 24, 1960	EF3	68 km	12.9 mi	0
Mar 22, 1955	EF3	64 km	9.6 mi	1
Nov 4, 1950	EF3	65 km	15.9 mi	0
Feb 21, 2023	EF2	73 km	5.8 mi	0
Sep 1, 2021	EF2	94 km	5.9 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

2 tsunamis recorded within 500 km.

Year	Location	Cause	Max Wave	Deaths	Distance
1895	HIGH BRIDGE, NJ	Earthquake	—	—	54 km
1840	PHILADELPHIA, PENNSYLVANIA	Earthquake	—	—	86 km

Source: NOAA/NCEI Historical Tsunami Database.

Wildfire History

12 wildfires (100+ acres) recorded within 100 km. Largest: 16 MILE (7,896 acres, 2016).

Year	Name	Acres Burned	Distance
2016	16 MILE	7,896	79 km
2009	PENOBSCOT	2,091	80 km
2004	CRYSTAL LAKE	1,838	75 km
2012	HOPEWELL FIRE	812	42 km
2020	SEVEN PINES	790	71 km
1985	UNNAMED	737	95 km
2015	RAZOR FIRE	728	31 km
2015	PIPELINE 1	666	67 km
2016	BEAR TOWN	649	76 km
2014	TURKEY RUN ROAD	546	99 km
1999	WORTHINGTO	514	60 km
2023	BUZBY BOGGS	501	93 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	30°F (-1°C)	3.4 in
February	30°F (-1°C)	2.8 in	Coldest, Driest
March	39°F (4°C)	3.5 in
April	49°F (9°C)	3.7 in
May	60°F (15°C)	4.5 in	Wettest
June	68°F (20°C)	4.0 in
July	76°F (24°C)	4.3 in	Warmest
August	72°F (22°C)	4.2 in
September	65°F (18°C)	4.1 in
October	53°F (12°C)	3.5 in
November	43°F (6°C)	3.9 in
December	33°F (1°C)	3.5 in

Emmaus has a seasonal temperature swing of 46°F / from 30°F in February to 76°F in July. Total annual precipitation is 45.3 inches, with May being the wettest month (4.5") and February the driest (2.8").

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