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Middletown, Delaware climate

Cfa Humid subtropical

Middletown has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 31°C, while the coldest is January averaging around −4°C at night. Precipitation is fairly even year-round, totalling about 1193 mm.

☀️ Summers

Hot

Highs near 31°C in July.

About 25 days a year above 32 °C

❄️ Winters

Cold

Lows near −4°C in January.

About 78 freezing nights a year

🌧️ Rain

Wet

About 1193 mm of rain a year.

Wettest in September

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+0.4 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Middletown climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	6	8	12	19	24	29	31	30	26	21	14	8
Avg temp (°C)	1	2	6	13	18	23	25	24	21	14	8	4
Avg low (°C)	−4	−4	0	6	11	16	19	18	15	8	2	−1
Precipitation (mm)	87	74	108	94	92	100	123	100	124	102	85	103

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	6	8	12	19	24	29
Avg temp (°C)	1	2	6	13	18	23
Avg low (°C)	−4	−4	0	6	11	16
Precipitation (mm)	87	74	108	94	92	100

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	31	30	26	21	14	8
Avg temp (°C)	25	24	21	14	8	4
Avg low (°C)	19	18	15	8	2	−1
Precipitation (mm)	123	100	124	102	85	103

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	8	7	9	9	10	6	8	6	8	7	6	9
Days with high ≥ 32°C (days)	—	—	—	0.2	2	4	11	6	2	0.1	—	—
Days with low ≤ 0°C (days)	20	16	12	3	—	—	—	—	—	0.8	8	18
Days with snowfall ≥ 2.5 cm (days)	0.6	0.5	0.2	—	—	—	—	—	—	—	—	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	8	7	9	9	10	6
Days with high ≥ 32°C (days)	—	—	—	0.2	2	4
Days with low ≤ 0°C (days)	20	16	12	3	—	—
Days with snowfall ≥ 2.5 cm (days)	0.6	0.5	0.2	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	8	6	8	7	6	9
Days with high ≥ 32°C (days)	11	6	2	0.1	—	—
Days with low ≤ 0°C (days)	—	—	—	0.8	8	18
Days with snowfall ≥ 2.5 cm (days)	—	—	—	—	—	0.1

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	62	62	62	62	62	59	55	54	54	54	59	63
Clear days (≤ 30% cloud)	5	5	6	6	5	6	7	8	9	10	7	5
Partly cloudy days (30–70%)	11	10	11	9	12	12	13	12	10	10	11	11
Cloudy days (≥ 70%)	14	13	15	15	14	12	11	11	11	12	12	15
Relative humidity (%)	84	83	81	78	79	76	71	72	74	77	80	84
Wind speed (mph)	7.0	7.1	7.3	6.8	5.6	5.1	4.6	4.5	5.1	5.7	6.0	6.3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	62	62	62	62	62	59
Clear days (≤ 30% cloud)	5	5	6	6	5	6
Partly cloudy days (30–70%)	11	10	11	9	12	12
Cloudy days (≥ 70%)	14	13	15	15	14	12
Relative humidity (%)	84	83	81	78	79	76
Wind speed (mph)	7.0	7.1	7.3	6.8	5.6	5.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	55	54	54	54	59	63
Clear days (≤ 30% cloud)	7	8	9	10	7	5
Partly cloudy days (30–70%)	13	12	10	10	11	11
Cloudy days (≥ 70%)	11	11	11	12	12	15
Relative humidity (%)	71	72	74	77	80	84
Wind speed (mph)	4.6	4.5	5.1	5.7	6.0	6.3

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Newark AG Farm (NOAA GHCN station USC00076410), about 24 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →