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Current Weather at Amistad NRA Headquarters

Hazardous Weather Conditions

Lat: 29.52115821838379 Long: -101.03813934326172

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View of Highway 90 bridge over Amistad Reservoir from Diablo East trail.

NPS

Climate

The climate at Amistad is semi-arid in moisture and subtropical in temperature. Humidity is more often high than low, with periodic morning fog. Summers are long, hot, and frequently humid; winters are mild and vary between sunny, warm, cloudy, and cool weather.

Nearly 80% of the annual precipitation occurs from April through October. During this period, rainfall is mainly in the form of thunderstorms and heavy downpours often resulting in flash flooding. The small amount of precipitation for November through March usually falls as steady light rain or drizzle. Average annual rainfall is near 19 inches. Rainfall extremes vary from 4.34 inches in 1956 to 37.75 inches in 1914.

Over the course of a year, the temperature at Amistad typically varies from 40°F to 98°F and is rarely below 31°F or above 102°F. The hot season lasts from May 24 to September 10 with an average daily high above 91°F. The hottest day of the year is August 11 with an average high of 98°F. The cold season lasts from November 24 to February 17 with an average daily high below 70°F. The coldest day of the year is January 1 with an average low of 40°F and high of 65°F.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Record High (°F)	92	99	103	106	109	112	111	109	110	109	96	90
Average High (°F)	64	69	76	84	90	95	97	97	91	82	72	64
Average Low (°F)	41	45	52	60	68	74	75	75	70	61	50	41
Record Low (°F)	12	11	19	33	45	49	63	60	43	28	17	10
Average Precipitation (inches)	0.72	0.92	1.14	1.65	2.81	2.35	1.78	2.18	2.20	2.23	0.93	0.65