Death Valley

	California, United States Of America
	36.45 ° N 116.87 ° W
	167 ft
	Subtropical desert

BWh

Hot desert climate

Csil

Subtropical climate with dry summer with extremely hot summer with mild winter

Traditional Koppen classification: BWh (Hot desert climate)

Official definition:

B – 70 % or more of the total annual rainfall is during the summer half of the year and r (r = average total annual precipitation in mm) is less than 20t + 280 (t = average annual temperature in °C), or 70 % or more of total annual precipitation is during the winter half of the year and r is less than 20t, or no half of the year has less than 70 % of total annual rainfall and r less than 20t + 140. Summer half of the year in the Northern hemisphere is from April to September, on the Southern hemisphere from October to March.
W – r is less than the upper limit for B type classification parameter
h - t is greater than or equal to 18 °C

The desert climate is characterized by extremely small rainfall. In general it includes areas, which have such little precipitation, that there is hardly any vegetation at all.

The total annual precipitation is at most 250 mm, but quite often much less and regions with no rainfall during the entire year are not an exception. In specific cases this climate type is also assigned to places with more than 250 mm of rainfall annually, but where more water is lost by evapotranspiration than falls with rain (for example some parts in Arizona).

Hot desert climate is also defined by very high temperatures all year round. Most commonly these regions are around the 30 ° latitude on both hemispheres. Temperatures can be extreme, exceeding 40 °C and sometimes even above 45 °C. However, due to the fact they are usually far inland, the differences between day and night can also be extreme and during night it is sometimes even freezing. Areas with BWh climate type are the ones where the absolutely highest temperatures on Earth have been measured (Death Valley, some parts in Libya etc.).

The most well-known region with this climate is the largest desert on Earth, the Sahara in Africa. Other areas with this climate include the deserts in Libya, parts in southern Africa (Namib desert, Kalahari desert), some parts of Mexico, large areas especially in the central Australia and also some regions in the Middle East.

Very low precipitation also means very little cloudiness, some regions can have clouds only less than 30 days per year.

Modern Trewartha classification: Csil (Subtropical climate with dry summer with extremely hot summer with mild winter)

Subtropical in the Koppen and Trewartha classification is defined as a region, where at least eight months has an average temperature of more than 10 °C, but the coldest month has an average temperature of less than 18 °C. The individual subtypes then differ in their annual precipitation distribution. In Trewartha classification there is a condition of maximum annual precipitation of 900 mm.

In general the subtropical climate is usually found in areas polewards from the tropical zones. It can also be found inside tropical zones at places with higher altitude. Typical are for example citrus trees or palm trees.

The Cs subtype in the Trewartha classification represents a subtropical climate with dry summer, sometimes referred to as the Mediterranean climate. It is characterized by hot and dry summers and mild winters, during which most of the precipitation is observed. High pressure is the dominating factor in the summer, when precipitation is very small and if there is some, it is usually in the form of very short, but intense thunderstorms. In the winter it can sometimes snow, especially at higher altitudes, but in general the winters are mild.

This climate type is most common in western coasts of continents in the middle latitudes, for example it includes areas on the West coast of the U.S. such as California, Southern Europe or Southwest tip of Australia.

extremely hot summer: warmest month with average temperature above 35 °C
mild winter: coldest month with average temperature between 10 and 18 °C

Summary

76 °F
62 / 91

1.9 in
15 days

Temperature

	Month												Average
	1	2	3	4	5	6	7	8	9	10	11	12	Average
Min Temperature(°F)	37.0	43.0	52.0	63.0	72.0	79.0	88.0	84.0	75.0	63.0	46.0	39.0	62.0
Avg Temperature(°F)	52.0	57.0	66.0	77.0	85.0	93.0	101.0	99.0	91.0	78.0	62.0	53.0	76.0
Max Temperature (°F)	66.0	72.0	81.0	91.0	99.0	108.0	115.0	113.0	106.0	93.0	77.0	66.0	91.0
Range	29.0	29.0	29.0	28.0	27.0	29.0	27.0	29.0	31.0	30.0	31.0	27.0	29.0

	Max month	Min month	Annual range
Min Temperature	Jul	Jan	51.0°F
Avg Temperature	Jul	Jan	49.0°F
Max Temperature	Jul	Jan, Dec	49.0°F
Temperature range	Sep, Nov	May, Jul, Dec	78.0°F

													Average
	1	2	3	4	5	6	7	8	9	10	11	12	Average
Min Temperature(°F)
Avg Temperature(°F)
Max Temperature(°F)

	Mar, Apr, May				Jun, Jul, Aug				Sep, Oct, Nov				Dec, Jan, Feb
	Max	Min	Average	Range	Max	Min	Average	Range	Max	Min	Average	Range	Max	Min	Average	Range
Min Temperature	72.0	52.0	62.33	20.0	88.0	79.0	83.67	9.0	75.0	46.0	61.33	29.0	43.0	37.0	39.67	6.0
Avg Temperature	85.0	66.0	76.00	19.0	101.0	93.0	97.67	8.0	91.0	62.0	77.00	29.0	57.0	52.0	54.00	5.0
Max Temperature	99.0	81.0	90.33	18.0	115.0	108.0	112.00	7.0	106.0	77.0	92.00	29.0	72.0	66.0	68.00	6.0

Temperature

	Month												Average
	1	2	3	4	5	6	7	8	9	10	11	12	Average
Avg Temperature (°F)	52.0	57.0	66.0	77.0	85.0	93.0	101.0	99.0	91.0	78.0	62.0	53.0	76.0

	Max month	Min month	Annual range
Avg Temperature	Jul	Jan	49.0°F

	Month												Average
	1	2	3	4	5	6	7	8	9	10	11	12	Average
Avg Temperature (°F)

	Mar, Apr, May				Jun, Jul, Aug				Sep, Oct, Nov				Dec, Jan, Feb
	Max	Min	Average	Range	Max	Min	Average	Range	Max	Min	Average	Range	Max	Min	Average	Range
Avg Temperature	85.0	66.0	76.00	19.0	101.0	93.0	97.67	8.0	91.0	62.0	77.00	29.0	57.0	52.0	54.00	5.0

Humidity

	Month												Average
	1	2	3	4	5	6	7	8	9	10	11	12	Average
Avg Humidity (%)	-9999.0	-9999.0	-9999.0	-9999.0	-9999.0	-9999.0	-9999.0	-9999.0	-9999.0	-9999.0	-9999.0	-9999.0	76.0

	Max month	Min month	Annual range
Avg Humidity	0, Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec	0, Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec	0.0%

	Month												Average
	1	2	3	4	5	6	7	8	9	10	11	12	Average
Avg Humidity (%)

	Mar, Apr, May				Jun, Jul, Aug				Sep, Oct, Nov				Dec, Jan, Feb
	Max	Min	Average	Range	Max	Min	Average	Range	Max	Min	Average	Range	Max	Min	Average	Range
Avg Humidity	-9999.0	-9999.0	-9999.00	0.0	-9999.0	-9999.0	-9999.00	0.0	-9999.0	-9999.0	-9999.00	0.0	-9999.0	-9999.0	-9999.00	0.0

Precipitation

	Month												Monthly average	Annual total
	1	2	3	4	5	6	7	8	9	10	11	12	Monthly average	Annual total
Average monthly precipitation (in)	0.2	0.2	0.2	0.2	0.1	0.0	0.1	0.2	0.1	0.1	0.2	0.3	0.2	1.9
Wetdays	1	2	2	1	1	1	1	1	1	1	1	2	1	15
Wetdays ratio (%)	3.2 1,30	7.1 2,26	6.5 2,29	3.3 1,29	3.2 1,30	3.3 1,29	3.2 1,30	3.2 1,30	3.3 1,29	3.2 1,30	3.3 1,29	6.5 2,29	4.1 4.10959,95.8904

	Max month	Min month	Max Season	Min Season	Annual range
Average monthly precipitation	Dec	Jun	Winter	Summer	0.3in
Wetdays	Feb, Mar, Dec	Jan, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov	Autumn	Summer	1

	Month
	1	2	3	4	5	6	7	8	9	10	11	12
Average monthly precipitation (in)
Wetdays / month

	Mar, Apr, May				Jun, Jul, Aug				Sep, Oct, Nov				Dec, Jan, Feb
	Max	Min	Range	Total	Max	Min	Range	Total	Max	Min	Range	Total	Max	Min	Range	Total
Average monthly precipitation (in)	0.2	0.1	0.1	0.4	0.2	0.0	0.1	0.3	0.2	0.1	0.1	0.4	0.3	0.2	0.1	0.8
Wetdays	2	1	1	4	1	1	0	3	78	1	77	141	2	1	1	5

Precipitation

	Month												Monthly average	Annual total
	1	2	3	4	5	6	7	8	9	10	11	12	Monthly average	Annual total
Average monthly precipitation (in)	0.2	0.2	0.2	0.2	0.1	0.0	0.1	0.2	0.1	0.1	0.2	0.3	0.2	1.9

	Max month	Min month	Max Season	Min Season	Annual range
Average monthly precipitation	Dec	Jun	Winter	Summer	0.3in

	Month
	1	2	3	4	5	6	7	8	9	10	11	12
Average monthly precipitation (in)

	Mar, Apr, May				Jun, Jul, Aug				Sep, Oct, Nov				Dec, Jan, Feb
	Max	Min	Range	Total	Max	Min	Range	Total	Max	Min	Range	Total	Max	Min	Range	Total
Average monthly precipitation (in)	0.2	0.1	0.1	0.4	0.2	0.0	0.1	0.3	0.2	0.1	0.1	0.4	0.3	0.2	0.1	0.8

Sunlight / Day length

			Max day length	Min day length	Sunlight/Day length
Jan	-9999 min -167 h 21 min	599 min 9 h 59 min 599,841	621 min 10 h 21 min (31.1.) 621,819	583 min 9 h 43 min (1.1.) 583,857	-1669.3 % -9999,10598
Feb	-9999 min -167 h 21 min	652 min 10 h 52 min 652,788	683 min 11 h 23 min (29.2.) 683,757	623 min 10 h 23 min (1.2.) 623,817	-1533.5 % -9999,10651
Mar	-9999 min -167 h 21 min	720 min 11 h 60 min 720,720	755 min 12 h 35 min (31.3.) 755,685	685 min 11 h 25 min (1.3.) 685,755	-1389.1 % -9999,10719
Apr	-9999 min -167 h 21 min	789 min 13 h 9 min 789,651	820 min 13 h 40 min (30.4.) 820,620	757 min 12 h 37 min (1.4.) 757,683	-1266.9 % -9999,10788
May	-9999 min -167 h 21 min	847 min 14 h 7 min 847,593	868 min 14 h 28 min (31.5.) 868,572	822 min 13 h 42 min (1.5.) 822,618	-1180.2 % -9999,10846
Jun	-9999 min -167 h 21 min	876 min 14 h 36 min 876,564	878 min 14 h 38 min (20.6.) 878,562	869 min 14 h 29 min (1.6.) 869,571	-1141.8 % -9999,10875
Jul	-9999 min -167 h 21 min	860 min 14 h 20 min 860,580	875 min 14 h 35 min (1.7.) 875,565	839 min 13 h 59 min (31.7.) 839,601	-1162.6 % -9999,10859
Aug	-9999 min -167 h 21 min	808 min 13 h 28 min 808,632	838 min 13 h 58 min (1.8.) 838,602	777 min 12 h 57 min (31.8.) 777,663	-1236.9 % -9999,10807
Sep	-9999 min -167 h 21 min	742 min 12 h 22 min 742,698	775 min 12 h 55 min (1.9.) 775,665	709 min 11 h 49 min (30.9.) 709,731	-1347.8 % -9999,10741
Oct	-9999 min -167 h 21 min	673 min 11 h 13 min 673,767	706 min 11 h 46 min (1.10.) 706,734	640 min 10 h 40 min (31.10.) 640,800	-1486.3 % -9999,10672
Nov	-9999 min -167 h 21 min	613 min 10 h 13 min 613,827	638 min 10 h 38 min (1.11.) 638,802	591 min 9 h 51 min (30.11.) 591,849	-1632.3 % -9999,10612
Dec	-9999 min -167 h 21 min	582 min 9 h 42 min 582,858	590 min 9 h 50 min (1.12.) 590,850	579 min 9 h 39 min (21.12.) 579,861	-1717.3 % -9999,10581
Year	-10832 min -181 h 28 min	730 min 12 h 10 min 730,710	878 min 14 h 38 min (19. 6.) 878,562	579 min 9 h 39 min (20. 12.) 579,861	-1483.4 % -10832,11562

	Mar, Apr, May				Jun, Jul, Aug				Sep, Oct, Nov				Dec, Jan, Feb
	Max	Min	Average	Sunlight/day	Max	Min	Average	Sunlight/day	Max	Min	Average	Sunlight/day	Max	Min	Average	Sunlight/day
(min/day)	-9999	-9999	-9999	-1273.1% -9999,10784	-9999	-9999	-9999	-1179.5% -9999,10847	-9999	-9999	-9,999	-1479.8% -9999,10675	-9999	-9999	-9999	-1638.7% -9999,10609
Day length	868	685	785	-1273.1% -9999,10784	878	777	848	-1179.5% -9999,10847	775	591	676	-1479.8% -9999,10675	683	579	610	-1638.7% -9999,10609

Day length

		Max day length	Min day length
Jan	599 min 9 h 59 min 599,841	621 min 10 h 21 min (Array.1.) 621,819	583 min 9 h 43 min (1.1.) 583,857
Feb	652 min 10 h 52 min 652,788	683 min 11 h 23 min (Array.2.) 683,757	623 min 10 h 23 min (1.2.) 623,817
Mar	720 min 11 h 60 min 720,720	755 min 12 h 35 min (Array.3.) 755,685	685 min 11 h 25 min (1.3.) 685,755
Apr	789 min 13 h 9 min 789,651	820 min 13 h 40 min (Array.4.) 820,620	757 min 12 h 37 min (1.4.) 757,683
May	847 min 14 h 7 min 847,593	868 min 14 h 28 min (Array.5.) 868,572	822 min 13 h 42 min (1.5.) 822,618
Jun	876 min 14 h 36 min 876,564	878 min 14 h 38 min (Array.6.) 878,562	869 min 14 h 29 min (1.6.) 869,571
Jul	860 min 14 h 20 min 860,580	875 min 14 h 35 min (Array.7.) 875,565	839 min 13 h 59 min (31.7.) 839,601
Aug	808 min 13 h 28 min 808,632	838 min 13 h 58 min (Array.8.) 838,602	777 min 12 h 57 min (31.8.) 777,663
Sep	742 min 12 h 22 min 742,698	775 min 12 h 55 min (Array.9.) 775,665	709 min 11 h 49 min (30.9.) 709,731
Oct	673 min 11 h 13 min 673,767	706 min 11 h 46 min (Array.10.) 706,734	640 min 10 h 40 min (31.10.) 640,800
Nov	613 min 10 h 13 min 613,827	638 min 10 h 38 min (Array.11.) 638,802	591 min 9 h 51 min (30.11.) 591,849
Dec	582 min 9 h 42 min 582,858	590 min 9 h 50 min (Array.12.) 590,850	579 min 9 h 39 min (21.12.) 579,861
Year	730 min 12 h 10 min 730,710	878 min 14 h 38 min (21. 6.) 878,562	579 min 9 h 39 min (22. 12.) 579,861

	Mar, Apr, May			Jun, Jul, Aug			Sep, Oct, Nov			Dec, Jan, Feb
	Max	Min	Average	Max	Min	Average	Max	Min	Average	Max	Min	Average
Day length	868	685	785	878	777	848	775	591	676	683	579	610

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