Lava Beds National Monument
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lava Beds National Monument clear sky chart from 2005-11-06 to 2024-01-15.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	4 5% 2 5% 5% 3 5% 5% 6% 8% 53%	74766
	Night	4 5% 2 5% 5% 3 5% 5% 6% 8% 53%	75020
Transparency	Day	30% 8% 11% 19% 20% 13%	74473
	Night	31% 9% 12% 20% 19% 9%	74834
Seeing	Day	8% 13% 22% 26% 22% 9%	13772
	Night	7% 9% 21% 36% 24% 3	23044

By Month

Percentage Cloud Cover SW (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	4 6% 3 7% 8% 5% 8% 8% 8% 12% 32%	1519
	11th to 20th	Day	5% 6% 3 6% 6% 4 6% 6% 9% 10% 40%	1504
	21st to end	Day	4 8% 3 8% 7% 4 6% 6% 7% 9% 40%	1782
February	1st to 10th	Day	3 7% 3 5% 5% 4 6% 5% 7% 10% 44%	1620
	11th to 20th	Day	3 6% 3 7% 5% 3 6% 5% 8% 8% 45%	1612
	21st to end	Day	2 8% 4 7% 8% 5% 7% 6% 7% 9% 38%	1480
March	1st to 10th	Day	3 8% 4 9% 8% 4 7% 7% 7% 10% 33%	1852
	11th to 20th	Day	4 9% 3 6% 7% 4 6% 6% 7% 9% 37%	1980
	21st to end	Day	4 8% 4 8% 8% 5% 7% 6% 7% 9% 35%	2256
April	1st to 10th	Day	5% 6% 5% 7% 8% 4 6% 6% 7% 8% 37%	2160
	11th to 20th	Day	6% 6% 4 6% 6% 3 5% 5% 6% 9% 44%	2129
	21st to end	Day	4 6% 2 5% 6% 4 5% 4 5% 9% 50%	2160
May	1st to 10th	Day	4 5% 3 4 5% 3 5% 4 6% 7% 54%	2419
	11th to 20th	Day	6% 6% 3 5% 5% 3 5% 5% 5% 9% 49%	2477
	21st to end	Day	7% 6% 3 6% 6% 4 5% 5% 6% 8% 45%	2723
June	1st to 10th	Day	7% 5% 3 5% 5% 3 5% 5% 6% 8% 48%	2520
	11th to 20th	Day	3 3 1 3 4 2 4 3 5% 8% 64%	2520
	21st to end	Day	3 2 1 2 3 2 2 3 4 6% 72%	2520
July	1st to 10th	Day	2 2 1 3 3 1 3 4 4 5% 73%	2520
	11th to 20th	Day	1 1 2 3 1 3 3 5% 4 77%	2520
	21st to end	Day	2 1 1 2 3 2 3 3 4 5% 75%	2679
August	1st to 10th	Day	1 2 1 2 3 2 4 5% 6% 8% 67%	2328
	11th to 20th	Day	2 1 1 2 2 2 2 3 4 5% 75%	2244
	21st to end	Day	2 1 1 1 1 2 2 3 4 81%	2376
September	1st to 10th	Day	1 1 1 2 1 2 3 3 4 82%	2160
	11th to 20th	Day	3 2 1 3 3 3 3 4 5% 5% 69%	2160
	21st to end	Day	3 3 1 4 3 2 2 3 5% 7% 68%	1926
October	1st to 10th	Day	6% 5% 2 4 4 2 3 3 3 6% 63%	1800
	11th to 20th	Day	4 3 1 3 3 3 4 5% 6% 7% 60%	1800
	21st to end	Day	4 5% 2 4 5% 3 5% 5% 6% 7% 54%	1963
November	1st to 10th	Day	6% 7% 3 7% 6% 3 5% 5% 5% 8% 44%	1674
	11th to 20th	Day	5% 6% 3 7% 6% 4 5% 7% 8% 11% 38%	1621
	21st to end	Day	4 4 3 7% 7% 5% 5% 6% 7% 10% 43%	1520
December	1st to 10th	Day	3 6% 3 6% 7% 4 6% 7% 7% 10% 42%	1520
	11th to 20th	Day	5% 7% 3 8% 9% 5% 8% 8% 8% 11% 27%	1928
	21st to end	Day	4 7% 4 9% 9% 5% 7% 7% 8% 11% 29%	2794
January	1st to 10th	Night	4 7% 3 6% 6% 5% 7% 6% 8% 10% 37%	2646
	11th to 20th	Night	3 6% 3 5% 5% 3 6% 7% 7% 10% 45%	2540
	21st to end	Night	3 7% 3 6% 6% 5% 5% 6% 6% 8% 44%	2574
February	1st to 10th	Night	3 5% 3 6% 6% 4 5% 6% 7% 10% 46%	2340
	11th to 20th	Night	4 6% 2 5% 6% 4 6% 7% 6% 8% 47%	2233
	21st to end	Night	2 5% 4 6% 7% 4 7% 7% 7% 11% 39%	1776
March	1st to 10th	Night	4 9% 5% 8% 7% 4 7% 6% 6% 9% 35%	2106
	11th to 20th	Night	4 7% 3 6% 6% 3 5% 6% 8% 11% 41%	1980
	21st to end	Night	3 8% 4 7% 7% 4 6% 6% 8% 9% 38%	2099
April	1st to 10th	Night	5% 7% 4 6% 6% 3 6% 6% 7% 9% 41%	1800
	11th to 20th	Night	4 7% 3 6% 4 3 5% 4 6% 7% 50%	1779
	21st to end	Night	6% 6% 3 5% 4 2 4 4 5% 9% 52%	1800
May	1st to 10th	Night	5% 5% 2 4 3 3 4 4 5% 7% 59%	1539
	11th to 20th	Night	7% 6% 2 4 5% 3 5% 5% 7% 8% 49%	1416
	21st to end	Night	7% 6% 2 5% 5% 4 4 4 5% 7% 51%	1552
June	1st to 10th	Night	6% 5% 2 5% 5% 2 3 4 6% 7% 53%	1440
	11th to 20th	Night	5% 2 1 3 3 3 4 4 4 5% 67%	1440
	21st to end	Night	3 1 1 3 2 2 2 3 3 5% 74%	1440
July	1st to 10th	Night	1 1 2 3 1 2 3 5% 5% 76%	1440
	11th to 20th	Night	2 1 1 2 2 1 2 2 3 3 81%	1440
	21st to end	Night	1 1 2 2 1 3 3 4 4 80%	1634
August	1st to 10th	Night	1 1 1 2 2 2 3 4 4 5% 74%	1611
	11th to 20th	Night	1 1 1 1 2 1 2 3 4 5% 78%	1656
	21st to end	Night	1 1 1 2 1 1 2 2 3 4 82%	1980
September	1st to 10th	Night	2 1 1 1 1 1 2 3 4 84%	1800
	11th to 20th	Night	3 2 1 3 2 1 3 4 4 6% 72%	1800
	21st to end	Night	2 3 1 3 3 2 3 3 5% 7% 68%	2030
October	1st to 10th	Night	4 4 1 3 4 2 3 3 3 6% 67%	2160
	11th to 20th	Night	3 3 1 3 4 2 3 4 4 8% 64%	2160
	21st to end	Night	4 5% 1 3 4 3 4 4 5% 8% 59%	2391
November	1st to 10th	Night	5% 7% 3 5% 5% 4 5% 6% 6% 8% 45%	2405
	11th to 20th	Night	6% 6% 3 5% 6% 3 6% 7% 8% 10% 41%	2555
	21st to end	Night	2 6% 3 6% 6% 4 5% 6% 6% 9% 48%	2660
December	1st to 10th	Night	4 6% 2 5% 6% 3 5% 5% 7% 11% 45%	2660
	11th to 20th	Night	5% 9% 4 8% 7% 4 7% 7% 7% 9% 33%	3276
	21st to end	Night	5% 11% 4 9% 7% 5% 6% 5% 6% 8% 34%	4862

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	46% 15% 17% 15% 6% 1	1519
	11th to 20th	Day	40% 13% 13% 16% 11% 7%	1504
	21st to end	Day	43% 9% 11% 20% 12% 5%	1782
February	1st to 10th	Day	38% 11% 14% 22% 13% 3	1620
	11th to 20th	Day	37% 14% 13% 20% 14% 2	1621
	21st to end	Day	44% 11% 15% 15% 10% 4	1480
March	1st to 10th	Day	48% 12% 12% 17% 9% 2	1852
	11th to 20th	Day	43% 11% 12% 15% 17% 1	1980
	21st to end	Day	49% 11% 17% 15% 7% 2	2256
April	1st to 10th	Day	47% 9% 13% 15% 13% 2	2160
	11th to 20th	Day	38% 8% 12% 23% 14% 4	2132
	21st to end	Day	34% 7% 15% 24% 17% 2	2160
May	1st to 10th	Day	29% 7% 12% 27% 21% 4	2419
	11th to 20th	Day	34% 7% 13% 24% 18% 4	2480
	21st to end	Day	38% 8% 13% 23% 14% 3	2724
June	1st to 10th	Day	33% 7% 13% 25% 18% 4	2520
	11th to 20th	Day	21% 5% 10% 25% 30% 8%	2520
	21st to end	Day	15% 4 6% 22% 31% 22%	2520
July	1st to 10th	Day	13% 3 5% 16% 28% 35%	2451
	11th to 20th	Day	11% 3 4 16% 29% 37%	2445
	21st to end	Day	14% 2 4 11% 25% 43%	2530
August	1st to 10th	Day	15% 5% 7% 18% 29% 27%	2312
	11th to 20th	Day	12% 2 6% 16% 33% 31%	2244
	21st to end	Day	10% 2 4 15% 36% 33%	2376
September	1st to 10th	Day	8% 2 5% 14% 29% 42%	2160
	11th to 20th	Day	17% 5% 8% 18% 33% 19%	2160
	21st to end	Day	18% 5% 9% 22% 28% 19%	1926
October	1st to 10th	Day	26% 4 10% 19% 25% 17%	1800
	11th to 20th	Day	23% 7% 11% 22% 27% 10%	1800
	21st to end	Day	28% 11% 12% 19% 20% 11%	1963
November	1st to 10th	Day	41% 9% 12% 18% 17% 4	1674
	11th to 20th	Day	40% 12% 14% 18% 14% 2	1621
	21st to end	Day	38% 11% 12% 18% 16% 6%	1520
December	1st to 10th	Day	38% 13% 11% 20% 15% 4	1520
	11th to 20th	Day	49% 15% 14% 13% 8% 1	1928
	21st to end	Day	46% 16% 15% 17% 6% 1	2794
January	1st to 10th	Night	43% 16% 16% 16% 7% 2	2646
	11th to 20th	Night	35% 15% 14% 16% 12% 8%	2540
	21st to end	Night	39% 12% 9% 19% 17% 3	2574
February	1st to 10th	Night	35% 11% 14% 22% 14% 3	2340
	11th to 20th	Night	35% 13% 14% 19% 15% 3	2235
	21st to end	Night	39% 12% 16% 16% 13% 4	1776
March	1st to 10th	Night	46% 13% 14% 15% 11% 2	2106
	11th to 20th	Night	38% 13% 13% 18% 16% 1	1980
	21st to end	Night	43% 14% 18% 17% 8% 1	2099
April	1st to 10th	Night	41% 11% 16% 20% 10% 2	1800
	11th to 20th	Night	33% 11% 17% 22% 13% 5%	1779
	21st to end	Night	31% 7% 19% 27% 13% 2	1800
May	1st to 10th	Night	26% 8% 14% 27% 22% 3	1539
	11th to 20th	Night	32% 10% 13% 25% 15% 4	1416
	21st to end	Night	33% 7% 18% 28% 12% 1	1552
June	1st to 10th	Night	31% 7% 18% 30% 13% 1	1440
	11th to 20th	Night	20% 5% 11% 30% 27% 6%	1440
	21st to end	Night	15% 4 7% 26% 35% 14%	1440
July	1st to 10th	Night	11% 3 8% 20% 30% 28%	1400
	11th to 20th	Night	10% 3 4 18% 31% 34%	1392
	21st to end	Night	9% 3 5% 14% 32% 36%	1543
August	1st to 10th	Night	13% 4 7% 24% 28% 24%	1602
	11th to 20th	Night	10% 3 6% 20% 36% 25%	1656
	21st to end	Night	8% 2 6% 20% 35% 29%	1980
September	1st to 10th	Night	8% 2 5% 16% 28% 41%	1800
	11th to 20th	Night	14% 5% 8% 22% 31% 20%	1800
	21st to end	Night	17% 6% 9% 21% 24% 23%	2030
October	1st to 10th	Night	21% 5% 9% 21% 29% 15%	2160
	11th to 20th	Night	20% 7% 12% 22% 27% 12%	2160
	21st to end	Night	24% 8% 14% 22% 19% 12%	2391
November	1st to 10th	Night	39% 10% 12% 18% 16% 6%	2405
	11th to 20th	Night	38% 12% 14% 17% 15% 3	2555
	21st to end	Night	35% 11% 14% 15% 18% 6%	2660
December	1st to 10th	Night	36% 11% 12% 19% 18% 3	2660
	11th to 20th	Night	48% 13% 9% 18% 11% 1	3276
	21st to end	Night	48% 12% 12% 17% 9% 1	4862

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	13% 22% 29% 26% 7% 3	180
	11th to 20th	Day	14% 22% 22% 23% 12% 8%	200
	21st to end	Day	8% 16% 23% 25% 19% 9%	374
February	1st to 10th	Day	10% 18% 23% 23% 22% 4	340
	11th to 20th	Day	11% 22% 23% 24% 16% 3	352
	21st to end	Day	8% 21% 30% 25% 15% 1	346
March	1st to 10th	Day	11% 28% 30% 17% 11% 1	420
	11th to 20th	Day	13% 19% 26% 23% 17% 2	420
	21st to end	Day	15% 21% 26% 23% 13% 2	462
April	1st to 10th	Day	12% 26% 25% 23% 11% 3	420
	11th to 20th	Day	14% 22% 23% 21% 13% 7%	412
	21st to end	Day	5% 21% 27% 24% 16% 7%	420
May	1st to 10th	Day	10% 16% 28% 25% 17% 4	423
	11th to 20th	Day	13% 17% 23% 23% 16% 8%	448
	21st to end	Day	10% 12% 20% 26% 22% 11%	485
June	1st to 10th	Day	8% 13% 18% 26% 23% 12%	450
	11th to 20th	Day	6% 16% 25% 23% 21% 8%	450
	21st to end	Day	2 6% 19% 30% 28% 16%	450
July	1st to 10th	Day	3 3 20% 36% 26% 12%	446
	11th to 20th	Day	1 3 19% 31% 32% 14%	444
	21st to end	Day	2 3 13% 31% 36% 15%	487
August	1st to 10th	Day	1 1 20% 30% 31% 17%	447
	11th to 20th	Day	1 5% 15% 28% 31% 20%	437
	21st to end	Day	3 4 19% 30% 29% 16%	495
September	1st to 10th	Day	1 4 19% 28% 35% 12%	450
	11th to 20th	Day	4 7% 21% 29% 26% 12%	450
	21st to end	Day	5% 9% 22% 29% 30% 6%	450
October	1st to 10th	Day	9% 11% 20% 24% 25% 12%	450
	11th to 20th	Day	6% 15% 15% 26% 28% 10%	450
	21st to end	Day	8% 14% 21% 27% 19% 11%	478
November	1st to 10th	Day	11% 16% 18% 29% 19% 7%	270
	11th to 20th	Day	11% 12% 18% 25% 28% 7%	228
	21st to end	Day	8% 10% 21% 25% 31% 5%	180
December	1st to 10th	Day	11% 17% 21% 25% 18% 9%	180
	11th to 20th	Day	14% 21% 15% 23% 19% 7%	180
	21st to end	Day	12% 16% 25% 25% 21% 1	198
January	1st to 10th	Night	11% 12% 26% 30% 17% 3	760
	11th to 20th	Night	7% 18% 23% 29% 19% 3	736
	21st to end	Night	8% 10% 26% 33% 20% 4	792
February	1st to 10th	Night	6% 11% 28% 34% 20% 1	720
	11th to 20th	Night	9% 12% 25% 33% 18% 2	704
	21st to end	Night	5% 16% 29% 36% 12% 1	592
March	1st to 10th	Night	10% 17% 30% 27% 13% 3	720
	11th to 20th	Night	10% 13% 23% 34% 18% 2	720
	21st to end	Night	8% 18% 30% 30% 15%	792
April	1st to 10th	Night	9% 12% 29% 34% 13% 2	720
	11th to 20th	Night	8% 12% 30% 30% 17% 3	711
	21st to end	Night	9% 10% 26% 34% 19% 2	720
May	1st to 10th	Night	7% 8% 29% 34% 20% 2	459
	11th to 20th	Night	12% 5% 23% 36% 21% 3	354
	21st to end	Night	11% 6% 23% 37% 22% 1	389
June	1st to 10th	Night	8% 6% 19% 40% 26% 1	360
	11th to 20th	Night	5% 6% 27% 44% 18% 1	360
	21st to end	Night	4 14% 54% 28%	360
July	1st to 10th	Night	2 11% 54% 31% 1	350
	11th to 20th	Night	1 11% 57% 30%	348
	21st to end	Night	1 5% 50% 41% 3	452
August	1st to 10th	Night	1 6% 43% 47% 3	537
	11th to 20th	Night	2 1 7% 44% 41% 5%	588
	21st to end	Night	2 2 11% 43% 39% 3	792
September	1st to 10th	Night	2 2 13% 41% 39% 3	720
	11th to 20th	Night	4 2 14% 36% 38% 6%	720
	21st to end	Night	5% 4 16% 36% 33% 6%	720
October	1st to 10th	Night	5% 3 22% 34% 30% 5%	720
	11th to 20th	Night	5% 7% 17% 34% 32% 5%	720
	21st to end	Night	7% 7% 18% 35% 26% 7%	792
November	1st to 10th	Night	10% 9% 19% 37% 20% 5%	740
	11th to 20th	Night	10% 13% 22% 33% 19% 3	760
	21st to end	Night	6% 14% 20% 33% 24% 3	760
December	1st to 10th	Night	10% 11% 23% 31% 22% 3	760
	11th to 20th	Night	9% 18% 21% 31% 18% 3	760
	21st to end	Night	11% 17% 29% 33% 9% 1	836

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