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 2024-11-30.

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	3 5% 2 5% 4 4 4 4 6% 7% 56%	105569
	Night	3 6% 2 5% 4 4 4 4 6% 7% 55%	102742
Transparency	Day	27% 8% 10% 19% 20% 16%	105316
	Night	29% 9% 11% 20% 19% 12%	102584
Seeing	Day	8% 13% 21% 26% 22% 9%	14970
	Night	7% 9% 22% 36% 24% 3	24136

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 9% 4 8% 7% 6% 7% 6% 8% 11% 30%	2539
	11th to 20th	Day	7% 12% 4 10% 8% 7% 5% 4 8% 9% 27%	2600
	21st to end	Day	6% 10% 3 10% 7% 6% 6% 5% 6% 8% 34%	3146
February	1st to 10th	Day	3 9% 3 7% 5% 6% 5% 5% 7% 10% 42%	1710
	11th to 20th	Day	3 7% 2 7% 5% 5% 5% 5% 8% 8% 43%	1704
	21st to end	Day	2 9% 3 7% 7% 7% 6% 5% 6% 9% 38%	1570
March	1st to 10th	Day	2 9% 3 9% 7% 7% 8% 6% 9% 9% 31%	3229
	11th to 20th	Day	3 7% 2 5% 5% 4 4 3 6% 6% 56%	3490
	21st to end	Day	3 9% 4 11% 7% 7% 7% 5% 8% 9% 31%	3967
April	1st to 10th	Day	5% 8% 3 9% 6% 6% 6% 4 7% 8% 38%	2280
	11th to 20th	Day	6% 7% 3 7% 5% 5% 5% 4 6% 9% 44%	2249
	21st to end	Day	4 6% 2 6% 5% 5% 4 3 6% 9% 49%	2280
May	1st to 10th	Day	3 6% 2 5% 4 4 4 3 5% 6% 59%	4254
	11th to 20th	Day	3 4 1 4 3 3 3 3 4 6% 66%	4377
	21st to end	Day	4 4 2 5% 4 4 4 4 5% 8% 58%	4813
June	1st to 10th	Day	7% 5% 2 5% 5% 4 5% 4 7% 8% 47%	2660
	11th to 20th	Day	3 3 1 4 3 3 3 3 5% 7% 64%	2660
	21st to end	Day	3 2 1 3 2 2 2 3 4 5% 73%	2660
July	1st to 10th	Day	1 1 2 1 1 1 2 2 3 85%	4420
	11th to 20th	Day	1 2 1 3 2 3 3 3 4 4 74%	4420
	21st to end	Day	1 1 1 2 2 2 2 2 4 4 79%	4679
August	1st to 10th	Day	2 2 1 3 3 3 4 3 6% 6% 68%	4091
	11th to 20th	Day	1 1 2 2 2 2 2 4 6% 78%	3933
	21st to end	Day	1 2 1 2 2 2 2 2 3 4 79%	4180
September	1st to 10th	Day	1 1 1 2 2 2 2 3 5% 81%	2280
	11th to 20th	Day	3 2 1 3 3 3 3 3 5% 5% 68%	2280
	21st to end	Day	3 3 1 4 2 2 2 3 5% 7% 69%	2032
October	1st to 10th	Day	3 3 1 3 2 2 3 2 3 5% 73%	3180
	11th to 20th	Day	3 3 1 4 3 3 4 3 6% 8% 62%	3161
	21st to end	Day	4 6% 2 5% 4 5% 5% 4 7% 9% 50%	3418
November	1st to 10th	Day	6% 7% 3 7% 5% 4 5% 4 6% 9% 44%	1764
	11th to 20th	Day	5% 7% 2 8% 6% 5% 5% 6% 8% 10% 37%	1706
	21st to end	Day	4 6% 2 8% 6% 6% 5% 5% 7% 10% 43%	1595
December	1st to 10th	Day	3 7% 2 7% 6% 5% 6% 5% 7% 10% 42%	1520
	11th to 20th	Day	5% 8% 3 10% 7% 8% 7% 7% 8% 10% 27%	1928
	21st to end	Day	3 8% 4 11% 7% 7% 7% 6% 8% 11% 29%	2794
January	1st to 10th	Night	3 8% 3 8% 6% 6% 7% 6% 10% 11% 33%	4406
	11th to 20th	Night	4 9% 3 8% 5% 5% 6% 5% 7% 9% 39%	4358
	21st to end	Night	8% 13% 4 10% 6% 6% 5% 4 5% 7% 31%	4521
February	1st to 10th	Night	2 6% 3 8% 6% 5% 4 5% 8% 10% 44%	2470
	11th to 20th	Night	4 7% 2 6% 5% 5% 6% 5% 7% 8% 45%	2361
	21st to end	Night	2 6% 3 7% 6% 6% 7% 5% 8% 11% 40%	1884
March	1st to 10th	Night	3 9% 4 7% 6% 6% 6% 6% 8% 10% 35%	3643
	11th to 20th	Night	2 6% 2 5% 4 3 4 4 6% 8% 57%	3490
	21st to end	Night	2 9% 3 10% 7% 6% 8% 5% 8% 9% 32%	3685
April	1st to 10th	Night	5% 8% 3 7% 6% 5% 5% 5% 7% 9% 42%	1900
	11th to 20th	Night	4 8% 2 6% 4 3 6% 3 6% 7% 51%	1879
	21st to end	Night	6% 7% 2 6% 4 3 4 3 5% 8% 52%	1900
May	1st to 10th	Night	3 6% 2 4 4 4 3 3 5% 7% 60%	2709
	11th to 20th	Night	4 3 1 3 3 2 3 3 5% 5% 69%	2516
	21st to end	Night	4 4 1 3 3 3 3 2 4 7% 66%	2762
June	1st to 10th	Night	6% 6% 2 6% 5% 4 3 5% 6% 7% 52%	1520
	11th to 20th	Night	4 2 1 3 2 4 3 3 4 5% 69%	1520
	21st to end	Night	3 1 1 3 2 2 2 3 3 5% 75%	1520
July	1st to 10th	Night	1 1 1 1 1 2 3 3 86%	2540
	11th to 20th	Night	2 2 1 3 2 2 2 2 3 3 78%	2540
	21st to end	Night	1 1 1 1 2 2 3 4 84%	2872
August	1st to 10th	Night	2 2 1 3 2 2 3 2 4 5% 74%	2848
	11th to 20th	Night	1 1 1 1 1 2 2 4 5% 83%	2908
	21st to end	Night	2 3 1 2 1 1 2 1 2 3 82%	3498
September	1st to 10th	Night	2 1 2 1 1 2 1 3 3 84%	1900
	11th to 20th	Night	3 2 1 3 2 2 3 3 4 6% 71%	1900
	21st to end	Night	2 3 1 3 2 3 3 3 5% 7% 69%	2144
October	1st to 10th	Night	2 3 1 2 2 2 3 3 3 4 77%	3800
	11th to 20th	Night	4 4 1 4 3 2 3 3 4 6% 67%	3777
	21st to end	Night	2 4 1 4 4 4 6% 4 7% 9% 56%	4148
November	1st to 10th	Night	5% 8% 2 6% 4 5% 5% 5% 7% 8% 45%	2535
	11th to 20th	Night	6% 7% 2 7% 5% 5% 6% 5% 8% 9% 41%	2690
	21st to end	Night	2 6% 3 7% 5% 5% 4 5% 6% 9% 48%	2800
December	1st to 10th	Night	4 7% 2 5% 5% 5% 4 4 8% 10% 45%	2660
	11th to 20th	Night	5% 9% 4 9% 7% 5% 7% 6% 7% 9% 33%	3276
	21st to end	Night	5% 12% 3 10% 6% 6% 5% 4 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	48% 16% 15% 16% 5%	2539
	11th to 20th	Day	56% 11% 11% 11% 7% 4	2600
	21st to end	Day	49% 11% 14% 16% 7% 3	3146
February	1st to 10th	Day	39% 11% 14% 21% 12% 2	1710
	11th to 20th	Day	38% 14% 12% 20% 14% 2	1713
	21st to end	Day	43% 12% 15% 16% 11% 3	1570
March	1st to 10th	Day	48% 18% 10% 15% 8% 1	3229
	11th to 20th	Day	32% 9% 11% 24% 23% 1	3490
	21st to end	Day	49% 14% 13% 18% 5% 1	3967
April	1st to 10th	Day	46% 9% 14% 17% 13% 2	2280
	11th to 20th	Day	38% 8% 12% 24% 13% 4	2252
	21st to end	Day	34% 8% 15% 24% 17% 2	2280
May	1st to 10th	Day	26% 8% 10% 28% 25% 4	4254
	11th to 20th	Day	20% 5% 8% 20% 37% 11%	4380
	21st to end	Day	25% 7% 14% 31% 21% 2	4814
June	1st to 10th	Day	33% 7% 13% 25% 18% 4	2660
	11th to 20th	Day	20% 5% 10% 25% 31% 9%	2660
	21st to end	Day	15% 4 6% 22% 32% 22%	2660
July	1st to 10th	Day	8% 2 3 9% 16% 62%	4351
	11th to 20th	Day	13% 3 4 10% 19% 50%	4345
	21st to end	Day	11% 2 4 12% 27% 44%	4531
August	1st to 10th	Day	15% 4 5% 11% 19% 46%	4076
	11th to 20th	Day	8% 3 6% 16% 41% 26%	3972
	21st to end	Day	10% 3 4 21% 34% 28%	4179
September	1st to 10th	Day	8% 2 5% 13% 29% 43%	2280
	11th to 20th	Day	18% 5% 8% 18% 33% 18%	2280
	21st to end	Day	17% 4 9% 22% 29% 19%	2032
October	1st to 10th	Day	17% 3 8% 14% 27% 31%	3180
	11th to 20th	Day	19% 7% 9% 32% 27% 6%	3161
	21st to end	Day	27% 11% 12% 23% 21% 7%	3418
November	1st to 10th	Day	39% 9% 13% 19% 16% 4	1764
	11th to 20th	Day	40% 12% 14% 17% 14% 2	1706
	21st to end	Day	37% 12% 11% 18% 16% 6%	1595
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% 17% 17% 17% 5% 1	4406
	11th to 20th	Night	45% 14% 13% 14% 10% 4	4358
	21st to end	Night	53% 13% 8% 14% 10% 2	4521
February	1st to 10th	Night	36% 12% 15% 21% 13% 3	2470
	11th to 20th	Night	36% 13% 14% 19% 14% 3	2363
	21st to end	Night	39% 12% 17% 17% 12% 4	1884
March	1st to 10th	Night	44% 16% 12% 17% 9% 1	3643
	11th to 20th	Night	29% 11% 11% 26% 23% 1	3490
	21st to end	Night	45% 17% 15% 16% 7% 1	3685
April	1st to 10th	Night	40% 11% 17% 20% 10% 2	1900
	11th to 20th	Night	32% 11% 18% 23% 12% 5%	1879
	21st to end	Night	30% 8% 20% 27% 13% 2	1900
May	1st to 10th	Night	25% 8% 13% 30% 20% 4	2709
	11th to 20th	Night	19% 6% 9% 24% 34% 9%	2516
	21st to end	Night	20% 7% 19% 38% 15% 1	2762
June	1st to 10th	Night	31% 8% 18% 30% 13% 1	1520
	11th to 20th	Night	19% 5% 11% 30% 28% 7%	1520
	21st to end	Night	14% 3 7% 26% 36% 14%	1520
July	1st to 10th	Night	6% 2 4 11% 19% 57%	2500
	11th to 20th	Night	12% 3 3 11% 20% 51%	2492
	21st to end	Night	6% 2 5% 13% 34% 40%	2782
August	1st to 10th	Night	13% 3 5% 14% 21% 44%	2839
	11th to 20th	Night	6% 2 5% 22% 42% 23%	2935
	21st to end	Night	10% 2 4 30% 27% 26%	3498
September	1st to 10th	Night	8% 2 5% 15% 28% 43%	1900
	11th to 20th	Night	15% 5% 8% 23% 30% 19%	1900
	21st to end	Night	16% 6% 9% 21% 25% 23%	2144
October	1st to 10th	Night	14% 4 6% 14% 33% 29%	3800
	11th to 20th	Night	20% 6% 9% 35% 23% 7%	3777
	21st to end	Night	22% 11% 11% 24% 23% 8%	4148
November	1st to 10th	Night	38% 10% 13% 18% 16% 5%	2535
	11th to 20th	Night	38% 12% 14% 18% 15% 3	2690
	21st to end	Night	34% 11% 14% 15% 19% 7%	2800
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	16% 23% 21% 21% 12% 7%	214
	21st to end	Day	9% 17% 23% 25% 18% 8%	407
February	1st to 10th	Day	10% 20% 22% 24% 20% 4	370
	11th to 20th	Day	12% 22% 23% 24% 15% 3	384
	21st to end	Day	9% 19% 30% 24% 16% 2	382
March	1st to 10th	Day	13% 27% 30% 18% 11% 1	460
	11th to 20th	Day	12% 19% 26% 23% 18% 3	460
	21st to end	Day	14% 23% 27% 22% 12% 1	506
April	1st to 10th	Day	11% 25% 24% 23% 12% 4	460
	11th to 20th	Day	14% 21% 23% 21% 14% 7%	452
	21st to end	Day	5% 20% 27% 24% 17% 8%	460
May	1st to 10th	Day	11% 16% 29% 24% 16% 4	463
	11th to 20th	Day	12% 15% 22% 25% 16% 10%	488
	21st to end	Day	9% 12% 20% 25% 23% 11%	529
June	1st to 10th	Day	7% 13% 19% 26% 24% 11%	490
	11th to 20th	Day	6% 15% 26% 24% 21% 8%	490
	21st to end	Day	2 7% 19% 30% 28% 15%	490
July	1st to 10th	Day	3 3 19% 35% 28% 12%	486
	11th to 20th	Day	1 3 18% 31% 33% 14%	484
	21st to end	Day	2 3 13% 31% 35% 15%	531
August	1st to 10th	Day	2 1 19% 31% 31% 16%	487
	11th to 20th	Day	1 5% 17% 29% 30% 19%	477
	21st to end	Day	3 4 19% 29% 29% 16%	539
September	1st to 10th	Day	1 4 19% 28% 35% 13%	490
	11th to 20th	Day	5% 7% 20% 30% 26% 12%	490
	21st to end	Day	5% 8% 21% 28% 30% 8%	490
October	1st to 10th	Day	8% 10% 19% 25% 27% 12%	490
	11th to 20th	Day	6% 15% 15% 25% 28% 10%	490
	21st to end	Day	8% 15% 21% 28% 19% 10%	521
November	1st to 10th	Day	11% 16% 19% 29% 19% 7%	300
	11th to 20th	Day	13% 13% 19% 25% 25% 6%	253
	21st to end	Day	10% 10% 22% 23% 30% 6%	199
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% 24% 29% 19% 3	760
	21st to end	Night	9% 11% 26% 33% 19% 3	836
February	1st to 10th	Night	6% 11% 28% 34% 19% 1	760
	11th to 20th	Night	10% 14% 24% 33% 17% 2	744
	21st to end	Night	5% 16% 29% 36% 13% 1	628
March	1st to 10th	Night	10% 18% 30% 27% 13% 3	760
	11th to 20th	Night	10% 12% 24% 34% 18% 2	760
	21st to end	Night	8% 18% 31% 30% 14%	836
April	1st to 10th	Night	9% 12% 30% 35% 14% 2	760
	11th to 20th	Night	9% 11% 31% 30% 17% 3	751
	21st to end	Night	9% 10% 27% 34% 18% 2	760
May	1st to 10th	Night	7% 8% 30% 34% 20% 1	484
	11th to 20th	Night	11% 5% 23% 37% 22% 2	374
	21st to end	Night	10% 6% 24% 38% 22% 1	411
June	1st to 10th	Night	8% 6% 18% 41% 26% 1	380
	11th to 20th	Night	5% 6% 28% 44% 17% 1	380
	21st to end	Night	4 1 14% 54% 27%	380
July	1st to 10th	Night	2 12% 54% 31% 1	370
	11th to 20th	Night	1 11% 57% 30%	368
	21st to end	Night	1 5% 51% 40% 3	478
August	1st to 10th	Night	1 6% 44% 46% 3	567
	11th to 20th	Night	1 1 8% 45% 40% 5%	621
	21st to end	Night	2 2 12% 42% 39% 3	836
September	1st to 10th	Night	2 2 13% 42% 39% 3	760
	11th to 20th	Night	5% 3 15% 36% 37% 6%	760
	21st to end	Night	4 4 16% 37% 33% 6%	760
October	1st to 10th	Night	5% 3 21% 35% 31% 5%	760
	11th to 20th	Night	5% 7% 17% 33% 32% 5%	760
	21st to end	Night	7% 8% 19% 36% 25% 6%	836
November	1st to 10th	Night	10% 9% 20% 36% 20% 5%	780
	11th to 20th	Night	11% 13% 23% 32% 19% 3	800
	21st to end	Night	7% 14% 20% 32% 24% 4	800
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

Page generated at 2024-11-27 14:30:52. Version ac07

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