Craters Of The Moon National Monument
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Craters Of The Moon National Monument clear sky chart from 2005-11-06 to 2024-11-10.

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 6% 4 4 5% 4 6% 7% 54%	104954
	Night	3 6% 2 6% 5% 4 5% 4 6% 8% 51%	102865
Transparency	Day	29% 5% 11% 22% 20% 13%	104702
	Night	32% 6% 11% 21% 19% 11%	102706
Seeing	Day	6% 9% 26% 32% 21% 5%	14946
	Night	7% 5% 23% 42% 21% 3	24531

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	2 7% 6% 12% 9% 8% 7% 6% 7% 8% 28%	2539
	11th to 20th	Day	2 6% 3 10% 9% 7% 7% 5% 7% 9% 35%	2540
	21st to end	Day	5% 17% 5% 12% 5% 5% 5% 4 5% 7% 32%	2982
February	1st to 10th	Day	2 6% 4 8% 5% 5% 7% 7% 9% 9% 38%	1710
	11th to 20th	Day	2 8% 3 10% 7% 5% 6% 6% 8% 9% 35%	1763
	21st to end	Day	2 5% 4 9% 6% 6% 7% 6% 8% 9% 39%	1570
March	1st to 10th	Day	2 6% 3 7% 6% 5% 7% 5% 7% 8% 44%	3193
	11th to 20th	Day	2 7% 2 6% 5% 4 4 3 4 5% 57%	3490
	21st to end	Day	4 10% 3 10% 7% 7% 7% 6% 7% 9% 30%	3825
April	1st to 10th	Day	3 8% 2 8% 6% 5% 5% 5% 8% 8% 42%	2213
	11th to 20th	Day	4 6% 3 6% 5% 5% 6% 5% 6% 7% 47%	2411
	21st to end	Day	6% 7% 2 6% 4 5% 5% 4 7% 8% 46%	2470
May	1st to 10th	Day	4 8% 4 8% 6% 4 5% 4 6% 8% 44%	4110
	11th to 20th	Day	4 4 2 5% 4 3 4 3 5% 7% 59%	4071
	21st to end	Day	5% 4 2 6% 5% 5% 4 4 7% 8% 51%	4594
June	1st to 10th	Day	4 4 2 6% 5% 5% 5% 5% 8% 8% 48%	2845
	11th to 20th	Day	4 4 2 6% 4 4 4 4 5% 8% 56%	2850
	21st to end	Day	1 1 1 3 3 3 3 3 4 7% 71%	2816
July	1st to 10th	Day	1 1 1 2 2 2 2 4 5% 78%	4420
	11th to 20th	Day	2 2 1 3 2 3 3 3 4 6% 70%	4420
	21st to end	Day	3 3 1 3 2 3 4 3 5% 7% 66%	4621
August	1st to 10th	Day	3 3 1 4 3 4 4 4 6% 8% 61%	4092
	11th to 20th	Day	2 1 2 2 3 4 4 6% 6% 71%	4028
	21st to end	Day	2 3 1 3 2 2 2 2 4 5% 73%	4493
September	1st to 10th	Day	2 2 1 3 2 3 2 2 4 5% 72%	2180
	11th to 20th	Day	3 4 2 4 3 2 3 3 5% 7% 63%	2090
	21st to end	Day	5% 4 2 4 2 2 2 3 4 6% 66%	2090
October	1st to 10th	Day	4 3 1 4 3 3 4 3 4 5% 66%	3426
	11th to 20th	Day	2 4 2 5% 3 3 3 3 5% 6% 65%	3150
	21st to end	Day	2 3 2 5% 4 4 4 4 7% 9% 56%	3136
November	1st to 10th	Day	3 6% 3 6% 5% 5% 5% 4 6% 8% 48%	1755
	11th to 20th	Day	2 5% 2 5% 5% 5% 6% 5% 9% 9% 45%	1710
	21st to end	Day	3 7% 3 8% 5% 4 6% 5% 6% 8% 47%	1544
December	1st to 10th	Day	3 8% 4 9% 7% 7% 6% 5% 5% 7% 38%	1511
	11th to 20th	Day	3 10% 3 10% 8% 7% 7% 5% 7% 8% 33%	1685
	21st to end	Day	4 7% 4 10% 6% 5% 5% 4 6% 8% 41%	2611
January	1st to 10th	Night	3 9% 4 11% 6% 6% 6% 5% 7% 8% 35%	4406
	11th to 20th	Night	2 10% 4 12% 8% 8% 6% 4 6% 7% 32%	4420
	21st to end	Night	6% 18% 5% 10% 5% 4 4 4 5% 7% 31%	4677
February	1st to 10th	Night	4 8% 3 8% 6% 6% 6% 6% 9% 10% 36%	2470
	11th to 20th	Night	4 7% 3 7% 6% 5% 6% 5% 6% 10% 42%	2301
	21st to end	Night	2 7% 3 8% 6% 7% 6% 5% 8% 9% 39%	1884
March	1st to 10th	Night	2 9% 2 7% 6% 6% 6% 4 7% 8% 43%	3679
	11th to 20th	Night	2 4 1 4 4 4 4 4 5% 8% 61%	3490
	21st to end	Night	4 7% 4 9% 6% 6% 5% 5% 7% 10% 38%	3828
April	1st to 10th	Night	4 8% 2 6% 4 4 4 4 8% 9% 46%	1965
	11th to 20th	Night	4 7% 2 7% 4 5% 5% 4 7% 7% 48%	1715
	21st to end	Night	4 7% 2 6% 3 5% 4 4 6% 9% 52%	1710
May	1st to 10th	Night	6% 9% 3 5% 4 4 4 3 5% 7% 50%	2860
	11th to 20th	Night	3 4 2 4 3 4 4 4 6% 8% 59%	2834
	21st to end	Night	6% 5% 2 6% 4 3 4 4 7% 8% 51%	2984
June	1st to 10th	Night	4 3 1 5% 4 6% 6% 5% 6% 10% 49%	1330
	11th to 20th	Night	4 3 1 5% 4 4 4 3 5% 8% 57%	1330
	21st to end	Night	2 1 1 3 3 4 3 3 4 5% 69%	1357
July	1st to 10th	Night	1 1 1 2 2 2 3 2 4 5% 78%	2540
	11th to 20th	Night	1 1 1 2 2 3 3 3 6% 9% 70%	2540
	21st to end	Night	1 2 2 4 3 3 4 3 5% 7% 66%	2934
August	1st to 10th	Night	2 3 1 4 4 5% 4 5% 7% 7% 59%	2847
	11th to 20th	Night	1 2 1 3 3 3 4 3 4 6% 70%	2811
	21st to end	Night	2 2 1 3 3 2 4 3 5% 4 71%	3172
September	1st to 10th	Night	2 2 1 4 2 2 3 3 4 5% 71%	2000
	11th to 20th	Night	4 3 1 3 3 3 4 3 4 7% 64%	2090
	21st to end	Night	6% 2 1 3 3 2 2 3 4 5% 67%	2090
October	1st to 10th	Night	4 2 1 3 3 2 3 2 4 6% 71%	3551
	11th to 20th	Night	4 5% 2 5% 3 3 5% 3 4 6% 59%	3778
	21st to end	Night	2 4 2 5% 4 5% 6% 4 6% 9% 53%	4418
November	1st to 10th	Night	5% 5% 2 6% 4 5% 4 4 6% 8% 50%	2528
	11th to 20th	Night	2 5% 2 7% 5% 5% 5% 6% 7% 9% 48%	2470
	21st to end	Night	3 5% 2 6% 5% 5% 6% 5% 7% 9% 49%	2614
December	1st to 10th	Night	2 7% 4 10% 6% 5% 5% 6% 7% 9% 40%	2664
	11th to 20th	Night	4 11% 4 9% 7% 7% 6% 5% 7% 9% 32%	3506
	21st to end	Night	3 9% 4 9% 6% 5% 7% 4 6% 7% 40%	5072

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	53% 8% 15% 19% 6% 1	2539
	11th to 20th	Day	48% 7% 17% 19% 8% 2	2540
	21st to end	Day	55% 7% 16% 16% 5% 1	2982
February	1st to 10th	Day	39% 10% 20% 24% 6% 2	1710
	11th to 20th	Day	43% 8% 19% 20% 9% 1	1772
	21st to end	Day	40% 10% 16% 24% 8% 2	1570
March	1st to 10th	Day	38% 7% 18% 26% 11% 1	3193
	11th to 20th	Day	31% 5% 12% 37% 15% 1	3490
	21st to end	Day	47% 7% 18% 20% 6% 1	3825
April	1st to 10th	Day	37% 7% 18% 22% 14% 2	2213
	11th to 20th	Day	35% 6% 13% 27% 18% 2	2414
	21st to end	Day	35% 4 12% 30% 18% 1	2470
May	1st to 10th	Day	35% 5% 8% 26% 22% 3	4110
	11th to 20th	Day	23% 4 7% 34% 23% 9%	4074
	21st to end	Day	29% 4 10% 33% 20% 3	4594
June	1st to 10th	Day	30% 4 14% 28% 21% 2	2845
	11th to 20th	Day	26% 4 10% 20% 25% 15%	2850
	21st to end	Day	15% 3 4 20% 37% 21%	2816
July	1st to 10th	Day	9% 2 2 10% 25% 53%	4351
	11th to 20th	Day	14% 4 2 8% 22% 50%	4345
	21st to end	Day	17% 3 3 11% 30% 36%	4475
August	1st to 10th	Day	21% 4 4 13% 30% 29%	4078
	11th to 20th	Day	12% 4 3 20% 36% 26%	4067
	21st to end	Day	15% 2 4 18% 29% 32%	4492
September	1st to 10th	Day	16% 3 5% 17% 33% 27%	2180
	11th to 20th	Day	21% 3 9% 26% 28% 13%	2090
	21st to end	Day	21% 2 7% 28% 29% 12%	2090
October	1st to 10th	Day	22% 3 8% 18% 36% 13%	3426
	11th to 20th	Day	21% 3 9% 37% 20% 11%	3150
	21st to end	Day	23% 7% 16% 30% 23% 2	3136
November	1st to 10th	Day	36% 5% 18% 22% 17% 1	1755
	11th to 20th	Day	33% 9% 21% 27% 7% 2	1710
	21st to end	Day	36% 6% 19% 25% 12% 2	1544
December	1st to 10th	Day	47% 9% 15% 20% 7% 2	1511
	11th to 20th	Day	51% 6% 18% 21% 4	1684
	21st to end	Day	42% 6% 17% 18% 15% 2	2611
January	1st to 10th	Night	47% 9% 12% 21% 10% 1	4406
	11th to 20th	Night	54% 6% 12% 15% 11% 2	4420
	21st to end	Night	55% 6% 16% 15% 7% 1	4677
February	1st to 10th	Night	43% 9% 18% 21% 7% 2	2470
	11th to 20th	Night	38% 8% 17% 24% 10% 2	2302
	21st to end	Night	39% 7% 18% 23% 10% 3	1884
March	1st to 10th	Night	39% 7% 15% 22% 16% 1	3679
	11th to 20th	Night	24% 5% 15% 32% 22% 2	3490
	21st to end	Night	39% 8% 17% 29% 6% 1	3828
April	1st to 10th	Night	33% 7% 15% 25% 17% 4	1965
	11th to 20th	Night	35% 6% 10% 28% 19% 2	1715
	21st to end	Night	30% 4 11% 31% 22% 1	1710
May	1st to 10th	Night	33% 5% 7% 28% 20% 8%	2860
	11th to 20th	Night	21% 5% 8% 26% 33% 8%	2835
	21st to end	Night	29% 6% 8% 27% 26% 5%	2984
June	1st to 10th	Night	29% 5% 14% 26% 22% 4	1330
	11th to 20th	Night	25% 4 8% 19% 29% 15%	1330
	21st to end	Night	16% 3 4 17% 31% 27%	1357
July	1st to 10th	Night	10% 2 3 8% 22% 55%	2500
	11th to 20th	Night	11% 3 2 10% 19% 54%	2492
	21st to end	Night	18% 3 3 12% 30% 35%	2842
August	1st to 10th	Night	21% 4 4 13% 25% 32%	2838
	11th to 20th	Night	16% 3 3 15% 33% 29%	2838
	21st to end	Night	15% 3 4 14% 28% 36%	3172
September	1st to 10th	Night	17% 3 4 12% 33% 32%	2000
	11th to 20th	Night	21% 4 6% 23% 27% 19%	2090
	21st to end	Night	21% 3 6% 24% 32% 14%	2090
October	1st to 10th	Night	16% 2 6% 17% 36% 22%	3551
	11th to 20th	Night	28% 3 7% 28% 24% 10%	3778
	21st to end	Night	27% 6% 12% 31% 22% 2	4418
November	1st to 10th	Night	33% 6% 14% 23% 21% 3	2528
	11th to 20th	Night	32% 7% 19% 27% 11% 3	2470
	21st to end	Night	32% 7% 17% 27% 14% 3	2614
December	1st to 10th	Night	40% 9% 19% 19% 10% 2	2664
	11th to 20th	Night	49% 6% 17% 21% 6%	3507
	21st to end	Night	43% 7% 17% 18% 13% 2	5072

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	9% 11% 24% 31% 20% 5%	180
	11th to 20th	Day	7% 7% 21% 35% 21% 9%	180
	21st to end	Day	8% 6% 20% 40% 21% 4	250
February	1st to 10th	Day	8% 9% 37% 32% 11% 2	270
	11th to 20th	Day	5% 9% 32% 36% 14% 3	368
	21st to end	Day	5% 12% 32% 34% 14% 2	382
March	1st to 10th	Day	6% 9% 33% 36% 15% 2	460
	11th to 20th	Day	7% 11% 21% 34% 23% 4	460
	21st to end	Day	9% 11% 26% 36% 15% 3	506
April	1st to 10th	Day	8% 12% 27% 31% 19% 3	460
	11th to 20th	Day	8% 16% 35% 26% 12% 4	452
	21st to end	Day	10% 12% 27% 28% 19% 4	460
May	1st to 10th	Day	7% 12% 27% 32% 19% 3	463
	11th to 20th	Day	13% 11% 23% 27% 20% 5%	488
	21st to end	Day	11% 9% 24% 26% 20% 10%	529
June	1st to 10th	Day	6% 11% 24% 28% 23% 8%	675
	11th to 20th	Day	8% 14% 27% 31% 16% 4	680
	21st to end	Day	2 7% 26% 36% 25% 5%	646
July	1st to 10th	Day	2 7% 30% 32% 24% 6%	486
	11th to 20th	Day	2 6% 29% 39% 19% 5%	484
	21st to end	Day	4 4 25% 34% 27% 5%	531
August	1st to 10th	Day	6% 5% 25% 34% 25% 5%	487
	11th to 20th	Day	3 6% 22% 31% 28% 9%	477
	21st to end	Day	3 8% 26% 29% 26% 8%	539
September	1st to 10th	Day	3 6% 23% 27% 31% 10%	490
	11th to 20th	Day	6% 8% 23% 29% 24% 9%	490
	21st to end	Day	7% 10% 20% 28% 27% 8%	490
October	1st to 10th	Day	9% 7% 19% 32% 27% 7%	452
	11th to 20th	Day	3 12% 20% 27% 25% 12%	300
	21st to end	Day	8% 11% 26% 36% 17% 2	330
November	1st to 10th	Day	7% 14% 25% 30% 21% 3	297
	11th to 20th	Day	3 9% 24% 36% 21% 6%	270
	21st to end	Day	8% 5% 29% 36% 20% 3	270
December	1st to 10th	Day	6% 10% 27% 33% 18% 5%	266
	11th to 20th	Day	7% 7% 23% 40% 21% 2	180
	21st to end	Day	10% 7% 22% 36% 21% 5%	198
January	1st to 10th	Night	8% 5% 24% 40% 20% 4	760
	11th to 20th	Night	6% 7% 22% 40% 19% 6%	760
	21st to end	Night	10% 3 20% 43% 20% 4	836
February	1st to 10th	Night	7% 5% 32% 39% 15% 2	760
	11th to 20th	Night	8% 5% 29% 40% 15% 2	744
	21st to end	Night	6% 7% 30% 37% 19% 1	628
March	1st to 10th	Night	5% 7% 27% 43% 15% 3	760
	11th to 20th	Night	6% 6% 25% 42% 18% 3	760
	21st to end	Night	8% 7% 28% 39% 16% 2	836
April	1st to 10th	Night	9% 6% 26% 39% 19% 1	760
	11th to 20th	Night	7% 5% 34% 38% 13% 2	587
	21st to end	Night	7% 5% 26% 42% 18% 3	570
May	1st to 10th	Night	6% 8% 28% 36% 19% 2	570
	11th to 20th	Night	8% 4 23% 37% 25% 3	561
	21st to end	Night	13% 6% 22% 33% 22% 3	543
June	1st to 10th	Night	5% 4 18% 44% 25% 4	380
	11th to 20th	Night	7% 5% 23% 48% 16% 2	380
	21st to end	Night	4 1 19% 48% 25% 3	380
July	1st to 10th	Night	2 1 14% 52% 29% 3	370
	11th to 20th	Night	1 1 10% 64% 25% 1	368
	21st to end	Night	2 1 13% 49% 32% 3	514
August	1st to 10th	Night	5% 4 13% 49% 28% 2	567
	11th to 20th	Night	2 2 15% 47% 31% 3	564
	21st to end	Night	4 2 16% 47% 27% 5%	640
September	1st to 10th	Night	4 16% 43% 31% 6%	760
	11th to 20th	Night	6% 3 14% 36% 33% 7%	760
	21st to end	Night	7% 3 18% 35% 28% 9%	760
October	1st to 10th	Night	9% 4 15% 41% 28% 3	760
	11th to 20th	Night	6% 4 19% 40% 25% 5%	760
	21st to end	Night	5% 5% 26% 41% 19% 4	836
November	1st to 10th	Night	8% 5% 24% 39% 22% 3	778
	11th to 20th	Night	4 5% 31% 41% 17% 2	760
	21st to end	Night	6% 5% 23% 43% 18% 4	904
December	1st to 10th	Night	6% 6% 25% 45% 15% 2	950
	11th to 20th	Night	9% 8% 23% 43% 15% 2	950
	21st to end	Night	11% 6% 29% 40% 12% 2	955

Page generated at 2024-11-07 04:55:47. Version ac07

Copyright © 2024 Attilla Danko.