Panorama Point
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Panorama Point clear sky chart from 2005-11-06 to 2026-07-01.

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 4 2 5% 4 4 4 4 6% 8% 58%	146322
	Night	4 5% 2 5% 4 4 5% 4 6% 8% 54%	143603
Transparency	Day	22% 6% 10% 19% 25% 17%	141154
	Night	25% 6% 10% 21% 24% 15%	139778
Seeing	Day	6% 7% 19% 32% 27% 9%	17353
	Night	6% 4 16% 43% 28% 3	27620

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	3 7% 3 8% 5% 6% 6% 5% 8% 9% 38%	5318
	11th to 20th	Day	2 3 2 6% 4 5% 7% 5% 7% 9% 51%	5340
	21st to end	Day	4 6% 2 6% 4 4 6% 4 6% 8% 49%	5844
February	1st to 10th	Day	3 6% 3 8% 5% 6% 6% 5% 8% 9% 40%	1890
	11th to 20th	Day	4 8% 3 8% 6% 4 5% 5% 7% 9% 40%	1845
	21st to end	Day	6% 7% 2 6% 4 5% 5% 4 5% 10% 46%	1775
March	1st to 10th	Day	3 6% 2 7% 4 4 4 4 5% 7% 53%	5064
	11th to 20th	Day	4 8% 4 8% 5% 4 5% 4 6% 8% 44%	5110
	21st to end	Day	5% 8% 3 8% 6% 5% 5% 4 6% 7% 44%	5607
April	1st to 10th	Day	4 5% 2 5% 5% 3 4 3 5% 8% 57%	2431
	11th to 20th	Day	3 4 2 5% 5% 4 5% 4 5% 8% 56%	2491
	21st to end	Day	2 4 2 4 4 3 4 4 5% 8% 59%	2649
May	1st to 10th	Day	3 3 1 4 4 4 4 3 6% 8% 59%	7626
	11th to 20th	Day	3 3 1 4 3 4 4 4 6% 7% 63%	7596
	21st to end	Day	2 2 1 3 3 3 4 3 5% 7% 68%	8545
June	1st to 10th	Day	2 2 1 3 2 2 3 3 6% 7% 68%	2940
	11th to 20th	Day	1 2 1 3 2 2 3 3 3 5% 74%	2940
	21st to end	Day	1 2 1 2 2 2 3 3 4 6% 75%	2918
July	1st to 10th	Day	2 1 1 2 2 2 3 2 4 5% 75%	5880
	11th to 20th	Day	2 3 1 3 2 3 4 4 8% 10% 61%	5880
	21st to end	Day	1 2 1 3 3 3 4 3 6% 8% 66%	6401
August	1st to 10th	Day	1 2 1 3 3 3 4 4 6% 10% 63%	5779
	11th to 20th	Day	2 2 1 3 3 3 4 3 6% 7% 67%	5798
	21st to end	Day	5% 3 1 4 4 4 4 4 7% 9% 56%	6077
September	1st to 10th	Day	4 2 1 3 3 3 3 3 5% 6% 67%	2400
	11th to 20th	Day	2 2 1 4 2 3 3 3 5% 7% 68%	2226
	21st to end	Day	3 3 1 3 2 2 3 2 3 7% 72%	2200
October	1st to 10th	Day	3 2 1 2 1 2 2 1 3 4 79%	3270
	11th to 20th	Day	5% 4 2 5% 3 3 4 3 5% 8% 58%	3250
	21st to end	Day	3 3 1 3 3 4 3 3 5% 7% 65%	3548
November	1st to 10th	Day	3 4 2 3 3 2 3 2 5% 7% 67%	2059
	11th to 20th	Day	3 4 2 3 3 2 3 2 5% 7% 66%	1831
	21st to end	Day	5% 5% 1 5% 3 4 5% 2 5% 6% 59%	1680
December	1st to 10th	Day	3 5% 2 4 4 6% 7% 7% 8% 9% 46%	2700
	11th to 20th	Day	3 5% 2 6% 5% 7% 8% 7% 10% 11% 36%	3106
	21st to end	Day	4 10% 3 8% 6% 6% 7% 5% 7% 10% 34%	4308
January	1st to 10th	Night	5% 8% 4 9% 6% 6% 5% 4 6% 8% 40%	7605
	11th to 20th	Night	2 4 2 5% 3 4 6% 5% 7% 9% 54%	7650
	21st to end	Night	5% 8% 3 7% 4 4 4 4 5% 6% 50%	8370
February	1st to 10th	Night	2 5% 2 7% 4 5% 5% 5% 7% 11% 47%	2730
	11th to 20th	Night	5% 7% 3 7% 5% 5% 5% 4 7% 7% 43%	2662
	21st to end	Night	4 7% 2 7% 4 4 5% 5% 6% 11% 45%	2026
March	1st to 10th	Night	4 7% 2 6% 5% 4 5% 4 6% 6% 51%	5050
	11th to 20th	Night	5% 7% 3 7% 4 5% 5% 4 6% 8% 47%	5110
	21st to end	Night	5% 9% 2 6% 5% 5% 4 4 6% 7% 47%	5610
April	1st to 10th	Night	5% 6% 2 6% 4 5% 4 4 5% 6% 53%	2189
	11th to 20th	Night	5% 6% 2 5% 4 5% 5% 4 5% 6% 53%	2077
	21st to end	Night	5% 6% 2 5% 3 4 4 4 6% 8% 54%	1968
May	1st to 10th	Night	5% 5% 2 5% 4 4 4 4 5% 7% 56%	5321
	11th to 20th	Night	4 5% 2 5% 4 4 4 4 6% 6% 57%	5296
	21st to end	Night	4 3 1 4 3 3 3 3 5% 8% 63%	5657
June	1st to 10th	Night	3 4 1 5% 3 4 4 3 6% 6% 61%	1680
	11th to 20th	Night	2 3 2 5% 3 3 3 3 5% 7% 64%	1680
	21st to end	Night	1 2 1 4 3 3 3 3 5% 6% 68%	1694
July	1st to 10th	Night	2 2 1 3 3 4 5% 4 6% 7% 64%	4100
	11th to 20th	Night	2 3 1 6% 5% 6% 6% 5% 9% 11% 47%	4100
	21st to end	Night	1 2 1 4 4 4 4 4 7% 9% 59%	4472
August	1st to 10th	Night	2 2 1 4 4 5% 6% 5% 8% 10% 53%	4033
	11th to 20th	Night	2 2 1 4 3 4 4 4 5% 7% 62%	4051
	21st to end	Night	4 4 2 5% 4 5% 5% 4 7% 8% 52%	4899
September	1st to 10th	Night	4 3 1 3 2 3 4 3 5% 7% 65%	2000
	11th to 20th	Night	3 3 1 4 3 3 4 3 4 7% 67%	2170
	21st to end	Night	4 2 1 3 3 3 3 3 4 5% 71%	2200
October	1st to 10th	Night	4 2 1 2 2 2 3 2 4 5% 74%	3920
	11th to 20th	Night	4 4 2 5% 3 3 4 4 5% 8% 57%	3898
	21st to end	Night	4 4 1 4 3 3 3 3 4 6% 64%	4252
November	1st to 10th	Night	2 3 1 3 3 3 3 3 4 6% 68%	2460
	11th to 20th	Night	3 3 1 4 3 3 3 3 5% 5% 66%	2762
	21st to end	Night	5% 5% 2 4 4 4 4 4 5% 7% 57%	2940
December	1st to 10th	Night	3 4 1 4 3 4 7% 8% 9% 8% 50%	4710
	11th to 20th	Night	4 5% 2 5% 4 5% 6% 6% 11% 12% 41%	5321
	21st to end	Night	5% 7% 3 7% 6% 5% 5% 5% 8% 9% 41%	6940

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	33% 10% 21% 25% 10% 2	5321
	11th to 20th	Day	23% 10% 17% 28% 18% 4	5340
	21st to end	Day	28% 6% 13% 30% 19% 3	5844
February	1st to 10th	Day	32% 8% 18% 21% 16% 5%	1890
	11th to 20th	Day	34% 8% 14% 22% 18% 4	1854
	21st to end	Day	30% 6% 11% 26% 21% 6%	1775
March	1st to 10th	Day	27% 6% 8% 22% 30% 8%	5064
	11th to 20th	Day	35% 7% 11% 22% 19% 5%	5110
	21st to end	Day	36% 6% 10% 23% 22% 4	5607
April	1st to 10th	Day	26% 4 8% 24% 26% 12%	2431
	11th to 20th	Day	26% 4 10% 22% 26% 11%	2494
	21st to end	Day	22% 5% 10% 21% 33% 9%	2649
May	1st to 10th	Day	20% 5% 10% 17% 37% 10%	7626
	11th to 20th	Day	18% 5% 7% 16% 33% 21%	7599
	21st to end	Day	15% 3 7% 14% 43% 18%	8546
June	1st to 10th	Day	15% 2 8% 13% 34% 28%	2940
	11th to 20th	Day	13% 3 5% 6% 24% 48%	2940
	21st to end	Day	13% 2 6% 7% 22% 50%	2918
July	1st to 10th	Day	12% 3 5% 6% 12% 62%	5817
	11th to 20th	Day	15% 5% 6% 13% 27% 33%	5811
	21st to end	Day	14% 6% 7% 14% 25% 35%	6217
August	1st to 10th	Day	19% 8% 10% 23% 20% 19%	4208
	11th to 20th	Day	20% 5% 12% 15% 24% 24%	4197
	21st to end	Day	19% 6% 9% 18% 25% 23%	4380
September	1st to 10th	Day	18% 4 8% 12% 25% 32%	2400
	11th to 20th	Day	17% 5% 8% 17% 24% 29%	2226
	21st to end	Day	16% 3 6% 12% 39% 23%	2200
October	1st to 10th	Day	12% 3 5% 14% 28% 37%	3270
	11th to 20th	Day	24% 5% 6% 21% 35% 9%	3250
	21st to end	Day	16% 5% 9% 31% 34% 5%	3548
November	1st to 10th	Day	18% 3 9% 30% 32% 7%	2059
	11th to 20th	Day	19% 5% 9% 35% 30% 3	1831
	21st to end	Day	25% 7% 15% 28% 23% 3	1680
December	1st to 10th	Day	24% 16% 16% 29% 14% 2	2700
	11th to 20th	Day	28% 13% 25% 24% 9%	3104
	21st to end	Day	36% 10% 16% 15% 19% 4	4308
January	1st to 10th	Night	37% 6% 18% 24% 13% 2	7605
	11th to 20th	Night	21% 9% 14% 30% 23% 3	7650
	21st to end	Night	30% 6% 11% 26% 23% 4	8370
February	1st to 10th	Night	27% 8% 17% 26% 17% 4	2730
	11th to 20th	Night	33% 8% 13% 22% 20% 4	2663
	21st to end	Night	30% 5% 14% 23% 21% 7%	2026
March	1st to 10th	Night	30% 5% 7% 19% 27% 11%	5050
	11th to 20th	Night	30% 6% 10% 23% 23% 7%	5110
	21st to end	Night	31% 6% 9% 27% 24% 2	5610
April	1st to 10th	Night	31% 4 8% 18% 26% 13%	2189
	11th to 20th	Night	29% 5% 8% 19% 27% 13%	2077
	21st to end	Night	27% 5% 10% 17% 30% 11%	1968
May	1st to 10th	Night	26% 5% 8% 13% 34% 14%	5319
	11th to 20th	Night	24% 4 8% 14% 32% 18%	5297
	21st to end	Night	17% 4 7% 15% 37% 20%	5658
June	1st to 10th	Night	20% 3 9% 10% 31% 28%	1680
	11th to 20th	Night	19% 4 7% 7% 18% 44%	1680
	21st to end	Night	15% 3 7% 7% 21% 48%	1694
July	1st to 10th	Night	17% 5% 7% 7% 9% 55%	4055
	11th to 20th	Night	23% 7% 7% 12% 22% 29%	4046
	21st to end	Night	18% 6% 7% 11% 23% 35%	4344
August	1st to 10th	Night	28% 8% 11% 20% 14% 20%	2928
	11th to 20th	Night	25% 5% 10% 14% 16% 29%	2928
	21st to end	Night	21% 7% 9% 16% 22% 27%	3527
September	1st to 10th	Night	18% 4 8% 14% 20% 36%	2000
	11th to 20th	Night	18% 4 9% 17% 22% 31%	2170
	21st to end	Night	17% 3 7% 10% 33% 30%	2200
October	1st to 10th	Night	13% 3 5% 12% 24% 42%	3920
	11th to 20th	Night	23% 5% 7% 15% 37% 13%	3898
	21st to end	Night	20% 3 6% 31% 33% 7%	4252
November	1st to 10th	Night	19% 3 8% 24% 35% 12%	2460
	11th to 20th	Night	20% 4 8% 29% 33% 5%	2762
	21st to end	Night	25% 5% 11% 24% 28% 7%	2940
December	1st to 10th	Night	19% 10% 17% 35% 17% 2	4710
	11th to 20th	Night	26% 10% 19% 34% 11%	5322
	21st to end	Night	32% 9% 16% 21% 17% 5%	6940

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% 4 18% 38% 19% 8%	330
	11th to 20th	Day	8% 4 14% 41% 27% 6%	330
	21st to end	Day	4 3 11% 47% 28% 7%	363
February	1st to 10th	Day	8% 4 22% 41% 18% 6%	330
	11th to 20th	Day	11% 6% 21% 42% 18% 2	330
	21st to end	Day	8% 10% 19% 38% 20% 4	401
March	1st to 10th	Day	10% 9% 22% 33% 20% 6%	540
	11th to 20th	Day	8% 10% 24% 32% 20% 6%	540
	21st to end	Day	10% 12% 26% 33% 15% 3	594
April	1st to 10th	Day	9% 14% 22% 28% 19% 8%	540
	11th to 20th	Day	11% 16% 26% 30% 14% 3	532
	21st to end	Day	7% 16% 26% 26% 20% 5%	540
May	1st to 10th	Day	7% 12% 28% 30% 18% 5%	543
	11th to 20th	Day	6% 9% 26% 30% 22% 8%	568
	21st to end	Day	5% 11% 22% 27% 26% 9%	675
June	1st to 10th	Day	3 7% 17% 29% 34% 9%	780
	11th to 20th	Day	4 7% 22% 33% 27% 6%	780
	21st to end	Day	3 6% 22% 32% 31% 6%	758
July	1st to 10th	Day	2 2 17% 33% 33% 12%	527
	11th to 20th	Day	3 1 12% 30% 37% 17%	524
	21st to end	Day	3 2 10% 29% 41% 15%	575
August	1st to 10th	Day	4 2 15% 33% 34% 12%	527
	11th to 20th	Day	4 3 12% 29% 34% 19%	517
	21st to end	Day	3 2 16% 28% 36% 15%	583
September	1st to 10th	Day	3 2 14% 25% 32% 22%	530
	11th to 20th	Day	3 7% 20% 29% 31% 10%	530
	21st to end	Day	6% 8% 17% 22% 32% 14%	530
October	1st to 10th	Day	9% 7% 14% 22% 28% 21%	330
	11th to 20th	Day	5% 9% 19% 26% 28% 13%	330
	21st to end	Day	9% 5% 18% 30% 31% 8%	363
November	1st to 10th	Day	5% 8% 21% 30% 22% 14%	330
	11th to 20th	Day	2 5% 18% 37% 26% 12%	330
	21st to end	Day	8% 4 16% 36% 27% 8%	330
December	1st to 10th	Day	8% 6% 11% 42% 22% 11%	330
	11th to 20th	Day	6% 2 16% 35% 32% 8%	330
	21st to end	Day	13% 7% 16% 42% 18% 5%	363
January	1st to 10th	Night	7% 3 13% 46% 26% 4	840
	11th to 20th	Night	6% 2 14% 45% 28% 4	840
	21st to end	Night	9% 3 14% 49% 22% 4	924
February	1st to 10th	Night	6% 3 20% 49% 18% 4	840
	11th to 20th	Night	10% 4 19% 47% 18% 2	824
	21st to end	Night	8% 5% 23% 49% 15% 1	692
March	1st to 10th	Night	8% 6% 20% 46% 19% 1	840
	11th to 20th	Night	6% 5% 19% 45% 24% 1	840
	21st to end	Night	7% 7% 25% 44% 16% 1	924
April	1st to 10th	Night	9% 7% 23% 44% 17% 1	719
	11th to 20th	Night	9% 11% 24% 39% 17%	623
	21st to end	Night	8% 9% 25% 34% 20% 3	630
May	1st to 10th	Night	7% 7% 23% 43% 18% 2	630
	11th to 20th	Night	5% 4 19% 43% 24% 3	621
	21st to end	Night	6% 7% 23% 35% 27% 2	683
June	1st to 10th	Night	3 5% 19% 38% 34% 2	630
	11th to 20th	Night	4 4 22% 42% 26% 2	630
	21st to end	Night	2 3 17% 44% 33% 2	630
July	1st to 10th	Night	3 1 11% 36% 44% 4	585
	11th to 20th	Night	3 1 8% 34% 51% 5%	582
	21st to end	Night	3 6% 34% 51% 5%	657
August	1st to 10th	Night	4 2 7% 38% 46% 4	597
	11th to 20th	Night	5% 2 7% 40% 41% 5%	594
	21st to end	Night	4 2 8% 36% 42% 7%	660
September	1st to 10th	Night	5% 2 9% 38% 42% 5%	600
	11th to 20th	Night	2 3 12% 40% 37% 5%	770
	21st to end	Night	5% 3 14% 34% 36% 8%	800
October	1st to 10th	Night	6% 4 14% 40% 31% 4	800
	11th to 20th	Night	4 4 16% 43% 30% 4	800
	21st to end	Night	7% 3 16% 38% 32% 4	880
November	1st to 10th	Night	4 3 14% 46% 30% 3	820
	11th to 20th	Night	5% 2 14% 52% 22% 4	894
	21st to end	Night	7% 5% 15% 42% 26% 4	1050
December	1st to 10th	Night	8% 2 15% 50% 22% 3	1050
	11th to 20th	Night	9% 3 16% 44% 25% 3	1050
	21st to end	Night	11% 5% 17% 46% 18% 2	1071

Page generated at 2026-06-28 00:10:48. Version ac07

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