Panacea
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Panacea clear sky chart from 2005-11-06 to 2024-11-04.

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	9% 5% 2 6% 4 4 5% 5% 7% 10% 43%	100895
	Night	9% 6% 2 6% 4 4 5% 4 7% 9% 44%	98058
Transparency	Day	18% 49% 11% 10% 8% 4	104777
	Night	19% 48% 9% 10% 9% 4	102315
Seeing	Day	10% 4 18% 27% 26% 14%	15026
	Night	11% 5% 18% 30% 28% 8%	24998

By Month

Percentage Cloud Cover SE (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	15% 5% 3 6% 5% 3 4 4 5% 6% 44%	2836
	11th to 20th	Day	12% 6% 3 6% 5% 4 5% 4 6% 7% 44%	2904
	21st to end	Day	16% 9% 3 5% 4 4 4 3 6% 6% 40%	3476
February	1st to 10th	Day	16% 7% 2 5% 5% 4 4 3 5% 6% 43%	1900
	11th to 20th	Day	15% 7% 2 4 3 3 4 3 4 6% 49%	1848
	21st to end	Day	12% 7% 3 5% 6% 4 4 3 4 6% 46%	1570
March	1st to 10th	Day	18% 8% 2 6% 4 3 4 3 6% 8% 39%	3248
	11th to 20th	Day	6% 5% 2 6% 4 4 5% 5% 7% 9% 47%	3480
	21st to end	Day	14% 5% 1 4 3 3 3 2 5% 7% 52%	3815
April	1st to 10th	Day	9% 4 2 6% 4 3 4 5% 6% 9% 47%	2090
	11th to 20th	Day	10% 5% 2 6% 4 4 4 3 5% 6% 51%	2234
	21st to end	Day	5% 4 1 4 3 3 4 3 5% 9% 58%	2322
May	1st to 10th	Day	5% 3 1 4 3 4 4 4 7% 9% 56%	4082
	11th to 20th	Day	8% 7% 3 7% 5% 4 5% 4 6% 8% 43%	4081
	21st to end	Day	3 3 1 4 3 3 5% 5% 7% 12% 55%	4476
June	1st to 10th	Day	8% 5% 2 7% 5% 6% 6% 6% 10% 12% 33%	2470
	11th to 20th	Day	5% 4 2 6% 5% 5% 7% 6% 11% 13% 36%	2470
	21st to end	Day	6% 5% 2 7% 6% 5% 7% 7% 11% 13% 31%	2470
July	1st to 10th	Day	5% 5% 2 7% 5% 6% 6% 7% 12% 15% 29%	4120
	11th to 20th	Day	4 3 2 5% 4 5% 6% 6% 9% 14% 42%	4120
	21st to end	Day	3 4 2 6% 6% 8% 9% 7% 12% 15% 27%	4466
August	1st to 10th	Day	7% 4 2 7% 5% 6% 7% 6% 9% 13% 34%	3817
	11th to 20th	Day	6% 4 1 5% 4 5% 6% 6% 9% 12% 41%	3729
	21st to end	Day	7% 6% 2 7% 6% 6% 7% 6% 9% 13% 33%	4117
September	1st to 10th	Day	9% 7% 3 7% 6% 5% 6% 5% 8% 12% 31%	2090
	11th to 20th	Day	9% 7% 2 7% 6% 6% 6% 5% 8% 10% 34%	2090
	21st to end	Day	10% 5% 2 5% 4 5% 4 4 6% 8% 47%	2090
October	1st to 10th	Day	9% 6% 2 5% 4 4 4 3 5% 8% 48%	2090
	11th to 20th	Day	5% 3 1 3 3 3 3 3 4 7% 65%	2057
	21st to end	Day	7% 4 2 5% 4 4 4 3 5% 5% 57%	2090
November	1st to 10th	Day	7% 4 2 4 3 4 3 4 5% 7% 59%	1840
	11th to 20th	Day	9% 5% 2 5% 3 3 3 3 5% 6% 55%	1710
	21st to end	Day	10% 5% 2 5% 3 4 4 4 5% 7% 50%	1710
December	1st to 10th	Day	12% 7% 3 5% 5% 4 4 4 5% 7% 45%	1710
	11th to 20th	Day	15% 7% 3 6% 4 4 4 3 5% 7% 43%	2153
	21st to end	Day	18% 9% 3 6% 4 4 3 2 4 5% 42%	3124
January	1st to 10th	Night	15% 9% 2 6% 4 4 4 3 5% 7% 42%	4109
	11th to 20th	Night	10% 7% 3 8% 5% 4 5% 3 6% 8% 41%	4052
	21st to end	Night	16% 10% 3 7% 4 4 3 3 5% 6% 39%	4180
February	1st to 10th	Night	15% 7% 2 5% 4 4 4 4 5% 8% 44%	2280
	11th to 20th	Night	14% 8% 2 6% 4 4 3 3 5% 5% 47%	2218
	21st to end	Night	13% 9% 3 7% 4 4 3 3 4 5% 46%	1884
March	1st to 10th	Night	14% 11% 4 8% 5% 5% 4 3 5% 7% 34%	3591
	11th to 20th	Night	8% 6% 2 6% 4 4 5% 4 8% 9% 45%	3480
	21st to end	Night	15% 5% 2 5% 4 4 3 3 5% 7% 48%	3817
April	1st to 10th	Night	9% 5% 2 5% 5% 4 4 4 6% 8% 48%	2090
	11th to 20th	Night	8% 5% 2 6% 4 4 4 4 6% 7% 49%	1908
	21st to end	Night	4 4 2 4 4 4 4 3 6% 8% 58%	1857
May	1st to 10th	Night	5% 2 1 3 3 3 4 4 7% 11% 56%	2813
	11th to 20th	Night	9% 5% 2 6% 4 4 4 4 6% 9% 46%	2812
	21st to end	Night	3 3 1 4 3 4 4 4 6% 11% 59%	3079
June	1st to 10th	Night	8% 6% 2 5% 3 5% 5% 5% 8% 13% 40%	1710
	11th to 20th	Night	4 5% 2 6% 6% 5% 4 4 10% 13% 42%	1710
	21st to end	Night	5% 5% 2 6% 4 5% 5% 6% 10% 11% 42%	1710
July	1st to 10th	Night	4 4 2 8% 6% 7% 9% 8% 11% 16% 27%	2840
	11th to 20th	Night	3 3 1 4 4 4 5% 6% 8% 14% 48%	2840
	21st to end	Night	3 3 2 5% 6% 6% 7% 6% 11% 16% 35%	3087
August	1st to 10th	Night	6% 4 1 5% 5% 5% 6% 6% 10% 14% 39%	3106
	11th to 20th	Night	4 3 1 5% 5% 5% 6% 6% 9% 14% 43%	3100
	21st to end	Night	7% 5% 3 8% 6% 7% 8% 7% 9% 13% 27%	3504
September	1st to 10th	Night	8% 7% 2 9% 7% 6% 6% 6% 9% 11% 29%	2090
	11th to 20th	Night	10% 6% 3 7% 6% 7% 7% 5% 7% 10% 32%	2090
	21st to end	Night	8% 5% 2 6% 4 4 5% 4 8% 9% 44%	2090
October	1st to 10th	Night	8% 7% 2 7% 4 5% 3 4 5% 8% 47%	2090
	11th to 20th	Night	5% 4 2 4 3 3 4 3 5% 7% 60%	2123
	21st to end	Night	7% 4 3 5% 4 3 4 4 6% 7% 53%	2508
November	1st to 10th	Night	6% 5% 1 6% 3 5% 5% 3 6% 7% 53%	2306
	11th to 20th	Night	10% 5% 2 5% 4 3 4 4 5% 6% 53%	2470
	21st to end	Night	11% 7% 2 5% 4 4 3 4 5% 6% 50%	2470
December	1st to 10th	Night	12% 6% 2 6% 5% 4 4 3 5% 9% 46%	2470
	11th to 20th	Night	13% 7% 3 5% 4 3 4 3 4 7% 48%	3042
	21st to end	Night	15% 9% 3 7% 4 4 4 3 5% 5% 41%	4532

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	26% 38% 4 10% 15% 7%	2837
	11th to 20th	Day	26% 39% 4 10% 9% 12%	2904
	21st to end	Day	27% 41% 4 10% 14% 5%	3476
February	1st to 10th	Day	14% 65% 5% 6% 5% 4	1900
	11th to 20th	Day	13% 64% 2 9% 9% 3	1858
	21st to end	Day	15% 65% 4 4 8% 5%	1570
March	1st to 10th	Day	32% 43% 8% 11% 4 2	3248
	11th to 20th	Day	20% 45% 10% 10% 12% 4	3480
	21st to end	Day	20% 41% 9% 17% 6% 7%	3815
April	1st to 10th	Day	12% 66% 5% 6% 5% 5%	2090
	11th to 20th	Day	13% 66% 3 8% 7% 3	2234
	21st to end	Day	9% 65% 5% 9% 8% 4	2322
May	1st to 10th	Day	14% 44% 13% 15% 10% 4	4120
	11th to 20th	Day	25% 42% 8% 16% 8% 1	4085
	21st to end	Day	9% 42% 15% 21% 12% 1	4489
June	1st to 10th	Day	15% 68% 9% 7% 2	2470
	11th to 20th	Day	14% 69% 8% 5% 3	2470
	21st to end	Day	13% 67% 12% 6% 3	2470
July	1st to 10th	Day	21% 45% 29% 4	4055
	11th to 20th	Day	14% 42% 37% 7%	4051
	21st to end	Day	25% 50% 20% 5%	4324
August	1st to 10th	Day	22% 41% 17% 12% 6% 1	3804
	11th to 20th	Day	13% 42% 18% 19% 8%	3765
	21st to end	Day	20% 42% 21% 13% 3	4117
September	1st to 10th	Day	17% 64% 9% 4 4 1	2090
	11th to 20th	Day	14% 63% 9% 8% 5% 1	2090
	21st to end	Day	13% 61% 7% 12% 5% 2	2090
October	1st to 10th	Day	31% 38% 5% 7% 11% 9%	3480
	11th to 20th	Day	4 36% 2 12% 23% 22%	3401
	21st to end	Day	6% 37% 3 15% 31% 8%	3428
November	1st to 10th	Day	13% 59% 6% 9% 8% 6%	1840
	11th to 20th	Day	15% 60% 4 6% 12% 4	1710
	21st to end	Day	14% 60% 3 9% 10% 4	1710
December	1st to 10th	Day	15% 61% 6% 8% 8% 2	1710
	11th to 20th	Day	21% 48% 3 7% 12% 9%	2150
	21st to end	Day	32% 37% 4 14% 10% 2	3124
January	1st to 10th	Night	29% 37% 3 7% 11% 13%	4109
	11th to 20th	Night	30% 38% 3 9% 14% 6%	4052
	21st to end	Night	29% 40% 4 10% 12% 5%	4180
February	1st to 10th	Night	13% 66% 3 7% 8% 3	2280
	11th to 20th	Night	15% 64% 3 7% 8% 4	2219
	21st to end	Night	15% 65% 4 5% 6% 5%	1884
March	1st to 10th	Night	37% 44% 6% 8% 4 2	3591
	11th to 20th	Night	21% 43% 8% 13% 11% 4	3480
	21st to end	Night	25% 41% 4 13% 10% 6%	3817
April	1st to 10th	Night	14% 66% 3 6% 6% 5%	2090
	11th to 20th	Night	12% 65% 2 8% 8% 5%	1908
	21st to end	Night	8% 65% 4 12% 7% 4	1857
May	1st to 10th	Night	10% 44% 17% 16% 9% 4	2840
	11th to 20th	Night	23% 43% 10% 15% 8% 1	2813
	21st to end	Night	9% 42% 11% 27% 11% 1	3087
June	1st to 10th	Night	13% 66% 9% 9% 2	1710
	11th to 20th	Night	12% 68% 10% 7% 3	1710
	21st to end	Night	10% 67% 11% 9% 3	1710
July	1st to 10th	Night	27% 44% 22% 6%	2795
	11th to 20th	Night	12% 42% 35% 10% 1	2786
	21st to end	Night	23% 45% 25% 6% 1	2988
August	1st to 10th	Night	20% 41% 19% 13% 7%	3095
	11th to 20th	Night	13% 42% 19% 21% 5%	3130
	21st to end	Night	25% 44% 18% 10% 3	3504
September	1st to 10th	Night	19% 63% 7% 5% 4 1	2090
	11th to 20th	Night	14% 63% 10% 8% 4 1	2090
	21st to end	Night	12% 61% 8% 10% 7% 1	2090
October	1st to 10th	Night	32% 38% 5% 8% 10% 6%	3480
	11th to 20th	Night	6% 37% 2 13% 22% 20%	3518
	21st to end	Night	7% 37% 3 14% 30% 9%	4120
November	1st to 10th	Night	17% 58% 5% 9% 7% 4	2306
	11th to 20th	Night	16% 60% 3 8% 9% 5%	2470
	21st to end	Night	14% 60% 4 8% 9% 4	2470
December	1st to 10th	Night	18% 60% 6% 8% 7% 2	2470
	11th to 20th	Night	19% 49% 2 7% 13% 9%	3044
	21st to end	Night	33% 37% 5% 13% 10% 1	4532

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% 8% 43% 28% 7% 1	270
	11th to 20th	Day	7% 10% 34% 35% 10% 3	270
	21st to end	Day	24% 8% 40% 24% 4	297
February	1st to 10th	Day	19% 10% 33% 24% 13% 1	270
	11th to 20th	Day	22% 6% 31% 31% 9%	270
	21st to end	Day	12% 7% 43% 29% 8% 1	225
March	1st to 10th	Day	11% 8% 38% 31% 11% 1	346
	11th to 20th	Day	12% 9% 33% 32% 13% 2	460
	21st to end	Day	13% 8% 32% 30% 14% 2	506
April	1st to 10th	Day	11% 9% 33% 32% 14% 2	460
	11th to 20th	Day	11% 6% 31% 31% 18% 3	452
	21st to end	Day	6% 4 26% 36% 23% 4	460
May	1st to 10th	Day	5% 5% 22% 39% 22% 7%	463
	11th to 20th	Day	8% 5% 15% 31% 28% 13%	487
	21st to end	Day	8% 2 8% 32% 33% 17%	529
June	1st to 10th	Day	10% 2 8% 30% 34% 17%	490
	11th to 20th	Day	7% 2 8% 24% 35% 24%	490
	21st to end	Day	7% 1 4 24% 38% 26%	490
July	1st to 10th	Day	7% 3 4 14% 35% 38%	485
	11th to 20th	Day	5% 2 2 16% 36% 38%	484
	21st to end	Day	5% 2 3 17% 39% 34%	532
August	1st to 10th	Day	10% 2 3 16% 40% 29%	486
	11th to 20th	Day	8% 1 4 13% 37% 37%	479
	21st to end	Day	8% 2 7% 20% 38% 25%	539
September	1st to 10th	Day	10% 4 6% 18% 35% 27%	490
	11th to 20th	Day	12% 3 8% 23% 36% 18%	490
	21st to end	Day	12% 1 6% 23% 39% 19%	490
October	1st to 10th	Day	12% 3 16% 33% 28% 7%	490
	11th to 20th	Day	5% 2 14% 31% 37% 10%	490
	21st to end	Day	7% 4 17% 36% 32% 4	539
November	1st to 10th	Day	9% 5% 19% 35% 26% 7%	420
	11th to 20th	Day	12% 5% 26% 40% 14% 4	270
	21st to end	Day	11% 5% 28% 36% 18% 2	270
December	1st to 10th	Day	16% 8% 30% 27% 13% 5%	270
	11th to 20th	Day	17% 7% 31% 33% 11% 1	270
	21st to end	Day	20% 5% 25% 31% 16% 3	297
January	1st to 10th	Night	17% 10% 34% 29% 10% 1	760
	11th to 20th	Night	13% 8% 29% 33% 15% 2	760
	21st to end	Night	19% 8% 33% 31% 9%	836
February	1st to 10th	Night	17% 8% 26% 36% 13% 1	760
	11th to 20th	Night	18% 9% 26% 34% 12% 1	743
	21st to end	Night	16% 8% 29% 37% 10%	628
March	1st to 10th	Night	14% 6% 28% 36% 16% 1	760
	11th to 20th	Night	13% 4 26% 35% 21% 1	760
	21st to end	Night	12% 7% 25% 37% 19% 1	836
April	1st to 10th	Night	11% 5% 26% 36% 21% 1	760
	11th to 20th	Night	10% 6% 25% 34% 23% 2	596
	21st to end	Night	6% 4 21% 38% 28% 3	570
May	1st to 10th	Night	6% 2 18% 37% 31% 6%	570
	11th to 20th	Night	7% 1 15% 36% 34% 6%	561
	21st to end	Night	5% 1 5% 34% 45% 10%	617
June	1st to 10th	Night	9% 1 5% 28% 47% 9%	570
	11th to 20th	Night	5% 2 5% 27% 41% 20%	570
	21st to end	Night	6% 2 5% 20% 46% 21%	570
July	1st to 10th	Night	6% 2 4 13% 45% 30%	555
	11th to 20th	Night	6% 1 1 9% 45% 37%	552
	21st to end	Night	3 1 1 11% 52% 31%	624
August	1st to 10th	Night	8% 1 2 13% 49% 28%	567
	11th to 20th	Night	5% 1 3 13% 48% 30%	564
	21st to end	Night	9% 3 5% 20% 40% 23%	642
September	1st to 10th	Night	9% 2 6% 22% 42% 18%	760
	11th to 20th	Night	11% 2 8% 28% 39% 12%	760
	21st to end	Night	10% 2 11% 28% 39% 10%	760
October	1st to 10th	Night	10% 2 18% 33% 31% 5%	760
	11th to 20th	Night	6% 3 18% 37% 30% 6%	760
	21st to end	Night	8% 4 17% 40% 27% 3	836
November	1st to 10th	Night	9% 4 23% 38% 24% 2	755
	11th to 20th	Night	12% 8% 25% 36% 19% 1	760
	21st to end	Night	13% 6% 25% 38% 18% 2	760
December	1st to 10th	Night	16% 7% 24% 31% 19% 3	760
	11th to 20th	Night	15% 7% 26% 33% 18% 1	760
	21st to end	Night	18% 6% 26% 31% 17% 1	836

Page generated at 2024-11-01 22:47:46. Version ac07

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