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 2024-04-03.

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 5% 5% 3 5% 5% 7% 9% 44%	79332
	Night	9% 6% 2 5% 5% 3 5% 5% 6% 9% 45%	80802
Transparency	Day	24% 38% 9% 13% 11% 5%	79055
	Night	24% 36% 9% 12% 12% 6%	80598
Seeing	Day	10% 4 18% 28% 26% 13%	14166
	Night	11% 5% 18% 30% 28% 8%	24277

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 5% 5% 2 4 4 5% 7% 44%	2836
	11th to 20th	Day	12% 5% 3 5% 5% 3 5% 5% 6% 7% 44%	2904
	21st to end	Day	17% 8% 3 5% 4 3 4 4 5% 6% 41%	3476
February	1st to 10th	Day	16% 6% 2 5% 5% 3 4 4 5% 7% 43%	1900
	11th to 20th	Day	15% 7% 2 4 3 2 4 4 4 6% 50%	1848
	21st to end	Day	13% 7% 3 4 6% 3 4 4 4 7% 46%	1570
March	1st to 10th	Day	8% 5% 2 3 4 2 3 4 6% 9% 53%	1976
	11th to 20th	Day	8% 4 2 5% 4 3 4 4 6% 8% 51%	2090
	21st to end	Day	9% 5% 2 4 4 2 4 4 4 7% 55%	2299
April	1st to 10th	Day	9% 4 3 5% 5% 2 5% 5% 6% 9% 48%	2002
	11th to 20th	Day	11% 5% 2 5% 5% 3 4 4 5% 7% 51%	2115
	21st to end	Day	5% 4 1 3 4 2 5% 4 5% 9% 58%	2199
May	1st to 10th	Day	6% 2 1 3 3 2 4 4 6% 8% 61%	2340
	11th to 20th	Day	5% 4 2 5% 5% 3 6% 6% 7% 11% 46%	2301
	21st to end	Day	5% 4 2 5% 5% 2 5% 6% 7% 11% 47%	2531
June	1st to 10th	Day	8% 5% 2 5% 7% 5% 6% 7% 9% 13% 32%	2340
	11th to 20th	Day	5% 3 2 5% 5% 4 7% 8% 11% 13% 37%	2340
	21st to end	Day	7% 4 2 6% 8% 4 7% 8% 10% 13% 31%	2340
July	1st to 10th	Day	8% 6% 3 6% 6% 4 6% 8% 10% 13% 31%	2340
	11th to 20th	Day	7% 5% 3 6% 7% 5% 7% 10% 9% 14% 28%	2340
	21st to end	Day	5% 4 3 5% 7% 5% 8% 7% 10% 14% 30%	2547
August	1st to 10th	Day	8% 4 2 6% 8% 4 7% 8% 9% 13% 31%	2166
	11th to 20th	Day	10% 5% 2 6% 8% 5% 6% 9% 10% 13% 26%	2125
	21st to end	Day	8% 7% 3 7% 7% 4 7% 8% 9% 12% 29%	2341
September	1st to 10th	Day	8% 5% 3 7% 7% 4 6% 8% 8% 13% 31%	1980
	11th to 20th	Day	7% 6% 2 6% 7% 4 7% 7% 8% 11% 35%	1980
	21st to end	Day	10% 5% 2 4 5% 4 5% 4 6% 8% 46%	1980
October	1st to 10th	Day	8% 5% 2 4 5% 3 4 5% 5% 8% 50%	1980
	11th to 20th	Day	6% 3 2 3 3 2 4 4 4 7% 63%	1949
	21st to end	Day	7% 4 2 5% 5% 3 5% 4 5% 5% 56%	1980
November	1st to 10th	Day	7% 4 2 4 3 2 4 4 5% 7% 59%	1810
	11th to 20th	Day	9% 5% 2 5% 3 2 3 4 5% 6% 56%	1710
	21st to end	Day	10% 4 3 4 5% 3 4 4 5% 7% 50%	1710
December	1st to 10th	Day	12% 6% 3 5% 5% 3 4 4 5% 8% 45%	1710
	11th to 20th	Day	15% 6% 3 5% 5% 3 4 4 5% 7% 43%	2153
	21st to end	Day	18% 9% 3 5% 4 3 3 3 4 5% 42%	3124
January	1st to 10th	Night	15% 9% 3 5% 5% 3 4 4 5% 7% 42%	4109
	11th to 20th	Night	10% 7% 3 7% 6% 3 5% 4 6% 8% 41%	4052
	21st to end	Night	16% 10% 3 6% 4 3 3 4 5% 6% 39%	4180
February	1st to 10th	Night	15% 6% 3 4 4 3 4 4 5% 8% 44%	2280
	11th to 20th	Night	14% 7% 3 5% 5% 2 4 3 5% 5% 47%	2218
	21st to end	Night	14% 8% 3 6% 4 3 4 3 4 5% 46%	1884
March	1st to 10th	Night	10% 6% 2 4 4 3 4 4 5% 9% 48%	2203
	11th to 20th	Night	9% 7% 2 4 4 2 4 5% 6% 9% 49%	2090
	21st to end	Night	9% 5% 1 4 4 2 4 4 4 7% 54%	2299
April	1st to 10th	Night	9% 4 2 4 5% 3 4 5% 6% 8% 49%	2003
	11th to 20th	Night	8% 5% 3 5% 5% 3 5% 5% 6% 7% 49%	1807
	21st to end	Night	4 4 2 3 4 3 4 4 6% 9% 58%	1760
May	1st to 10th	Night	5% 3 1 2 3 2 4 4 5% 10% 60%	1620
	11th to 20th	Night	4 4 2 4 4 2 5% 5% 7% 11% 51%	1592
	21st to end	Night	5% 3 2 4 5% 3 4 6% 7% 10% 52%	1744
June	1st to 10th	Night	8% 5% 3 5% 4 3 6% 5% 7% 12% 41%	1620
	11th to 20th	Night	4 4 2 5% 6% 3 5% 5% 9% 13% 43%	1620
	21st to end	Night	6% 4 2 5% 5% 3 6% 6% 9% 12% 42%	1620
July	1st to 10th	Night	6% 4 2 5% 6% 4 7% 8% 8% 14% 37%	1620
	11th to 20th	Night	5% 4 2 5% 5% 4 7% 9% 10% 15% 34%	1620
	21st to end	Night	4 3 2 4 5% 3 7% 6% 9% 14% 44%	1771
August	1st to 10th	Night	5% 5% 2 4 5% 3 6% 7% 10% 15% 38%	1766
	11th to 20th	Night	6% 4 2 5% 7% 5% 6% 8% 9% 15% 33%	1776
	21st to end	Night	8% 5% 4 7% 6% 5% 7% 8% 7% 12% 31%	1994
September	1st to 10th	Night	6% 6% 3 7% 8% 5% 6% 7% 9% 12% 30%	1980
	11th to 20th	Night	9% 5% 3 6% 7% 5% 6% 7% 8% 10% 33%	1980
	21st to end	Night	8% 5% 2 5% 6% 3 5% 6% 8% 10% 43%	1980
October	1st to 10th	Night	7% 6% 2 6% 6% 4 3 4 5% 9% 48%	1980
	11th to 20th	Night	5% 3 2 4 3 3 4 4 5% 8% 59%	2011
	21st to end	Night	7% 4 3 5% 5% 2 4 5% 6% 6% 52%	2376
November	1st to 10th	Night	6% 5% 2 5% 4 4 5% 5% 6% 7% 53%	2263
	11th to 20th	Night	10% 5% 2 5% 4 2 4 4 5% 6% 53%	2470
	21st to end	Night	11% 6% 3 5% 4 3 3 5% 5% 7% 50%	2470
December	1st to 10th	Night	12% 5% 2 5% 5% 3 4 4 5% 9% 47%	2470
	11th to 20th	Night	13% 6% 3 5% 4 2 4 4 4 7% 48%	3042
	21st to end	Night	15% 9% 3 6% 5% 3 4 4 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	29% 26% 6% 12% 18% 9%	2837
	11th to 20th	Day	29% 28% 6% 12% 12% 13%	2904
	21st to end	Day	36% 25% 7% 10% 16% 7%	3476
February	1st to 10th	Day	29% 35% 6% 10% 13% 7%	1900
	11th to 20th	Day	27% 36% 5% 8% 15% 10%	1858
	21st to end	Day	24% 36% 7% 12% 14% 6%	1570
March	1st to 10th	Day	19% 36% 5% 15% 19% 6%	1976
	11th to 20th	Day	19% 36% 11% 14% 12% 7%	2090
	21st to end	Day	20% 36% 10% 16% 12% 5%	2299
April	1st to 10th	Day	21% 38% 9% 13% 12% 7%	2002
	11th to 20th	Day	21% 37% 6% 15% 15% 7%	2115
	21st to end	Day	14% 37% 8% 19% 15% 6%	2199
May	1st to 10th	Day	14% 38% 10% 20% 15% 3	2340
	11th to 20th	Day	19% 41% 14% 14% 12% 2	2305
	21st to end	Day	18% 40% 10% 19% 11% 2	2531
June	1st to 10th	Day	23% 42% 12% 18% 3 1	2340
	11th to 20th	Day	19% 42% 17% 17% 4	2340
	21st to end	Day	26% 43% 13% 11% 5% 1	2340
July	1st to 10th	Day	32% 44% 13% 10% 2	2275
	11th to 20th	Day	27% 45% 15% 9% 3	2271
	21st to end	Day	26% 44% 19% 10% 1	2405
August	1st to 10th	Day	24% 44% 16% 13% 2	2153
	11th to 20th	Day	29% 43% 14% 11% 2	2125
	21st to end	Day	33% 43% 12% 8% 3 1	2341
September	1st to 10th	Day	27% 44% 14% 11% 4 1	1980
	11th to 20th	Day	30% 43% 12% 9% 5% 1	1980
	21st to end	Day	25% 38% 9% 11% 11% 5%	1980
October	1st to 10th	Day	22% 38% 8% 11% 12% 9%	1980
	11th to 20th	Day	17% 37% 7% 14% 17% 8%	1949
	21st to end	Day	20% 38% 5% 9% 18% 11%	1980
November	1st to 10th	Day	13% 40% 6% 12% 16% 12%	1810
	11th to 20th	Day	17% 40% 5% 12% 18% 8%	1710
	21st to end	Day	20% 41% 6% 14% 14% 4	1710
December	1st to 10th	Day	26% 40% 6% 12% 13% 4	1710
	11th to 20th	Day	30% 33% 7% 9% 15% 6%	2150
	21st to end	Day	33% 25% 4 15% 18% 5%	3124
January	1st to 10th	Night	31% 25% 5% 10% 16% 13%	4109
	11th to 20th	Night	33% 26% 4 12% 17% 8%	4052
	21st to end	Night	37% 24% 6% 11% 14% 8%	4180
February	1st to 10th	Night	27% 35% 5% 8% 16% 9%	2280
	11th to 20th	Night	29% 36% 4 8% 13% 11%	2219
	21st to end	Night	26% 35% 5% 12% 14% 8%	1884
March	1st to 10th	Night	22% 36% 6% 13% 16% 7%	2203
	11th to 20th	Night	20% 36% 8% 17% 13% 7%	2090
	21st to end	Night	20% 35% 9% 13% 16% 7%	2299
April	1st to 10th	Night	20% 38% 10% 13% 12% 7%	2003
	11th to 20th	Night	21% 37% 7% 13% 16% 6%	1807
	21st to end	Night	15% 38% 7% 19% 16% 6%	1760
May	1st to 10th	Night	15% 37% 10% 18% 16% 3	1620
	11th to 20th	Night	17% 41% 13% 15% 12% 2	1593
	21st to end	Night	16% 39% 12% 16% 15% 2	1745
June	1st to 10th	Night	21% 40% 14% 17% 7%	1620
	11th to 20th	Night	19% 40% 18% 18% 5%	1620
	21st to end	Night	23% 41% 16% 13% 6% 1	1620
July	1st to 10th	Night	29% 44% 15% 10% 2	1575
	11th to 20th	Night	23% 45% 19% 9% 3	1566
	21st to end	Night	19% 44% 25% 11% 1	1672
August	1st to 10th	Night	19% 43% 21% 14% 3	1755
	11th to 20th	Night	26% 44% 17% 12% 2	1776
	21st to end	Night	31% 44% 13% 9% 3 1	1994
September	1st to 10th	Night	29% 42% 14% 11% 3 1	1980
	11th to 20th	Night	32% 42% 11% 10% 5%	1980
	21st to end	Night	23% 40% 9% 11% 11% 4	1980
October	1st to 10th	Night	23% 38% 7% 11% 11% 10%	1980
	11th to 20th	Night	18% 37% 6% 13% 19% 7%	2011
	21st to end	Night	20% 39% 5% 8% 18% 10%	2376
November	1st to 10th	Night	13% 40% 5% 14% 15% 13%	2263
	11th to 20th	Night	19% 40% 4 11% 16% 10%	2470
	21st to end	Night	23% 40% 7% 11% 13% 6%	2470
December	1st to 10th	Night	21% 41% 7% 13% 14% 4	2470
	11th to 20th	Night	26% 34% 5% 12% 16% 7%	3044
	21st to end	Night	33% 25% 5% 16% 17% 4	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% 9% 32% 30% 14% 2	506
April	1st to 10th	Day	11% 9% 30% 32% 15% 2	428
	11th to 20th	Day	12% 6% 31% 30% 18% 3	412
	21st to end	Day	7% 4 26% 36% 23% 5%	420
May	1st to 10th	Day	5% 4 22% 38% 22% 7%	423
	11th to 20th	Day	7% 4 13% 32% 29% 14%	447
	21st to end	Day	9% 2 7% 30% 34% 18%	485
June	1st to 10th	Day	10% 1 7% 30% 34% 17%	450
	11th to 20th	Day	7% 2 8% 24% 35% 24%	450
	21st to end	Day	7% 2 4 24% 38% 26%	450
July	1st to 10th	Day	8% 3 4 14% 34% 37%	445
	11th to 20th	Day	6% 2 2 17% 38% 35%	444
	21st to end	Day	5% 2 3 18% 40% 31%	488
August	1st to 10th	Day	10% 2 2 16% 40% 30%	446
	11th to 20th	Day	9% 1 3 14% 37% 36%	439
	21st to end	Day	9% 2 7% 20% 37% 24%	495
September	1st to 10th	Day	8% 4 6% 18% 36% 28%	450
	11th to 20th	Day	9% 3 8% 24% 36% 19%	450
	21st to end	Day	12% 1 6% 23% 39% 19%	450
October	1st to 10th	Day	11% 3 16% 34% 29% 7%	450
	11th to 20th	Day	5% 2 14% 30% 38% 10%	450
	21st to end	Day	8% 4 19% 36% 29% 4	495
November	1st to 10th	Day	9% 5% 19% 37% 25% 6%	408
	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% 25% 37% 22% 1	729
	11th to 20th	Night	10% 6% 25% 33% 24% 2	565
	21st to end	Night	6% 4 21% 38% 28% 3	540
May	1st to 10th	Night	6% 2 18% 38% 30% 6%	540
	11th to 20th	Night	7% 2 15% 35% 36% 7%	531
	21st to end	Night	5% 1 6% 33% 44% 11%	584
June	1st to 10th	Night	10% 1 5% 28% 47% 9%	540
	11th to 20th	Night	4 2 4 27% 42% 21%	540
	21st to end	Night	6% 2 5% 21% 46% 21%	540
July	1st to 10th	Night	5% 2 5% 13% 46% 29%	525
	11th to 20th	Night	7% 2 2 9% 46% 35%	522
	21st to end	Night	3 1 1 11% 54% 29%	591
August	1st to 10th	Night	7% 1 2 12% 51% 27%	537
	11th to 20th	Night	6% 1 3 12% 49% 30%	534
	21st to end	Night	10% 2 5% 19% 40% 24%	608
September	1st to 10th	Night	8% 2 5% 22% 43% 19%	720
	11th to 20th	Night	10% 1 8% 29% 40% 12%	720
	21st to end	Night	9% 2 11% 28% 39% 10%	720
October	1st to 10th	Night	10% 2 19% 34% 31% 5%	720
	11th to 20th	Night	6% 3 17% 36% 31% 6%	720
	21st to end	Night	9% 4 18% 39% 27% 3	792
November	1st to 10th	Night	9% 4 24% 39% 23% 2	740
	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

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