Pane Observing Site
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pane Observing Site clear sky chart from 2005-11-06 to 2024-11-03.

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	16% 10% 4 8% 5% 5% 5% 4 5% 7% 31%	101098
	Night	18% 11% 4 8% 5% 4 4 3 5% 6% 33%	97803
Transparency	Day	51% 7% 12% 20% 10% 1	100908
	Night	51% 6% 11% 20% 11% 1	97663
Seeing	Day	22% 14% 27% 21% 11% 4	14690
	Night	21% 11% 27% 27% 12% 1	24365

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	20% 20% 9% 11% 5% 4 4 2 3 5% 18%	2818
	11th to 20th	Day	14% 23% 9% 14% 7% 4 3 2 3 3 18%	2840
	21st to end	Day	26% 20% 7% 14% 6% 3 3 2 4 4 11%	3124
February	1st to 10th	Day	21% 17% 5% 11% 7% 5% 3 2 4 5% 22%	1710
	11th to 20th	Day	17% 14% 6% 13% 6% 5% 4 3 5% 5% 22%	1663
	21st to end	Day	20% 15% 4 9% 6% 3 4 3 4 6% 25%	1570
March	1st to 10th	Day	22% 11% 5% 9% 5% 4 4 3 4 6% 27%	3435
	11th to 20th	Day	13% 12% 5% 9% 5% 6% 5% 3 4 5% 33%	3480
	21st to end	Day	20% 9% 3 8% 5% 4 4 4 6% 7% 31%	3815
April	1st to 10th	Day	15% 13% 4 8% 4 5% 4 4 5% 7% 30%	2189
	11th to 20th	Day	18% 10% 3 8% 5% 4 4 4 5% 6% 33%	2295
	21st to end	Day	22% 9% 3 7% 4 4 4 4 4 7% 32%	2470
May	1st to 10th	Day	24% 9% 3 8% 5% 4 5% 3 6% 6% 28%	4082
	11th to 20th	Day	19% 8% 3 9% 5% 5% 4 4 5% 7% 30%	4081
	21st to end	Day	13% 5% 2 6% 5% 5% 5% 5% 7% 9% 38%	4729
June	1st to 10th	Day	14% 7% 3 6% 5% 5% 5% 5% 7% 8% 34%	2660
	11th to 20th	Day	14% 7% 3 7% 5% 5% 5% 4 6% 9% 36%	2660
	21st to end	Day	13% 7% 2 7% 5% 5% 4 4 6% 9% 38%	2660
July	1st to 10th	Day	10% 6% 3 7% 5% 5% 6% 4 6% 8% 41%	4313
	11th to 20th	Day	11% 6% 2 6% 5% 5% 4 4 6% 10% 41%	4120
	21st to end	Day	12% 6% 2 7% 6% 6% 5% 5% 6% 7% 37%	4466
August	1st to 10th	Day	15% 6% 3 8% 6% 6% 6% 5% 7% 8% 31%	4104
	11th to 20th	Day	13% 6% 2 7% 6% 5% 6% 5% 7% 9% 36%	4044
	21st to end	Day	9% 4 2 7% 5% 6% 6% 5% 6% 9% 41%	4321
September	1st to 10th	Day	15% 7% 2 5% 3 3 5% 3 5% 8% 44%	2280
	11th to 20th	Day	11% 6% 2 5% 4 5% 5% 3 5% 9% 44%	2091
	21st to end	Day	19% 8% 2 8% 5% 4 4 3 4 6% 36%	2090
October	1st to 10th	Day	15% 6% 2 6% 4 4 5% 4 7% 8% 40%	1900
	11th to 20th	Day	19% 8% 2 8% 5% 5% 5% 3 5% 5% 34%	1900
	21st to end	Day	23% 10% 2 7% 4 4 4 3 5% 7% 31%	2090
November	1st to 10th	Day	12% 9% 3 7% 5% 4 5% 4 4 6% 42%	1792
	11th to 20th	Day	17% 14% 3 7% 5% 4 4 3 6% 5% 32%	1584
	21st to end	Day	17% 15% 5% 10% 5% 5% 4 4 4 5% 26%	1520
December	1st to 10th	Day	21% 19% 7% 11% 5% 3 3 4 4 5% 18%	1520
	11th to 20th	Day	20% 17% 6% 12% 5% 4 3 3 4 6% 20%	1910
	21st to end	Day	26% 23% 6% 10% 4 4 3 3 4 4 13%	2772
January	1st to 10th	Night	17% 20% 8% 12% 5% 4 4 3 4 4 18%	4109
	11th to 20th	Night	17% 18% 7% 14% 6% 6% 5% 3 4 4 16%	4120
	21st to end	Night	29% 15% 8% 12% 6% 3 3 2 3 3 16%	4532
February	1st to 10th	Night	21% 13% 4 10% 6% 4 4 3 4 5% 24%	2470
	11th to 20th	Night	19% 13% 4 12% 5% 5% 4 4 4 5% 25%	2403
	21st to end	Night	21% 13% 4 11% 5% 4 5% 3 4 5% 24%	1879
March	1st to 10th	Night	25% 11% 3 6% 4 3 3 3 4 5% 32%	3418
	11th to 20th	Night	18% 13% 5% 8% 3 3 3 2 4 7% 34%	3480
	21st to end	Night	18% 10% 3 7% 4 4 3 3 4 5% 39%	3817
April	1st to 10th	Night	18% 12% 3 7% 5% 4 4 3 4 6% 34%	1990
	11th to 20th	Night	18% 8% 3 7% 5% 5% 4 4 5% 6% 37%	1851
	21st to end	Night	15% 9% 3 6% 5% 3 4 4 6% 8% 37%	1710
May	1st to 10th	Night	26% 10% 3 6% 4 4 3 4 5% 7% 27%	2813
	11th to 20th	Night	17% 9% 2 7% 5% 4 4 4 5% 7% 36%	2812
	21st to end	Night	11% 6% 2 6% 4 4 5% 4 7% 10% 42%	2808
June	1st to 10th	Night	10% 6% 3 6% 5% 5% 4 4 7% 8% 43%	1520
	11th to 20th	Night	11% 5% 3 6% 4 5% 4 4 7% 9% 41%	1520
	21st to end	Night	10% 4 2 6% 5% 6% 5% 5% 6% 8% 44%	1520
July	1st to 10th	Night	12% 7% 2 7% 4 5% 4 4 6% 7% 42%	2642
	11th to 20th	Night	12% 4 2 6% 5% 4 4 4 6% 9% 44%	2840
	21st to end	Night	11% 7% 3 8% 5% 5% 5% 4 6% 7% 41%	3087
August	1st to 10th	Night	13% 7% 3 9% 5% 4 6% 4 7% 8% 35%	2825
	11th to 20th	Night	15% 7% 3 5% 4 4 4 3 5% 7% 42%	2785
	21st to end	Night	9% 4 2 6% 4 5% 5% 5% 6% 9% 44%	3302
September	1st to 10th	Night	13% 6% 1 4 4 3 5% 4 5% 6% 49%	1900
	11th to 20th	Night	10% 4 2 4 3 4 5% 3 5% 9% 51%	2085
	21st to end	Night	16% 8% 3 6% 4 4 4 4 5% 6% 40%	2090
October	1st to 10th	Night	14% 6% 2 5% 4 4 4 3 4 7% 46%	2279
	11th to 20th	Night	18% 8% 2 6% 5% 4 4 4 4 6% 40%	2280
	21st to end	Night	23% 8% 2 6% 3 3 4 3 5% 6% 36%	2508
November	1st to 10th	Night	14% 8% 3 6% 4 3 3 3 5% 7% 44%	2326
	11th to 20th	Night	19% 11% 3 7% 5% 4 4 4 5% 6% 32%	2593
	21st to end	Night	20% 13% 4 7% 5% 4 3 3 5% 5% 29%	2660
December	1st to 10th	Night	23% 17% 7% 9% 5% 4 4 3 4 5% 20%	2660
	11th to 20th	Night	19% 18% 6% 10% 5% 4 4 3 4 5% 23%	3285
	21st to end	Night	26% 19% 6% 10% 5% 4 4 3 4 5% 14%	4884

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	69% 6% 10% 12% 4	2819
	11th to 20th	Day	72% 3 8% 12% 3 1	2840
	21st to end	Day	77% 6% 8% 7% 2	3124
February	1st to 10th	Day	67% 4 8% 14% 7% 1	1710
	11th to 20th	Day	64% 5% 10% 14% 7%	1672
	21st to end	Day	61% 5% 11% 15% 7% 1	1570
March	1st to 10th	Day	56% 7% 10% 22% 6%	3435
	11th to 20th	Day	51% 6% 13% 21% 7% 1	3480
	21st to end	Day	51% 6% 11% 19% 11% 1	3815
April	1st to 10th	Day	52% 6% 11% 18% 11% 2	2189
	11th to 20th	Day	50% 7% 10% 17% 14% 2	2295
	21st to end	Day	51% 6% 10% 21% 9% 2	2470
May	1st to 10th	Day	55% 7% 11% 19% 8% 1	4120
	11th to 20th	Day	50% 8% 12% 21% 8% 1	4085
	21st to end	Day	38% 9% 15% 23% 11% 3	4743
June	1st to 10th	Day	44% 9% 13% 22% 11% 1	2660
	11th to 20th	Day	43% 7% 14% 22% 12% 1	2660
	21st to end	Day	41% 8% 12% 25% 12% 1	2660
July	1st to 10th	Day	40% 7% 12% 23% 14% 3	4246
	11th to 20th	Day	37% 6% 12% 28% 16%	4051
	21st to end	Day	44% 7% 12% 20% 17% 1	4324
August	1st to 10th	Day	48% 8% 14% 21% 9%	4091
	11th to 20th	Day	42% 7% 12% 28% 10% 1	4083
	21st to end	Day	37% 9% 12% 27% 13% 2	4321
September	1st to 10th	Day	39% 7% 10% 22% 19% 3	2280
	11th to 20th	Day	36% 7% 14% 26% 15% 1	2091
	21st to end	Day	49% 6% 11% 21% 13%	2090
October	1st to 10th	Day	40% 7% 14% 22% 16% 1	1900
	11th to 20th	Day	50% 6% 11% 22% 10% 1	1900
	21st to end	Day	52% 5% 13% 18% 11% 1	2090
November	1st to 10th	Day	43% 6% 10% 22% 17% 2	1792
	11th to 20th	Day	53% 4 12% 18% 10% 2	1584
	21st to end	Day	60% 5% 11% 16% 7% 1	1520
December	1st to 10th	Day	70% 4 10% 12% 3	1520
	11th to 20th	Day	66% 5% 10% 16% 3	1906
	21st to end	Day	74% 5% 10% 8% 2	2772
January	1st to 10th	Night	68% 5% 10% 13% 3	4109
	11th to 20th	Night	71% 6% 10% 10% 2	4120
	21st to end	Night	74% 4 7% 12% 3	4532
February	1st to 10th	Night	62% 5% 9% 17% 6%	2470
	11th to 20th	Night	61% 5% 10% 16% 7%	2405
	21st to end	Night	61% 6% 8% 14% 9% 1	1879
March	1st to 10th	Night	54% 5% 10% 22% 8%	3418
	11th to 20th	Night	51% 6% 12% 24% 6% 1	3480
	21st to end	Night	46% 6% 11% 23% 13% 1	3817
April	1st to 10th	Night	52% 5% 9% 19% 14% 2	1990
	11th to 20th	Night	46% 6% 12% 17% 15% 3	1851
	21st to end	Night	44% 7% 11% 23% 12% 3	1710
May	1st to 10th	Night	56% 6% 8% 18% 10% 2	2840
	11th to 20th	Night	46% 9% 11% 23% 10% 1	2813
	21st to end	Night	34% 10% 15% 24% 13% 4	2815
June	1st to 10th	Night	36% 8% 14% 24% 16% 2	1520
	11th to 20th	Night	37% 9% 15% 22% 15% 2	1520
	21st to end	Night	36% 9% 13% 24% 16% 2	1520
July	1st to 10th	Night	41% 7% 10% 22% 18% 2	2599
	11th to 20th	Night	35% 7% 15% 26% 16% 1	2786
	21st to end	Night	41% 7% 11% 17% 22% 3	2988
August	1st to 10th	Night	46% 8% 13% 21% 11% 1	2814
	11th to 20th	Night	40% 7% 10% 28% 15% 1	2812
	21st to end	Night	34% 8% 13% 29% 13% 2	3302
September	1st to 10th	Night	34% 7% 11% 23% 20% 5%	1900
	11th to 20th	Night	29% 8% 13% 26% 23% 1	2085
	21st to end	Night	43% 6% 11% 21% 17% 1	2090
October	1st to 10th	Night	39% 7% 13% 24% 15% 2	2279
	11th to 20th	Night	45% 5% 11% 23% 13% 2	2280
	21st to end	Night	49% 5% 10% 21% 13% 2	2508
November	1st to 10th	Night	41% 5% 12% 22% 17% 3	2326
	11th to 20th	Night	52% 5% 11% 20% 10% 2	2593
	21st to end	Night	56% 5% 11% 21% 6% 1	2660
December	1st to 10th	Night	66% 5% 11% 13% 4	2660
	11th to 20th	Night	64% 5% 12% 16% 3	3288
	21st to end	Night	72% 6% 11% 9% 2	4884

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	29% 29% 25% 13% 3 1	267
	11th to 20th	Day	33% 26% 30% 9% 1	270
	21st to end	Day	27% 30% 29% 10% 3 1	297
February	1st to 10th	Day	33% 19% 37% 10% 1	270
	11th to 20th	Day	34% 28% 30% 7% 1	270
	21st to end	Day	37% 23% 30% 9%	249
March	1st to 10th	Day	29% 21% 29% 18% 3	460
	11th to 20th	Day	32% 19% 30% 13% 4 1	460
	21st to end	Day	31% 20% 27% 17% 5% 1	506
April	1st to 10th	Day	29% 20% 26% 17% 7% 1	460
	11th to 20th	Day	23% 21% 27% 17% 8% 4	452
	21st to end	Day	28% 17% 31% 17% 6% 2	460
May	1st to 10th	Day	27% 19% 25% 18% 7% 3	463
	11th to 20th	Day	21% 14% 31% 20% 10% 4	487
	21st to end	Day	15% 8% 26% 27% 18% 5%	529
June	1st to 10th	Day	14% 12% 30% 26% 14% 4	490
	11th to 20th	Day	17% 12% 25% 26% 16% 4	490
	21st to end	Day	15% 10% 32% 28% 13% 3	490
July	1st to 10th	Day	11% 7% 21% 30% 22% 9%	485
	11th to 20th	Day	13% 7% 26% 26% 20% 8%	484
	21st to end	Day	13% 6% 25% 30% 18% 8%	532
August	1st to 10th	Day	10% 6% 24% 31% 20% 9%	486
	11th to 20th	Day	14% 6% 23% 29% 17% 10%	479
	21st to end	Day	12% 5% 23% 28% 22% 11%	539
September	1st to 10th	Day	16% 8% 22% 28% 19% 8%	490
	11th to 20th	Day	11% 5% 19% 31% 22% 11%	490
	21st to end	Day	23% 11% 24% 23% 14% 4	490
October	1st to 10th	Day	17% 9% 28% 24% 18% 4	490
	11th to 20th	Day	22% 16% 29% 22% 8% 2	490
	21st to end	Day	29% 14% 31% 18% 7%	539
November	1st to 10th	Day	19% 19% 32% 17% 12% 2	378
	11th to 20th	Day	31% 18% 29% 15% 6% 1	210
	21st to end	Day	26% 21% 41% 11% 2	180
December	1st to 10th	Day	31% 27% 27% 10% 4 2	180
	11th to 20th	Day	32% 20% 33% 13% 2	180
	21st to end	Day	35% 20% 29% 13% 3	198
January	1st to 10th	Night	28% 22% 32% 16% 3	760
	11th to 20th	Night	32% 17% 31% 18% 3	760
	21st to end	Night	26% 19% 31% 20% 4	836
February	1st to 10th	Night	28% 16% 29% 25% 3	760
	11th to 20th	Night	30% 18% 34% 17% 1	743
	21st to end	Night	29% 16% 33% 19% 3	628
March	1st to 10th	Night	25% 17% 31% 23% 3	760
	11th to 20th	Night	25% 19% 28% 22% 5% 1	760
	21st to end	Night	23% 16% 32% 23% 5% 1	836
April	1st to 10th	Night	23% 16% 30% 25% 5%	760
	11th to 20th	Night	21% 13% 32% 23% 9% 1	727
	21st to end	Night	19% 10% 35% 31% 6%	570
May	1st to 10th	Night	21% 10% 26% 32% 9% 1	570
	11th to 20th	Night	19% 7% 28% 32% 13% 1	561
	21st to end	Night	12% 3 22% 37% 23% 3	462
June	1st to 10th	Night	10% 4 28% 39% 19% 1	380
	11th to 20th	Night	12% 4 24% 39% 19% 1	380
	21st to end	Night	10% 3 28% 37% 21% 1	380
July	1st to 10th	Night	9% 2 20% 42% 22% 6%	437
	11th to 20th	Night	8% 3 20% 36% 28% 4	552
	21st to end	Night	11% 3 15% 42% 27% 2	624
August	1st to 10th	Night	10% 1 17% 42% 27% 2	567
	11th to 20th	Night	10% 4 15% 38% 29% 4	564
	21st to end	Night	12% 3 21% 34% 25% 6%	727
September	1st to 10th	Night	16% 3 19% 33% 26% 4	760
	11th to 20th	Night	11% 3 17% 34% 31% 3	760
	21st to end	Night	19% 8% 24% 26% 19% 4	760
October	1st to 10th	Night	18% 7% 23% 29% 22% 2	760
	11th to 20th	Night	22% 11% 29% 26% 11% 1	760
	21st to end	Night	27% 12% 26% 27% 8%	836
November	1st to 10th	Night	18% 10% 27% 32% 13%	749
	11th to 20th	Night	26% 15% 27% 23% 7% 1	760
	21st to end	Night	27% 15% 29% 23% 6%	760
December	1st to 10th	Night	32% 17% 27% 19% 4	760
	11th to 20th	Night	27% 19% 30% 21% 3	760
	21st to end	Night	29% 16% 33% 22% 1	836

Page generated at 2024-10-31 03:39:22. Version ac07

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