Home of the Bird Paparazzi
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Home of the Bird Paparazzi clear sky chart from 2005-11-06 to 2025-11-03.

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	17% 7% 2 6% 4 4 4 4 5% 7% 38%	126528
	Night	17% 7% 2 6% 4 4 4 3 5% 6% 41%	123515
Transparency	Day	28% 39% 7% 14% 10% 2	130048
	Night	28% 39% 8% 14% 11% 2	128082
Seeing	Day	24% 16% 31% 19% 8% 2	16250
	Night	22% 15% 32% 24% 7%	25123

By Month

Percentage Cloud Cover NE (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	12% 6% 3 9% 5% 5% 5% 4 6% 6% 39%	3597
	11th to 20th	Day	12% 7% 3 7% 4 4 4 4 5% 5% 45%	3570
	21st to end	Day	16% 9% 2 6% 4 3 4 3 4 5% 44%	3960
February	1st to 10th	Day	17% 8% 3 5% 6% 5% 4 5% 6% 5% 36%	1834
	11th to 20th	Day	13% 7% 2 9% 4 5% 5% 4 5% 8% 39%	1948
	21st to end	Day	17% 11% 2 7% 5% 5% 4 3 5% 5% 37%	1650
March	1st to 10th	Day	20% 10% 4 7% 4 4 4 3 4 5% 35%	4476
	11th to 20th	Day	16% 9% 2 5% 4 5% 4 4 5% 6% 40%	4740
	21st to end	Day	25% 9% 2 5% 4 3 3 3 5% 6% 34%	5828
April	1st to 10th	Day	18% 10% 3 7% 5% 4 4 3 4 5% 37%	2400
	11th to 20th	Day	17% 7% 3 5% 4 4 5% 4 6% 7% 38%	2379
	21st to end	Day	20% 7% 3 7% 4 5% 5% 4 4 6% 36%	2600
May	1st to 10th	Day	31% 10% 3 6% 4 4 4 3 5% 6% 25%	5886
	11th to 20th	Day	20% 7% 3 9% 5% 5% 5% 5% 5% 6% 31%	6079
	21st to end	Day	19% 6% 3 6% 5% 4 4 3 6% 8% 35%	6949
June	1st to 10th	Day	19% 6% 1 6% 5% 5% 5% 4 7% 8% 34%	2800
	11th to 20th	Day	16% 6% 2 7% 4 5% 5% 4 6% 8% 37%	2800
	21st to end	Day	18% 6% 2 6% 5% 4 5% 4 6% 8% 36%	2800
July	1st to 10th	Day	15% 6% 2 6% 5% 5% 6% 4 6% 9% 34%	6360
	11th to 20th	Day	8% 5% 2 7% 5% 5% 6% 4 8% 11% 38%	6360
	21st to end	Day	14% 6% 2 6% 4 4 4 3 6% 7% 43%	6926
August	1st to 10th	Day	14% 6% 2 7% 5% 5% 6% 4 7% 8% 36%	4344
	11th to 20th	Day	14% 7% 2 6% 5% 5% 5% 4 6% 8% 38%	4092
	21st to end	Day	8% 4 2 6% 5% 5% 5% 5% 8% 10% 43%	4312
September	1st to 10th	Day	13% 5% 1 5% 4 4 4 4 5% 7% 47%	2400
	11th to 20th	Day	14% 6% 2 4 3 3 3 2 4 5% 52%	2214
	21st to end	Day	16% 5% 2 6% 4 4 4 4 5% 7% 44%	2200
October	1st to 10th	Day	22% 6% 2 6% 4 3 4 4 4 5% 41%	2200
	11th to 20th	Day	16% 5% 1 5% 4 4 4 4 5% 7% 46%	1934
	21st to end	Day	21% 6% 2 6% 4 3 4 3 4 6% 40%	1980
November	1st to 10th	Day	14% 6% 2 5% 4 3 3 3 4 5% 50%	1779
	11th to 20th	Day	18% 6% 1 4 4 3 3 3 5% 5% 48%	1800
	21st to end	Day	19% 7% 2 5% 5% 4 4 3 5% 5% 43%	1785
December	1st to 10th	Day	16% 7% 2 6% 3 4 4 3 6% 6% 43%	2600
	11th to 20th	Day	21% 6% 2 5% 3 4 3 3 5% 6% 45%	2986
	21st to end	Day	19% 11% 3 6% 4 3 4 3 4 6% 37%	3960
January	1st to 10th	Night	13% 6% 2 6% 4 4 4 4 5% 6% 46%	6349
	11th to 20th	Night	12% 8% 3 9% 5% 4 5% 4 5% 6% 40%	6315
	21st to end	Night	15% 10% 4 7% 5% 4 4 3 4 5% 38%	6996
February	1st to 10th	Night	15% 10% 2 6% 4 4 4 5% 5% 6% 38%	2561
	11th to 20th	Night	13% 8% 3 6% 5% 5% 5% 4 5% 6% 40%	2338
	21st to end	Night	15% 9% 2 7% 4 4 4 4 5% 6% 41%	1980
March	1st to 10th	Night	23% 8% 2 5% 4 4 3 3 5% 6% 38%	5364
	11th to 20th	Night	15% 10% 3 7% 5% 4 5% 3 5% 6% 38%	5219
	21st to end	Night	24% 9% 2 5% 3 4 4 3 5% 6% 34%	5100
April	1st to 10th	Night	19% 9% 3 6% 5% 4 4 3 5% 6% 36%	2000
	11th to 20th	Night	20% 7% 2 5% 4 3 4 4 5% 6% 40%	1970
	21st to end	Night	21% 6% 3 6% 3 4 4 3 4 5% 40%	1800
May	1st to 10th	Night	33% 10% 3 6% 4 3 3 3 4 7% 25%	4054
	11th to 20th	Night	16% 8% 3 8% 5% 5% 6% 4 7% 7% 30%	3855
	21st to end	Night	21% 7% 3 7% 5% 4 4 3 5% 7% 33%	3926
June	1st to 10th	Night	18% 8% 4 6% 5% 4 4 3 4 7% 39%	1600
	11th to 20th	Night	19% 5% 2 5% 4 4 4 4 6% 8% 39%	1600
	21st to end	Night	17% 6% 2 6% 4 4 4 4 7% 7% 40%	1600
July	1st to 10th	Night	13% 6% 2 6% 5% 4 5% 4 6% 9% 41%	3600
	11th to 20th	Night	12% 6% 2 7% 4 4 5% 4 6% 8% 42%	3600
	21st to end	Night	12% 5% 2 5% 4 4 4 3 5% 6% 50%	3926
August	1st to 10th	Night	20% 6% 3 7% 4 5% 5% 4 5% 6% 36%	2772
	11th to 20th	Night	12% 8% 3 7% 5% 5% 6% 4 6% 7% 38%	2938
	21st to end	Night	9% 4 1 4 2 3 3 3 5% 8% 57%	3586
September	1st to 10th	Night	14% 5% 2 5% 3 3 3 3 4 7% 51%	2000
	11th to 20th	Night	13% 5% 2 4 3 3 2 3 5% 6% 54%	2185
	21st to end	Night	17% 4 2 6% 4 2 4 3 5% 7% 46%	2200
October	1st to 10th	Night	21% 6% 2 5% 4 4 3 3 4 5% 44%	2200
	11th to 20th	Night	17% 4 2 4 3 4 4 4 6% 6% 47%	2463
	21st to end	Night	22% 7% 2 5% 3 3 4 3 4 6% 39%	2860
November	1st to 10th	Night	15% 6% 2 5% 3 4 4 3 5% 6% 48%	2564
	11th to 20th	Night	17% 6% 2 5% 4 4 3 3 4 5% 47%	2600
	21st to end	Night	17% 7% 2 4 4 4 3 3 5% 6% 45%	2610
December	1st to 10th	Night	17% 9% 2 6% 4 3 4 3 5% 6% 40%	4580
	11th to 20th	Night	22% 8% 2 6% 3 3 3 3 4 5% 42%	5208
	21st to end	Night	18% 10% 3 6% 4 4 4 3 5% 6% 39%	6996

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	34% 27% 7% 19% 12% 1	3598
	11th to 20th	Day	27% 28% 8% 18% 15% 4	3600
	21st to end	Day	33% 30% 5% 14% 16% 3	3960
February	1st to 10th	Day	17% 62% 7% 8% 5% 1	1834
	11th to 20th	Day	19% 61% 3 7% 9% 2	1957
	21st to end	Day	16% 62% 5% 9% 7% 1	1650
March	1st to 10th	Day	40% 30% 5% 8% 8% 9%	4479
	11th to 20th	Day	30% 32% 11% 18% 9% 1	4740
	21st to end	Day	39% 29% 5% 11% 12% 5%	5828
April	1st to 10th	Day	22% 62% 2 7% 5% 2	2400
	11th to 20th	Day	16% 63% 4 8% 8% 1	2379
	21st to end	Day	19% 62% 3 7% 8% 1	2600
May	1st to 10th	Day	46% 32% 9% 8% 5%	5897
	11th to 20th	Day	40% 32% 11% 11% 5%	6083
	21st to end	Day	35% 31% 8% 15% 9%	6949
June	1st to 10th	Day	16% 63% 5% 10% 7%	2800
	11th to 20th	Day	16% 62% 5% 9% 7% 1	2800
	21st to end	Day	16% 62% 5% 9% 7% 1	2800
July	1st to 10th	Day	35% 28% 10% 15% 12%	6290
	11th to 20th	Day	28% 29% 13% 19% 10% 1	6285
	21st to end	Day	30% 26% 8% 21% 14% 1	6728
August	1st to 10th	Day	30% 38% 10% 15% 6%	4330
	11th to 20th	Day	28% 39% 10% 17% 6%	4131
	21st to end	Day	19% 38% 9% 20% 12% 1	4312
September	1st to 10th	Day	15% 58% 6% 13% 8% 1	2400
	11th to 20th	Day	17% 57% 4 9% 12% 1	2214
	21st to end	Day	18% 57% 4 11% 8% 1	2200
October	1st to 10th	Day	27% 38% 5% 14% 14% 2	3590
	11th to 20th	Day	19% 37% 5% 19% 19% 3	3124
	21st to end	Day	19% 36% 5% 24% 14% 2	3180
November	1st to 10th	Day	18% 55% 7% 11% 8% 1	1779
	11th to 20th	Day	17% 56% 4 7% 14% 2	1800
	21st to end	Day	17% 57% 6% 11% 8% 1	1785
December	1st to 10th	Day	25% 37% 10% 22% 6%	2600
	11th to 20th	Day	29% 32% 8% 13% 15% 4	2986
	21st to end	Day	36% 28% 5% 14% 11% 5%	3960
January	1st to 10th	Night	27% 28% 8% 24% 11% 2	6349
	11th to 20th	Night	31% 28% 10% 16% 11% 3	6360
	21st to end	Night	37% 29% 7% 11% 12% 5%	6996
February	1st to 10th	Night	18% 62% 5% 8% 6% 1	2561
	11th to 20th	Night	17% 61% 5% 6% 8% 2	2340
	21st to end	Night	17% 62% 3 9% 6% 3	1980
March	1st to 10th	Night	36% 30% 7% 9% 12% 6%	5374
	11th to 20th	Night	32% 32% 12% 13% 9% 1	5220
	21st to end	Night	39% 29% 4 8% 16% 5%	5100
April	1st to 10th	Night	22% 62% 3 6% 6% 2	2000
	11th to 20th	Night	18% 63% 4 6% 8% 1	1970
	21st to end	Night	18% 62% 4 7% 9% 1	1800
May	1st to 10th	Night	46% 31% 10% 8% 5%	4060
	11th to 20th	Night	38% 34% 11% 11% 6%	3856
	21st to end	Night	39% 31% 10% 12% 7% 1	3927
June	1st to 10th	Night	17% 62% 3 11% 8%	1600
	11th to 20th	Night	15% 64% 6% 10% 6%	1600
	21st to end	Night	15% 61% 4 12% 6% 1	1600
July	1st to 10th	Night	29% 28% 11% 19% 12%	3560
	11th to 20th	Night	30% 29% 14% 13% 13% 1	3552
	21st to end	Night	26% 27% 8% 25% 13%	3809
August	1st to 10th	Night	34% 38% 8% 12% 7% 1	2762
	11th to 20th	Night	29% 39% 10% 16% 6%	2965
	21st to end	Night	13% 37% 12% 22% 15% 1	3586
September	1st to 10th	Night	14% 57% 5% 13% 10%	2000
	11th to 20th	Night	15% 57% 4 11% 13% 1	2185
	21st to end	Night	19% 58% 4 13% 7% 1	2200
October	1st to 10th	Night	23% 37% 11% 17% 11% 1	3590
	11th to 20th	Night	14% 36% 7% 18% 22% 3	4012
	21st to end	Night	20% 36% 7% 25% 10% 1	4610
November	1st to 10th	Night	18% 56% 4 12% 9% 2	2564
	11th to 20th	Night	16% 56% 4 8% 13% 2	2600
	21st to end	Night	16% 57% 7% 12% 8% 1	2610
December	1st to 10th	Night	30% 37% 7% 19% 8%	4580
	11th to 20th	Night	33% 32% 8% 8% 16% 1	5208
	21st to end	Night	34% 29% 6% 16% 12% 3	6996

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	34% 23% 27% 13% 4	200
	11th to 20th	Day	31% 23% 33% 11% 2 1	200
	21st to end	Day	30% 22% 32% 12% 4	220
February	1st to 10th	Day	31% 26% 30% 11% 2	369
	11th to 20th	Day	32% 28% 28% 11% 1	496
	21st to end	Day	29% 24% 30% 14% 3	414
March	1st to 10th	Day	32% 21% 32% 12% 3	500
	11th to 20th	Day	31% 25% 29% 10% 4 1	500
	21st to end	Day	33% 21% 30% 11% 4 1	550
April	1st to 10th	Day	33% 22% 27% 11% 5% 1	500
	11th to 20th	Day	32% 21% 28% 12% 5% 1	492
	21st to end	Day	29% 19% 31% 14% 6% 1	500
May	1st to 10th	Day	33% 20% 28% 14% 4 1	503
	11th to 20th	Day	22% 17% 37% 17% 5% 2	527
	21st to end	Day	19% 15% 35% 24% 6% 1	573
June	1st to 10th	Day	19% 15% 38% 17% 9% 2	530
	11th to 20th	Day	17% 16% 36% 21% 8% 2	530
	21st to end	Day	19% 13% 36% 21% 8% 3	530
July	1st to 10th	Day	18% 10% 30% 27% 12% 3	525
	11th to 20th	Day	11% 8% 34% 30% 12% 3	524
	21st to end	Day	13% 9% 36% 32% 9% 2	576
August	1st to 10th	Day	13% 8% 30% 30% 14% 4	526
	11th to 20th	Day	16% 8% 28% 27% 16% 4	519
	21st to end	Day	12% 10% 33% 27% 14% 4	583
September	1st to 10th	Day	18% 10% 28% 22% 15% 6%	530
	11th to 20th	Day	19% 10% 26% 20% 15% 10%	530
	21st to end	Day	19% 12% 31% 22% 11% 5%	530
October	1st to 10th	Day	27% 13% 23% 20% 11% 5%	530
	11th to 20th	Day	21% 16% 30% 20% 11% 2	475
	21st to end	Day	29% 15% 29% 20% 6% 1	462
November	1st to 10th	Day	21% 18% 28% 22% 8% 2	401
	11th to 20th	Day	33% 17% 25% 20% 5% 1	400
	21st to end	Day	31% 19% 28% 16% 5% 1	385
December	1st to 10th	Day	24% 28% 29% 14% 7%	200
	11th to 20th	Day	35% 23% 29% 11% 3	200
	21st to end	Day	27% 22% 29% 16% 4 1	220
January	1st to 10th	Night	23% 23% 35% 16% 3	800
	11th to 20th	Night	27% 20% 32% 18% 3	800
	21st to end	Night	21% 20% 38% 18% 3	880
February	1st to 10th	Night	22% 20% 37% 20% 1	800
	11th to 20th	Night	24% 23% 36% 15% 1	783
	21st to end	Night	24% 22% 34% 18% 2	660
March	1st to 10th	Night	26% 21% 33% 18% 2	800
	11th to 20th	Night	24% 21% 33% 19% 4	800
	21st to end	Night	27% 19% 33% 18% 4	880
April	1st to 10th	Night	26% 19% 33% 19% 4	800
	11th to 20th	Night	24% 21% 33% 18% 4	786
	21st to end	Night	25% 19% 33% 20% 3	600
May	1st to 10th	Night	26% 14% 35% 20% 4	600
	11th to 20th	Night	21% 15% 34% 25% 5%	518
	21st to end	Night	20% 8% 35% 30% 6%	433
June	1st to 10th	Night	19% 11% 34% 28% 9% 1	400
	11th to 20th	Night	19% 9% 31% 33% 7% 1	400
	21st to end	Night	18% 5% 35% 36% 8%	400
July	1st to 10th	Night	16% 7% 29% 38% 9% 1	390
	11th to 20th	Night	13% 4 27% 43% 12% 1	388
	21st to end	Night	13% 5% 30% 42% 11%	438
August	1st to 10th	Night	15% 4 28% 39% 14%	506
	11th to 20th	Night	14% 7% 28% 37% 14% 1	632
	21st to end	Night	14% 5% 25% 39% 16% 1	880
September	1st to 10th	Night	15% 6% 31% 33% 14% 1	800
	11th to 20th	Night	15% 7% 27% 29% 19% 2	800
	21st to end	Night	19% 8% 28% 30% 13% 2	800
October	1st to 10th	Night	24% 10% 24% 27% 13% 1	800
	11th to 20th	Night	20% 11% 33% 25% 10% 1	800
	21st to end	Night	26% 15% 30% 23% 5%	880
November	1st to 10th	Night	19% 14% 33% 26% 7% 1	789
	11th to 20th	Night	22% 18% 32% 20% 6% 1	800
	21st to end	Night	25% 18% 31% 20% 5% 1	800
December	1st to 10th	Night	26% 19% 36% 17% 4	800
	11th to 20th	Night	26% 21% 32% 18% 3	800
	21st to end	Night	25% 20% 34% 19% 3	880

Page generated at 2025-10-31 02:02:36. Version ac07

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