Pushapatapa Creek Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pushapatapa Creek Observatory clear sky chart from 2005-11-06 to 2026-02-16.

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	12% 6% 2 6% 5% 5% 5% 4 6% 8% 40%	130242
	Night	13% 6% 2 6% 4 4 4 4 5% 7% 44%	130629
Transparency	Day	40% 7% 12% 18% 17% 7%	133941
	Night	38% 6% 12% 18% 18% 9%	135005
Seeing	Day	14% 9% 21% 25% 21% 10%	16424
	Night	15% 8% 22% 29% 21% 5%	26148

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	17% 6% 4 7% 4 3 4 3 5% 6% 41%	5289
	11th to 20th	Day	11% 5% 3 5% 4 4 4 3 4 5% 53%	5310
	21st to end	Day	22% 9% 3 7% 3 4 4 3 4 5% 36%	6416
February	1st to 10th	Day	16% 9% 3 6% 5% 4 4 3 5% 5% 40%	2100
	11th to 20th	Day	18% 7% 3 5% 5% 4 3 3 5% 7% 40%	1998
	21st to end	Day	17% 7% 2 7% 4 5% 4 3 5% 6% 38%	1650
March	1st to 10th	Day	20% 9% 3 7% 5% 4 4 3 5% 6% 34%	4618
	11th to 20th	Day	15% 6% 2 6% 4 4 4 3 5% 7% 44%	4980
	21st to end	Day	14% 8% 3 8% 5% 5% 5% 3 4 5% 40%	5773
April	1st to 10th	Day	13% 7% 3 6% 5% 4 6% 4 5% 7% 40%	2400
	11th to 20th	Day	15% 6% 3 6% 3 4 4 4 6% 7% 42%	2374
	21st to end	Day	8% 6% 2 6% 5% 4 5% 5% 6% 8% 45%	2400
May	1st to 10th	Day	18% 7% 2 7% 4 5% 5% 4 6% 8% 33%	5405
	11th to 20th	Day	10% 5% 2 6% 5% 5% 6% 4 7% 9% 41%	5404
	21st to end	Day	7% 5% 2 6% 6% 5% 6% 5% 7% 11% 41%	5949
June	1st to 10th	Day	10% 6% 3 7% 6% 7% 6% 5% 9% 9% 32%	2600
	11th to 20th	Day	6% 5% 3 7% 7% 8% 7% 5% 8% 11% 34%	2782
	21st to end	Day	7% 7% 2 8% 7% 8% 7% 7% 9% 11% 27%	2629
July	1st to 10th	Day	6% 5% 3 8% 7% 8% 8% 7% 10% 11% 28%	5900
	11th to 20th	Day	6% 5% 2 7% 7% 7% 8% 7% 9% 11% 31%	5854
	21st to end	Day	7% 6% 3 9% 6% 7% 8% 6% 9% 13% 27%	5922
August	1st to 10th	Day	3 3 2 5% 5% 4 5% 4 6% 9% 54%	3905
	11th to 20th	Day	7% 4 2 7% 5% 5% 6% 5% 7% 10% 42%	3849
	21st to end	Day	9% 6% 3 8% 7% 6% 7% 5% 7% 8% 35%	4312
September	1st to 10th	Day	11% 7% 2 8% 5% 6% 6% 4 6% 8% 36%	2400
	11th to 20th	Day	11% 6% 2 8% 6% 5% 5% 4 6% 8% 42%	2327
	21st to end	Day	9% 5% 2 5% 5% 4 5% 4 5% 7% 51%	2200
October	1st to 10th	Day	7% 5% 2 5% 3 4 4 4 6% 5% 54%	2131
	11th to 20th	Day	8% 4 1 5% 4 3 4 3 4 7% 57%	2000
	21st to end	Day	9% 5% 1 4 4 3 3 3 4 6% 56%	2200
November	1st to 10th	Day	10% 5% 2 5% 4 3 4 3 5% 6% 51%	2058
	11th to 20th	Day	11% 6% 2 4 3 4 4 3 5% 6% 54%	1932
	21st to end	Day	14% 7% 3 5% 4 4 3 3 6% 6% 45%	1890
December	1st to 10th	Day	17% 7% 3 6% 4 4 4 4 5% 5% 42%	3020
	11th to 20th	Day	11% 8% 3 6% 4 4 4 3 5% 5% 46%	3463
	21st to end	Day	18% 7% 2 6% 3 3 4 3 5% 5% 44%	4802
January	1st to 10th	Night	20% 7% 3 5% 3 3 3 2 4 5% 43%	7634
	11th to 20th	Night	15% 7% 3 5% 3 3 3 2 3 5% 49%	7666
	21st to end	Night	24% 9% 2 7% 4 4 3 3 4 5% 36%	7745
February	1st to 10th	Night	18% 7% 3 5% 4 4 4 3 5% 6% 42%	2520
	11th to 20th	Night	22% 8% 3 5% 4 4 3 2 4 6% 39%	2399
	21st to end	Night	20% 8% 2 5% 4 4 4 3 5% 5% 38%	1980
March	1st to 10th	Night	20% 10% 3 6% 4 3 3 3 5% 6% 36%	5263
	11th to 20th	Night	14% 7% 2 6% 4 4 4 3 5% 6% 47%	4980
	21st to end	Night	18% 7% 2 5% 3 3 4 4 5% 5% 44%	5153
April	1st to 10th	Night	16% 7% 2 5% 5% 4 3 3 4 7% 44%	2000
	11th to 20th	Night	14% 5% 2 6% 5% 3 5% 3 4 6% 46%	1975
	21st to end	Night	9% 4 2 5% 3 3 4 3 6% 6% 56%	2000
May	1st to 10th	Night	17% 7% 2 7% 4 4 4 3 5% 7% 38%	4490
	11th to 20th	Night	12% 7% 2 6% 4 4 3 3 6% 9% 44%	4489
	21st to end	Night	8% 5% 2 6% 4 5% 5% 5% 8% 13% 40%	4882
June	1st to 10th	Night	9% 5% 2 7% 6% 4 4 5% 8% 10% 40%	1800
	11th to 20th	Night	3 5% 1 6% 5% 5% 5% 6% 8% 9% 47%	1610
	21st to end	Night	6% 5% 2 6% 6% 6% 7% 5% 7% 11% 39%	1758
July	1st to 10th	Night	4 5% 2 7% 6% 6% 7% 5% 9% 12% 35%	4078
	11th to 20th	Night	4 4 2 6% 5% 6% 6% 6% 9% 14% 38%	4116
	21st to end	Night	6% 6% 3 8% 6% 7% 6% 6% 8% 12% 31%	4929
August	1st to 10th	Night	2 2 1 4 3 4 4 4 8% 12% 56%	3244
	11th to 20th	Night	4 3 1 5% 4 5% 7% 5% 9% 13% 44%	3200
	21st to end	Night	6% 6% 3 8% 5% 6% 5% 6% 7% 8% 39%	3586
September	1st to 10th	Night	8% 5% 2 7% 6% 6% 6% 4 8% 8% 40%	2000
	11th to 20th	Night	9% 5% 2 6% 5% 5% 5% 4 7% 9% 44%	2050
	21st to end	Night	9% 4 2 6% 4 5% 4 3 5% 7% 52%	2200
October	1st to 10th	Night	8% 4 2 5% 3 4 3 3 5% 6% 58%	2263
	11th to 20th	Night	7% 4 2 4 3 3 3 3 5% 5% 62%	2400
	21st to end	Night	12% 5% 2 5% 3 3 3 3 4 4 58%	2640
November	1st to 10th	Night	11% 5% 1 4 3 3 3 3 4 5% 57%	2460
	11th to 20th	Night	13% 5% 1 3 3 3 4 3 5% 5% 55%	2683
	21st to end	Night	13% 7% 2 6% 3 4 4 3 5% 6% 48%	2730
December	1st to 10th	Night	18% 8% 2 5% 4 4 4 3 5% 5% 44%	4380
	11th to 20th	Night	14% 9% 2 6% 4 4 3 3 5% 5% 46%	4952
	21st to end	Night	21% 8% 2 6% 3 3 3 2 3 5% 45%	6374

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	44% 4 7% 18% 23% 5%	5290
	11th to 20th	Day	34% 3 4 18% 30% 11%	5310
	21st to end	Day	52% 2 6% 11% 16% 14%	6416
February	1st to 10th	Day	46% 4 7% 14% 19% 10%	2100
	11th to 20th	Day	44% 4 7% 16% 20% 9%	2008
	21st to end	Day	47% 6% 7% 14% 17% 10%	1650
March	1st to 10th	Day	49% 5% 6% 13% 17% 9%	4618
	11th to 20th	Day	39% 5% 7% 14% 18% 17%	4980
	21st to end	Day	46% 5% 9% 14% 17% 8%	5775
April	1st to 10th	Day	42% 7% 9% 16% 17% 9%	2400
	11th to 20th	Day	41% 6% 8% 17% 19% 9%	2374
	21st to end	Day	35% 7% 11% 20% 22% 5%	2400
May	1st to 10th	Day	45% 8% 13% 20% 11% 2	5440
	11th to 20th	Day	37% 5% 16% 23% 17% 1	5408
	21st to end	Day	34% 8% 15% 28% 12% 2	5963
June	1st to 10th	Day	43% 11% 15% 21% 9% 2	2600
	11th to 20th	Day	40% 10% 17% 18% 12% 2	2782
	21st to end	Day	46% 12% 16% 18% 7% 1	2629
July	1st to 10th	Day	44% 11% 23% 16% 5%	5836
	11th to 20th	Day	42% 11% 31% 14% 1	5785
	21st to end	Day	45% 11% 18% 22% 3	5752
August	1st to 10th	Day	25% 8% 13% 28% 25% 1	3893
	11th to 20th	Day	36% 8% 18% 26% 12% 1	3885
	21st to end	Day	45% 9% 14% 15% 15% 2	4311
September	1st to 10th	Day	44% 10% 13% 16% 12% 4	2400
	11th to 20th	Day	41% 7% 11% 18% 17% 6%	2327
	21st to end	Day	33% 6% 11% 22% 19% 9%	2200
October	1st to 10th	Day	27% 4 6% 11% 23% 29%	3469
	11th to 20th	Day	17% 3 5% 16% 28% 30%	3240
	21st to end	Day	22% 3 4 13% 37% 20%	3538
November	1st to 10th	Day	33% 4 7% 17% 26% 13%	2058
	11th to 20th	Day	31% 5% 7% 16% 30% 13%	1932
	21st to end	Day	39% 4 8% 16% 22% 11%	1890
December	1st to 10th	Day	44% 4 7% 16% 23% 7%	3020
	11th to 20th	Day	40% 4 9% 15% 22% 10%	3460
	21st to end	Day	41% 5% 7% 18% 25% 4	4802
January	1st to 10th	Night	44% 3 9% 16% 22% 6%	7635
	11th to 20th	Night	39% 3 3 16% 25% 13%	7666
	21st to end	Night	53% 2 5% 12% 18% 9%	7745
February	1st to 10th	Night	43% 4 7% 16% 20% 10%	2520
	11th to 20th	Night	48% 4 5% 14% 19% 11%	2400
	21st to end	Night	46% 6% 8% 14% 13% 12%	1980
March	1st to 10th	Night	48% 5% 8% 11% 20% 8%	5263
	11th to 20th	Night	37% 7% 7% 14% 19% 15%	4980
	21st to end	Night	41% 5% 9% 20% 17% 8%	5153
April	1st to 10th	Night	41% 5% 9% 16% 17% 11%	2000
	11th to 20th	Night	38% 4 10% 19% 19% 10%	1975
	21st to end	Night	28% 6% 12% 22% 25% 8%	2000
May	1st to 10th	Night	45% 6% 14% 18% 15% 3	4520
	11th to 20th	Night	36% 6% 20% 23% 14% 1	4490
	21st to end	Night	32% 8% 21% 27% 11% 1	4890
June	1st to 10th	Night	34% 10% 18% 25% 12% 2	1800
	11th to 20th	Night	29% 13% 19% 26% 12% 2	1610
	21st to end	Night	36% 12% 21% 21% 9% 1	1758
July	1st to 10th	Night	37% 12% 28% 17% 5%	4035
	11th to 20th	Night	34% 15% 37% 12% 2	4065
	21st to end	Night	43% 15% 18% 21% 3	4785
August	1st to 10th	Night	18% 9% 19% 29% 23% 1	3232
	11th to 20th	Night	27% 13% 23% 28% 8% 1	3230
	21st to end	Night	40% 10% 16% 17% 12% 4	3586
September	1st to 10th	Night	37% 10% 19% 16% 13% 6%	2000
	11th to 20th	Night	34% 10% 16% 18% 15% 8%	2050
	21st to end	Night	31% 6% 11% 24% 17% 11%	2200
October	1st to 10th	Night	27% 4 7% 12% 23% 26%	3705
	11th to 20th	Night	16% 4 5% 20% 25% 31%	3899
	21st to end	Night	20% 3 5% 12% 36% 24%	4252
November	1st to 10th	Night	30% 4 7% 18% 25% 15%	2460
	11th to 20th	Night	30% 5% 7% 16% 27% 16%	2683
	21st to end	Night	37% 4 7% 20% 20% 13%	2730
December	1st to 10th	Night	44% 3 5% 16% 26% 6%	4380
	11th to 20th	Night	40% 4 8% 16% 21% 10%	4954
	21st to end	Night	44% 4 6% 17% 22% 7%	6374

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	25% 19% 36% 16% 4 1	330
	11th to 20th	Day	22% 18% 35% 17% 6%	330
	21st to end	Day	29% 23% 32% 13% 2	363
February	1st to 10th	Day	24% 23% 31% 16% 5% 1	330
	11th to 20th	Day	31% 20% 32% 15% 2	315
	21st to end	Day	22% 27% 37% 13% 1	249
March	1st to 10th	Day	24% 20% 38% 15% 3	300
	11th to 20th	Day	27% 22% 31% 17% 2	300
	21st to end	Day	20% 20% 31% 22% 8%	460
April	1st to 10th	Day	21% 16% 32% 21% 10% 1	500
	11th to 20th	Day	23% 16% 26% 22% 12% 1	492
	21st to end	Day	11% 9% 30% 30% 16% 3	500
May	1st to 10th	Day	15% 12% 26% 27% 17% 3	503
	11th to 20th	Day	13% 7% 24% 31% 18% 8%	527
	21st to end	Day	5% 3 25% 31% 25% 10%	573
June	1st to 10th	Day	13% 2 13% 33% 25% 14%	530
	11th to 20th	Day	7% 3 14% 35% 28% 13%	712
	21st to end	Day	9% 2 15% 26% 30% 18%	730
July	1st to 10th	Day	9% 2 7% 25% 38% 18%	721
	11th to 20th	Day	8% 1 5% 22% 40% 23%	698
	21st to end	Day	11% 2 5% 22% 38% 24%	576
August	1st to 10th	Day	4 1 7% 24% 36% 28%	526
	11th to 20th	Day	9% 6% 18% 37% 30%	519
	21st to end	Day	13% 2 9% 24% 30% 23%	583
September	1st to 10th	Day	12% 2 10% 28% 33% 16%	530
	11th to 20th	Day	11% 4 11% 26% 35% 14%	530
	21st to end	Day	11% 4 13% 32% 32% 9%	530
October	1st to 10th	Day	7% 8% 21% 35% 22% 7%	461
	11th to 20th	Day	8% 9% 24% 33% 22% 5%	330
	21st to end	Day	17% 10% 25% 28% 18% 4	363
November	1st to 10th	Day	15% 9% 28% 31% 15% 2	330
	11th to 20th	Day	15% 15% 29% 28% 12% 1	330
	21st to end	Day	15% 19% 34% 18% 10% 2	330
December	1st to 10th	Day	24% 12% 36% 22% 6% 1	330
	11th to 20th	Day	21% 19% 35% 19% 6% 1	330
	21st to end	Day	24% 17% 29% 21% 8% 1	363
January	1st to 10th	Night	24% 14% 30% 26% 6%	1050
	11th to 20th	Night	22% 14% 30% 27% 7%	1049
	21st to end	Night	25% 15% 32% 25% 3	924
February	1st to 10th	Night	22% 14% 33% 27% 4	840
	11th to 20th	Night	26% 17% 26% 25% 5%	804
	21st to end	Night	23% 20% 34% 21% 3	660
March	1st to 10th	Night	20% 16% 31% 27% 6%	755
	11th to 20th	Night	18% 12% 32% 31% 6% 1	600
	21st to end	Night	18% 11% 32% 29% 10%	660
April	1st to 10th	Night	21% 11% 29% 29% 10% 1	600
	11th to 20th	Night	16% 9% 33% 28% 13%	593
	21st to end	Night	10% 7% 30% 38% 15%	600
May	1st to 10th	Night	12% 6% 26% 39% 17% 1	600
	11th to 20th	Night	9% 4 24% 38% 22% 3	591
	21st to end	Night	7% 2 18% 38% 29% 6%	650
June	1st to 10th	Night	9% 3 10% 36% 37% 6%	600
	11th to 20th	Night	4 3 8% 32% 44% 9%	600
	21st to end	Night	7% 1 9% 29% 38% 16%	600
July	1st to 10th	Night	5% 1 4 21% 51% 18%	585
	11th to 20th	Night	5% 1 5% 17% 47% 25%	582
	21st to end	Night	5% 1 4 23% 47% 19%	657
August	1st to 10th	Night	4 3 20% 49% 24%	597
	11th to 20th	Night	7% 1 5% 16% 47% 23%	594
	21st to end	Night	9% 2 6% 22% 41% 20%	660
September	1st to 10th	Night	9% 2 8% 28% 40% 14%	600
	11th to 20th	Night	11% 3 7% 27% 44% 9%	650
	21st to end	Night	10% 2 13% 32% 37% 7%	800
October	1st to 10th	Night	9% 3 19% 35% 31% 4	800
	11th to 20th	Night	9% 5% 22% 36% 25% 4	800
	21st to end	Night	14% 7% 21% 35% 20% 2	880
November	1st to 10th	Night	14% 6% 21% 36% 20% 2	820
	11th to 20th	Night	15% 9% 27% 34% 15% 1	840
	21st to end	Night	17% 9% 28% 31% 13% 2	840
December	1st to 10th	Night	20% 13% 28% 28% 12%	840
	11th to 20th	Night	21% 9% 32% 28% 9%	840
	21st to end	Night	26% 12% 28% 26% 6%	987

Page generated at 2026-02-13 00:42:18. Version ac07

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