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 2024-11-30.

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 7% 5% 5% 5% 4 6% 8% 39%	100650
	Night	13% 6% 2 6% 4 4 4 4 6% 8% 44%	98891
Transparency	Day	40% 7% 11% 17% 17% 7%	104385
	Night	36% 7% 12% 18% 18% 9%	103295
Seeing	Day	14% 9% 20% 25% 22% 10%	14863
	Night	15% 8% 22% 29% 22% 5%	24527

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% 7% 2 6% 3 3 4 3 6% 6% 42%	2847
	11th to 20th	Day	13% 6% 2 4 3 4 3 2 4 5% 54%	2850
	21st to end	Day	25% 9% 2 5% 3 3 3 3 4 5% 39%	3456
February	1st to 10th	Day	17% 10% 3 7% 5% 4 4 3 5% 5% 38%	1900
	11th to 20th	Day	19% 7% 3 5% 4 3 3 3 5% 7% 42%	1848
	21st to end	Day	18% 8% 3 7% 4 5% 4 3 5% 6% 38%	1570
March	1st to 10th	Day	25% 10% 3 7% 5% 4 4 3 5% 6% 28%	3216
	11th to 20th	Day	17% 8% 3 7% 5% 5% 4 3 6% 8% 35%	3480
	21st to end	Day	13% 7% 3 8% 5% 5% 5% 4 5% 5% 40%	4027
April	1st to 10th	Day	13% 6% 3 6% 5% 4 6% 4 5% 8% 41%	2280
	11th to 20th	Day	16% 6% 3 6% 3 4 4 4 6% 7% 40%	2254
	21st to end	Day	8% 6% 2 6% 5% 4 5% 5% 6% 8% 46%	2280
May	1st to 10th	Day	12% 6% 2 7% 5% 6% 6% 5% 7% 9% 35%	3765
	11th to 20th	Day	15% 7% 2 7% 5% 4 5% 4 5% 7% 40%	3764
	21st to end	Day	7% 5% 2 6% 6% 5% 6% 5% 8% 11% 41%	4146
June	1st to 10th	Day	10% 6% 3 7% 6% 7% 6% 5% 9% 9% 31%	2470
	11th to 20th	Day	6% 5% 2 7% 7% 7% 7% 6% 8% 11% 34%	2643
	21st to end	Day	7% 7% 2 8% 7% 8% 7% 7% 9% 11% 27%	2498
July	1st to 10th	Day	7% 7% 3 9% 8% 8% 8% 7% 9% 11% 23%	4120
	11th to 20th	Day	8% 6% 3 8% 8% 8% 9% 7% 8% 10% 27%	4088
	21st to end	Day	10% 7% 3 11% 7% 7% 7% 6% 8% 11% 23%	4118
August	1st to 10th	Day	3 3 2 5% 5% 4 5% 4 6% 9% 55%	3785
	11th to 20th	Day	7% 4 2 7% 5% 5% 6% 5% 7% 10% 42%	3729
	21st to end	Day	10% 6% 3 8% 7% 6% 7% 5% 7% 8% 35%	4180
September	1st to 10th	Day	12% 7% 2 8% 6% 7% 6% 4 6% 8% 34%	2280
	11th to 20th	Day	11% 6% 2 8% 6% 5% 4 4 5% 7% 40%	2211
	21st to end	Day	9% 5% 2 5% 5% 4 5% 3 4 7% 51%	2090
October	1st to 10th	Day	7% 5% 2 5% 3 4 4 4 6% 5% 55%	2025
	11th to 20th	Day	8% 4 1 5% 4 3 4 3 5% 7% 55%	1900
	21st to end	Day	9% 5% 1 4 4 3 3 3 4 6% 56%	2090
November	1st to 10th	Day	10% 5% 2 6% 5% 4 4 3 5% 7% 50%	1958
	11th to 20th	Day	11% 6% 2 4 3 4 4 3 5% 6% 54%	1840
	21st to end	Day	14% 7% 3 5% 4 4 3 3 5% 6% 46%	1797
December	1st to 10th	Day	15% 6% 3 6% 5% 4 4 4 5% 5% 43%	1710
	11th to 20th	Day	15% 10% 4 7% 4 4 3 3 5% 5% 40%	2153
	21st to end	Day	16% 8% 2 6% 4 4 4 5% 6% 7% 39%	3282
January	1st to 10th	Night	19% 7% 2 4 3 3 3 3 4 6% 47%	4108
	11th to 20th	Night	17% 7% 2 4 3 3 3 3 3 5% 51%	4120
	21st to end	Night	28% 9% 2 4 3 3 2 2 3 5% 41%	4180
February	1st to 10th	Night	18% 7% 3 5% 4 4 4 3 5% 6% 40%	2280
	11th to 20th	Night	21% 8% 3 5% 4 4 3 2 4 6% 41%	2218
	21st to end	Night	20% 9% 2 5% 4 4 4 3 5% 5% 37%	1884
March	1st to 10th	Night	24% 11% 3 7% 4 4 3 3 5% 6% 30%	3651
	11th to 20th	Night	15% 8% 2 7% 5% 5% 5% 3 6% 7% 37%	3480
	21st to end	Night	16% 7% 2 5% 4 4 4 4 5% 6% 43%	3601
April	1st to 10th	Night	15% 7% 2 5% 5% 4 3 3 4 7% 44%	1900
	11th to 20th	Night	15% 5% 2 6% 5% 4 5% 3 5% 6% 44%	1875
	21st to end	Night	8% 4 2 5% 3 3 3 3 6% 6% 57%	1900
May	1st to 10th	Night	15% 7% 2 6% 4 4 3 3 5% 7% 44%	3130
	11th to 20th	Night	15% 6% 3 7% 4 4 3 3 6% 7% 43%	3129
	21st to end	Night	6% 4 2 6% 4 5% 5% 5% 8% 12% 43%	3400
June	1st to 10th	Night	9% 5% 2 7% 6% 4 4 5% 8% 11% 40%	1710
	11th to 20th	Night	3 5% 2 5% 5% 5% 5% 6% 8% 9% 48%	1530
	21st to end	Night	6% 5% 2 6% 5% 6% 7% 5% 6% 11% 40%	1670
July	1st to 10th	Night	6% 6% 3 8% 6% 6% 7% 6% 10% 13% 31%	2850
	11th to 20th	Night	5% 5% 2 6% 5% 6% 6% 7% 10% 14% 34%	2876
	21st to end	Night	7% 7% 3 9% 7% 7% 7% 6% 7% 12% 28%	3435
August	1st to 10th	Night	2 2 1 3 3 3 4 4 8% 12% 57%	3144
	11th to 20th	Night	4 3 1 5% 4 5% 7% 4 9% 13% 45%	3100
	21st to end	Night	6% 6% 3 8% 5% 6% 5% 5% 7% 8% 39%	3476
September	1st to 10th	Night	8% 5% 2 7% 5% 6% 5% 4 8% 8% 40%	1900
	11th to 20th	Night	10% 5% 2 6% 5% 5% 5% 4 7% 9% 43%	1947
	21st to end	Night	9% 4 1 6% 4 5% 4 3 5% 7% 53%	2090
October	1st to 10th	Night	8% 3 2 5% 3 4 3 3 5% 6% 59%	2150
	11th to 20th	Night	8% 4 2 4 3 3 3 3 6% 5% 60%	2280
	21st to end	Night	12% 4 2 5% 3 3 3 3 4 4 59%	2508
November	1st to 10th	Night	12% 5% 1 4 3 3 3 3 4 5% 56%	2340
	11th to 20th	Night	14% 5% 1 3 3 3 4 3 5% 5% 54%	2555
	21st to end	Night	14% 7% 2 5% 3 4 3 3 5% 6% 47%	2599
December	1st to 10th	Night	16% 8% 2 6% 4 3 3 3 5% 6% 45%	2470
	11th to 20th	Night	16% 8% 2 7% 4 4 4 3 5% 5% 42%	3042
	21st to end	Night	18% 9% 3 7% 4 4 3 3 4 5% 41%	4363

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	40% 5% 6% 16% 25% 9%	2848
	11th to 20th	Day	33% 5% 5% 18% 30% 10%	2850
	21st to end	Day	49% 3 5% 14% 21% 9%	3456
February	1st to 10th	Day	48% 4 7% 14% 17% 10%	1900
	11th to 20th	Day	43% 4 6% 16% 21% 10%	1858
	21st to end	Day	47% 6% 8% 14% 17% 9%	1570
March	1st to 10th	Day	54% 6% 8% 14% 13% 5%	3216
	11th to 20th	Day	46% 7% 8% 17% 17% 5%	3480
	21st to end	Day	44% 7% 9% 13% 19% 8%	4027
April	1st to 10th	Day	41% 7% 9% 16% 18% 9%	2280
	11th to 20th	Day	42% 6% 8% 17% 18% 8%	2254
	21st to end	Day	34% 7% 11% 20% 23% 5%	2280
May	1st to 10th	Day	40% 11% 13% 18% 14% 4	3800
	11th to 20th	Day	42% 6% 11% 19% 21% 2	3768
	21st to end	Day	33% 9% 16% 30% 10% 2	4159
June	1st to 10th	Day	44% 11% 14% 20% 8% 2	2470
	11th to 20th	Day	40% 10% 17% 18% 13% 2	2643
	21st to end	Day	47% 13% 15% 18% 7% 1	2498
July	1st to 10th	Day	51% 12% 20% 14% 3	4056
	11th to 20th	Day	47% 11% 28% 11% 2	4019
	21st to end	Day	52% 11% 16% 15% 5% 1	3987
August	1st to 10th	Day	25% 8% 13% 28% 25% 1	3773
	11th to 20th	Day	36% 8% 17% 26% 12% 1	3765
	21st to end	Day	45% 9% 14% 15% 15% 2	4179
September	1st to 10th	Day	45% 11% 13% 15% 12% 5%	2280
	11th to 20th	Day	42% 8% 11% 17% 16% 7%	2211
	21st to end	Day	33% 6% 10% 22% 19% 10%	2090
October	1st to 10th	Day	26% 4 6% 11% 23% 29%	3363
	11th to 20th	Day	18% 3 6% 16% 28% 30%	3140
	21st to end	Day	22% 3 4 13% 36% 21%	3428
November	1st to 10th	Day	34% 4 7% 17% 25% 12%	1958
	11th to 20th	Day	32% 5% 6% 15% 30% 13%	1840
	21st to end	Day	39% 4 7% 17% 22% 11%	1797
December	1st to 10th	Day	41% 6% 9% 18% 19% 8%	1710
	11th to 20th	Day	46% 5% 6% 12% 24% 8%	2150
	21st to end	Day	42% 6% 9% 17% 21% 3	3282
January	1st to 10th	Night	38% 5% 7% 14% 27% 9%	4108
	11th to 20th	Night	35% 5% 5% 19% 24% 12%	4120
	21st to end	Night	48% 3 4 14% 23% 8%	4180
February	1st to 10th	Night	44% 4 7% 16% 19% 9%	2280
	11th to 20th	Night	46% 4 5% 13% 20% 12%	2219
	21st to end	Night	47% 6% 9% 14% 13% 12%	1884
March	1st to 10th	Night	53% 6% 9% 12% 13% 6%	3651
	11th to 20th	Night	44% 9% 9% 14% 18% 6%	3480
	21st to end	Night	39% 7% 10% 20% 19% 6%	3601
April	1st to 10th	Night	40% 5% 10% 17% 18% 11%	1900
	11th to 20th	Night	40% 5% 10% 20% 17% 9%	1875
	21st to end	Night	27% 6% 12% 21% 26% 8%	1900
May	1st to 10th	Night	38% 7% 14% 21% 16% 4	3160
	11th to 20th	Night	39% 7% 14% 23% 16% 2	3130
	21st to end	Night	28% 10% 21% 27% 13% 2	3408
June	1st to 10th	Night	34% 11% 18% 25% 11% 2	1710
	11th to 20th	Night	28% 13% 18% 27% 13% 2	1530
	21st to end	Night	35% 12% 20% 22% 10% 1	1670
July	1st to 10th	Night	40% 14% 28% 14% 4 1	2805
	11th to 20th	Night	35% 15% 36% 11% 2 1	2822
	21st to end	Night	46% 17% 18% 16% 3	3325
August	1st to 10th	Night	17% 9% 19% 29% 24% 1	3132
	11th to 20th	Night	27% 13% 22% 29% 8% 1	3130
	21st to end	Night	40% 10% 16% 18% 12% 4	3476
September	1st to 10th	Night	38% 10% 19% 15% 13% 6%	1900
	11th to 20th	Night	35% 10% 16% 17% 14% 8%	1947
	21st to end	Night	31% 7% 11% 24% 16% 11%	2090
October	1st to 10th	Night	27% 4 7% 12% 24% 27%	3592
	11th to 20th	Night	16% 4 5% 20% 25% 31%	3779
	21st to end	Night	19% 3 5% 11% 36% 25%	4120
November	1st to 10th	Night	31% 4 8% 18% 24% 15%	2340
	11th to 20th	Night	31% 5% 7% 15% 27% 16%	2555
	21st to end	Night	38% 4 6% 20% 20% 13%	2599
December	1st to 10th	Night	40% 5% 7% 21% 20% 7%	2470
	11th to 20th	Night	44% 4 6% 12% 21% 12%	3044
	21st to end	Night	46% 5% 7% 17% 19% 6%	4363

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% 18% 35% 17% 4 1	270
	11th to 20th	Day	23% 16% 34% 19% 7%	270
	21st to end	Day	27% 25% 33% 13% 2	297
February	1st to 10th	Day	27% 26% 26% 16% 4 1	270
	11th to 20th	Day	31% 18% 31% 16% 2	270
	21st to end	Day	23% 28% 36% 12% 1	225
March	1st to 10th	Day	24% 19% 37% 17% 3	270
	11th to 20th	Day	26% 22% 31% 18% 2	270
	21st to end	Day	19% 19% 32% 22% 8%	420
April	1st to 10th	Day	20% 17% 31% 22% 10% 1	460
	11th to 20th	Day	23% 15% 25% 22% 13% 1	452
	21st to end	Day	11% 10% 30% 30% 16% 3	460
May	1st to 10th	Day	13% 12% 26% 27% 18% 4	463
	11th to 20th	Day	13% 6% 22% 32% 19% 8%	487
	21st to end	Day	5% 3 23% 31% 27% 11%	529
June	1st to 10th	Day	14% 2 12% 32% 26% 14%	490
	11th to 20th	Day	7% 2 14% 35% 28% 13%	663
	21st to end	Day	9% 2 15% 26% 29% 18%	680
July	1st to 10th	Day	10% 2 6% 24% 38% 19%	671
	11th to 20th	Day	8% 1 5% 22% 40% 24%	649
	21st to end	Day	11% 2 4 21% 37% 24%	532
August	1st to 10th	Day	4 1 8% 23% 36% 29%	486
	11th to 20th	Day	9% 6% 18% 37% 29%	479
	21st to end	Day	13% 2 9% 22% 31% 23%	539
September	1st to 10th	Day	12% 2 9% 26% 34% 17%	490
	11th to 20th	Day	11% 4 12% 26% 33% 13%	490
	21st to end	Day	11% 4 12% 30% 33% 10%	490
October	1st to 10th	Day	7% 8% 21% 34% 23% 7%	425
	11th to 20th	Day	8% 8% 24% 33% 21% 5%	300
	21st to end	Day	17% 10% 22% 29% 19% 4	330
November	1st to 10th	Day	15% 8% 29% 33% 14% 1	300
	11th to 20th	Day	16% 16% 29% 27% 11% 1	300
	21st to end	Day	15% 19% 33% 19% 11% 3	299
December	1st to 10th	Day	21% 11% 35% 24% 7% 1	270
	11th to 20th	Day	24% 20% 33% 18% 5%	270
	21st to end	Day	25% 18% 29% 21% 6% 1	297
January	1st to 10th	Night	23% 14% 30% 27% 6%	950
	11th to 20th	Night	22% 13% 31% 27% 7%	950
	21st to end	Night	24% 15% 32% 25% 4	836
February	1st to 10th	Night	22% 14% 33% 27% 4	760
	11th to 20th	Night	25% 17% 27% 25% 6%	743
	21st to end	Night	23% 20% 34% 20% 2	628
March	1st to 10th	Night	20% 15% 31% 28% 7%	717
	11th to 20th	Night	18% 11% 33% 32% 6% 1	570
	21st to end	Night	18% 11% 32% 29% 10%	627
April	1st to 10th	Night	20% 10% 30% 29% 10% 1	570
	11th to 20th	Night	16% 10% 32% 29% 13%	563
	21st to end	Night	10% 7% 31% 38% 14%	570
May	1st to 10th	Night	10% 6% 26% 39% 18% 1	570
	11th to 20th	Night	9% 4 22% 39% 23% 3	561
	21st to end	Night	6% 2 17% 38% 30% 6%	617
June	1st to 10th	Night	9% 3 9% 36% 37% 6%	570
	11th to 20th	Night	4 2 8% 33% 44% 9%	570
	21st to end	Night	7% 1 9% 29% 37% 16%	570
July	1st to 10th	Night	5% 1 5% 21% 50% 19%	555
	11th to 20th	Night	5% 1 5% 17% 47% 25%	552
	21st to end	Night	5% 1 5% 23% 46% 20%	624
August	1st to 10th	Night	4 3 20% 48% 24%	567
	11th to 20th	Night	7% 1 5% 17% 47% 23%	564
	21st to end	Night	9% 2 6% 22% 41% 20%	627
September	1st to 10th	Night	9% 2 7% 27% 40% 14%	570
	11th to 20th	Night	11% 3 7% 27% 42% 9%	617
	21st to end	Night	10% 2 13% 31% 38% 6%	760
October	1st to 10th	Night	9% 2 19% 35% 32% 4	760
	11th to 20th	Night	9% 5% 23% 35% 25% 4	760
	21st to end	Night	14% 7% 22% 35% 21% 2	836
November	1st to 10th	Night	14% 6% 22% 36% 20% 2	780
	11th to 20th	Night	15% 9% 27% 33% 15% 1	800
	21st to end	Night	18% 9% 27% 31% 14% 2	800
December	1st to 10th	Night	18% 14% 28% 27% 13%	760
	11th to 20th	Night	22% 9% 33% 28% 9%	760
	21st to end	Night	27% 13% 29% 26% 6%	893

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