Puckett Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Puckett Observatory clear sky chart from 2005-11-06 to 2024-11-10.

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	15% 7% 3 6% 5% 5% 5% 4 6% 7% 38%	101000
	Night	15% 7% 2 6% 4 4 4 4 5% 7% 42%	98114
Transparency	Day	42% 7% 11% 19% 17% 4	104807
	Night	39% 6% 11% 20% 18% 5%	102445
Seeing	Day	20% 12% 24% 21% 15% 7%	14833
	Night	19% 10% 21% 27% 20% 4	24846

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	21% 11% 5% 5% 3 4 3 3 5% 5% 36%	2836
	11th to 20th	Day	20% 7% 4 9% 3 4 3 3 4 4 40%	2840
	21st to end	Day	25% 12% 2 5% 3 2 3 2 3 4 37%	3229
February	1st to 10th	Day	21% 11% 3 6% 5% 3 3 3 5% 5% 36%	1900
	11th to 20th	Day	24% 8% 2 6% 3 4 4 3 5% 5% 35%	1848
	21st to end	Day	26% 8% 3 6% 4 3 3 2 5% 4 36%	1570
March	1st to 10th	Day	26% 9% 3 5% 3 4 3 3 5% 6% 34%	3180
	11th to 20th	Day	15% 6% 2 5% 4 3 4 2 4 6% 48%	3480
	21st to end	Day	18% 9% 2 7% 5% 4 4 3 5% 7% 38%	3815
April	1st to 10th	Day	14% 7% 2 5% 5% 5% 4 4 5% 7% 41%	2182
	11th to 20th	Day	14% 7% 3 6% 4 5% 4 3 5% 6% 43%	2254
	21st to end	Day	13% 6% 2 6% 5% 4 5% 4 5% 8% 42%	2431
May	1st to 10th	Day	17% 6% 3 7% 4 4 4 4 6% 7% 38%	4082
	11th to 20th	Day	20% 7% 2 7% 5% 4 5% 4 6% 8% 31%	4081
	21st to end	Day	11% 6% 2 7% 4 5% 5% 5% 7% 9% 39%	4476
June	1st to 10th	Day	13% 6% 2 8% 5% 6% 6% 5% 8% 8% 33%	2470
	11th to 20th	Day	7% 4 2 6% 6% 6% 6% 6% 9% 10% 38%	2470
	21st to end	Day	8% 5% 2 7% 7% 6% 6% 5% 9% 11% 35%	2470
July	1st to 10th	Day	8% 6% 3 7% 6% 6% 7% 7% 9% 12% 28%	4120
	11th to 20th	Day	10% 6% 2 7% 6% 7% 7% 6% 8% 12% 30%	4120
	21st to end	Day	14% 10% 4 11% 7% 8% 7% 6% 8% 8% 17%	4466
August	1st to 10th	Day	6% 3 2 6% 6% 5% 7% 6% 10% 12% 38%	4104
	11th to 20th	Day	9% 5% 2 6% 4 6% 6% 6% 8% 12% 38%	3795
	21st to end	Day	8% 4 2 6% 5% 6% 6% 5% 7% 8% 43%	4180
September	1st to 10th	Day	11% 6% 3 7% 6% 6% 6% 4 7% 9% 35%	2119
	11th to 20th	Day	14% 7% 2 7% 5% 4 5% 4 7% 7% 37%	2090
	21st to end	Day	14% 5% 2 6% 4 4 5% 4 5% 7% 44%	2090
October	1st to 10th	Day	11% 5% 1 5% 4 4 4 3 4 6% 53%	2090
	11th to 20th	Day	12% 5% 2 5% 3 3 3 3 4 6% 54%	1990
	21st to end	Day	13% 6% 2 4 2 3 3 3 5% 5% 53%	2062
November	1st to 10th	Day	13% 5% 2 4 3 3 3 3 5% 5% 54%	1753
	11th to 20th	Day	15% 6% 1 4 3 3 3 3 4 6% 50%	1710
	21st to end	Day	17% 8% 3 5% 3 3 4 3 4 6% 43%	1710
December	1st to 10th	Day	25% 9% 2 6% 3 4 5% 3 5% 4 35%	1710
	11th to 20th	Day	18% 8% 3 6% 4 4 4 3 5% 5% 40%	2153
	21st to end	Day	21% 10% 6% 6% 4 3 3 3 5% 6% 33%	3124
January	1st to 10th	Night	20% 13% 3 4 4 3 3 3 4 5% 38%	4109
	11th to 20th	Night	21% 9% 3 5% 3 3 3 3 4 5% 41%	4120
	21st to end	Night	24% 13% 3 5% 3 3 3 2 3 4 36%	4422
February	1st to 10th	Night	18% 8% 3 6% 4 4 4 3 5% 6% 40%	2280
	11th to 20th	Night	23% 8% 2 6% 4 4 4 3 5% 4 37%	2218
	21st to end	Night	24% 9% 3 6% 4 3 5% 3 4 5% 34%	1884
March	1st to 10th	Night	22% 9% 3 7% 4 4 4 3 4 6% 33%	3672
	11th to 20th	Night	13% 5% 2 5% 3 3 5% 4 6% 7% 47%	3480
	21st to end	Night	16% 9% 2 6% 5% 3 3 3 4 6% 41%	3817
April	1st to 10th	Night	14% 4 1 4 4 4 5% 4 5% 8% 46%	2012
	11th to 20th	Night	14% 7% 2 4 4 3 3 3 5% 7% 47%	1875
	21st to end	Night	11% 6% 2 5% 4 4 4 3 5% 8% 48%	1748
May	1st to 10th	Night	16% 7% 2 7% 4 4 4 4 5% 7% 39%	2813
	11th to 20th	Night	20% 6% 2 6% 4 4 4 4 6% 8% 36%	2812
	21st to end	Night	7% 6% 2 5% 4 5% 5% 4 8% 11% 42%	3079
June	1st to 10th	Night	9% 6% 3 7% 6% 6% 6% 4 8% 11% 35%	1710
	11th to 20th	Night	5% 5% 1 4 4 4 5% 5% 9% 13% 45%	1710
	21st to end	Night	7% 5% 2 5% 6% 5% 6% 4 8% 10% 44%	1710
July	1st to 10th	Night	10% 7% 2 7% 6% 6% 6% 5% 7% 11% 33%	2840
	11th to 20th	Night	8% 5% 2 6% 4 5% 5% 5% 8% 11% 41%	2840
	21st to end	Night	15% 10% 3 9% 6% 6% 6% 6% 8% 9% 23%	3087
August	1st to 10th	Night	6% 4 2 6% 5% 4 5% 5% 8% 12% 44%	2825
	11th to 20th	Night	8% 6% 3 6% 4 5% 4 4 6% 8% 47%	3030
	21st to end	Night	7% 5% 2 5% 4 4 4 3 6% 9% 51%	3476
September	1st to 10th	Night	8% 5% 3 6% 6% 5% 5% 5% 7% 9% 41%	2040
	11th to 20th	Night	10% 7% 2 6% 4 4 5% 4 6% 8% 44%	2090
	21st to end	Night	12% 4 2 5% 4 4 4 3 5% 6% 51%	2090
October	1st to 10th	Night	10% 4 2 4 3 4 3 3 4 6% 57%	2090
	11th to 20th	Night	13% 5% 2 5% 3 3 3 2 3 5% 55%	2189
	21st to end	Night	13% 6% 1 5% 3 3 3 3 4 5% 55%	2532
November	1st to 10th	Night	13% 5% 2 5% 3 2 3 2 4 6% 54%	2530
	11th to 20th	Night	13% 7% 2 5% 3 3 3 3 4 6% 51%	2470
	21st to end	Night	17% 7% 2 5% 4 3 4 3 5% 6% 44%	2470
December	1st to 10th	Night	23% 8% 3 5% 4 3 4 4 5% 7% 34%	2470
	11th to 20th	Night	17% 10% 3 6% 3 3 4 3 4 5% 43%	3042
	21st to end	Night	21% 10% 4 7% 4 4 4 3 5% 7% 30%	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	51% 3 6% 14% 23% 3	2837
	11th to 20th	Day	48% 4 7% 15% 22% 3	2840
	21st to end	Day	51% 3 7% 16% 19% 4	3229
February	1st to 10th	Day	50% 4 6% 17% 19% 3	1900
	11th to 20th	Day	51% 4 6% 16% 17% 5%	1858
	21st to end	Day	52% 4 6% 13% 19% 6%	1570
March	1st to 10th	Day	50% 5% 8% 14% 14% 9%	3180
	11th to 20th	Day	39% 5% 7% 20% 22% 8%	3480
	21st to end	Day	47% 4 8% 20% 17% 3	3815
April	1st to 10th	Day	41% 7% 11% 18% 18% 4	2182
	11th to 20th	Day	41% 5% 8% 17% 24% 6%	2254
	21st to end	Day	39% 7% 11% 27% 14% 3	2431
May	1st to 10th	Day	44% 8% 11% 21% 14% 2	4120
	11th to 20th	Day	50% 8% 11% 23% 9% 1	4085
	21st to end	Day	38% 9% 12% 22% 17% 1	4489
June	1st to 10th	Day	45% 10% 15% 19% 9% 1	2470
	11th to 20th	Day	36% 12% 16% 23% 11% 2	2470
	21st to end	Day	38% 12% 17% 19% 12% 2	2470
July	1st to 10th	Day	42% 14% 20% 17% 6% 1	4055
	11th to 20th	Day	43% 13% 21% 16% 5% 2	4051
	21st to end	Day	61% 12% 12% 10% 4	4324
August	1st to 10th	Day	32% 12% 17% 29% 9%	4091
	11th to 20th	Day	34% 11% 19% 21% 13% 1	3833
	21st to end	Day	35% 10% 12% 26% 15% 2	4179
September	1st to 10th	Day	42% 11% 12% 16% 16% 4	2119
	11th to 20th	Day	42% 8% 13% 17% 18% 1	2090
	21st to end	Day	39% 7% 12% 15% 21% 6%	2090
October	1st to 10th	Day	25% 6% 6% 15% 37% 11%	3480
	11th to 20th	Day	22% 4 5% 18% 28% 23%	3282
	21st to end	Day	26% 5% 6% 25% 25% 12%	3376
November	1st to 10th	Day	32% 5% 7% 16% 30% 10%	1753
	11th to 20th	Day	36% 3 7% 19% 25% 10%	1710
	21st to end	Day	42% 5% 6% 17% 25% 6%	1710
December	1st to 10th	Day	52% 5% 6% 17% 16% 4	1710
	11th to 20th	Day	46% 3 7% 15% 23% 6%	2150
	21st to end	Day	52% 3 9% 19% 15% 2	3124
January	1st to 10th	Night	49% 3 5% 15% 24% 4	4109
	11th to 20th	Night	46% 4 8% 18% 16% 8%	4120
	21st to end	Night	54% 2 5% 12% 21% 4	4422
February	1st to 10th	Night	45% 4 8% 17% 21% 5%	2280
	11th to 20th	Night	51% 4 6% 15% 18% 6%	2219
	21st to end	Night	53% 3 8% 14% 16% 6%	1884
March	1st to 10th	Night	52% 5% 10% 12% 15% 5%	3672
	11th to 20th	Night	35% 5% 9% 21% 21% 9%	3480
	21st to end	Night	44% 4 8% 22% 18% 4	3817
April	1st to 10th	Night	35% 6% 12% 20% 22% 5%	2012
	11th to 20th	Night	37% 4 9% 21% 21% 8%	1875
	21st to end	Night	36% 5% 11% 28% 18% 2	1748
May	1st to 10th	Night	43% 8% 14% 20% 14% 1	2840
	11th to 20th	Night	46% 7% 14% 22% 10%	2813
	21st to end	Night	31% 12% 16% 25% 15% 1	3087
June	1st to 10th	Night	41% 10% 16% 20% 11% 2	1710
	11th to 20th	Night	26% 12% 22% 26% 12% 1	1710
	21st to end	Night	33% 12% 18% 20% 13% 4	1710
July	1st to 10th	Night	40% 13% 20% 20% 6%	2795
	11th to 20th	Night	33% 12% 24% 22% 6% 2	2786
	21st to end	Night	54% 13% 13% 14% 5% 1	2988
August	1st to 10th	Night	29% 11% 18% 32% 9%	2814
	11th to 20th	Night	32% 8% 18% 27% 15%	3058
	21st to end	Night	28% 9% 15% 27% 20% 2	3476
September	1st to 10th	Night	37% 11% 14% 18% 15% 5%	2040
	11th to 20th	Night	36% 11% 14% 20% 18% 1	2090
	21st to end	Night	33% 7% 12% 21% 20% 7%	2090
October	1st to 10th	Night	20% 5% 9% 17% 35% 13%	3480
	11th to 20th	Night	20% 3 6% 17% 34% 20%	3636
	21st to end	Night	22% 4 5% 28% 28% 13%	4168
November	1st to 10th	Night	32% 5% 9% 20% 24% 10%	2530
	11th to 20th	Night	35% 3 6% 19% 25% 11%	2470
	21st to end	Night	42% 5% 6% 19% 24% 5%	2470
December	1st to 10th	Night	49% 5% 9% 16% 16% 5%	2470
	11th to 20th	Night	44% 4 8% 14% 25% 5%	3044
	21st to end	Night	53% 4 8% 20% 13% 2	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	36% 23% 33% 8% 1	270
	11th to 20th	Day	39% 21% 27% 10% 3	270
	21st to end	Day	29% 32% 28% 8% 2	297
February	1st to 10th	Day	37% 22% 32% 9% 1	270
	11th to 20th	Day	49% 21% 24% 5% 1	270
	21st to end	Day	48% 24% 22% 5%	225
March	1st to 10th	Day	34% 19% 31% 13% 3	304
	11th to 20th	Day	30% 21% 27% 16% 5% 1	460
	21st to end	Day	27% 22% 29% 15% 6%	506
April	1st to 10th	Day	28% 15% 27% 19% 10% 2	460
	11th to 20th	Day	20% 19% 29% 21% 9% 1	452
	21st to end	Day	22% 13% 32% 18% 12% 3	460
May	1st to 10th	Day	21% 13% 31% 19% 11% 5%	463
	11th to 20th	Day	16% 10% 27% 25% 14% 8%	487
	21st to end	Day	13% 9% 23% 27% 17% 11%	529
June	1st to 10th	Day	16% 7% 22% 26% 19% 11%	490
	11th to 20th	Day	9% 5% 18% 30% 25% 14%	490
	21st to end	Day	10% 6% 24% 27% 20% 14%	490
July	1st to 10th	Day	11% 4 12% 28% 26% 18%	485
	11th to 20th	Day	11% 5% 12% 27% 26% 20%	484
	21st to end	Day	11% 5% 10% 27% 28% 20%	532
August	1st to 10th	Day	11% 4 18% 23% 24% 20%	486
	11th to 20th	Day	13% 4 19% 27% 24% 14%	479
	21st to end	Day	15% 4 12% 21% 32% 16%	539
September	1st to 10th	Day	10% 2 21% 28% 28% 12%	490
	11th to 20th	Day	16% 6% 16% 26% 28% 8%	490
	21st to end	Day	17% 6% 18% 30% 24% 5%	490
October	1st to 10th	Day	15% 7% 25% 30% 17% 7%	490
	11th to 20th	Day	19% 11% 26% 27% 16% 2	490
	21st to end	Day	18% 12% 28% 26% 14% 2	511
November	1st to 10th	Day	21% 16% 32% 23% 7% 2	297
	11th to 20th	Day	25% 20% 33% 19% 3	270
	21st to end	Day	23% 22% 35% 14% 5% 1	270
December	1st to 10th	Day	35% 23% 24% 17% 1 1	270
	11th to 20th	Day	30% 19% 32% 14% 4	270
	21st to end	Day	33% 22% 33% 10% 2	297
January	1st to 10th	Night	31% 19% 27% 19% 4	760
	11th to 20th	Night	29% 17% 24% 23% 7%	760
	21st to end	Night	26% 18% 29% 25% 2	836
February	1st to 10th	Night	26% 14% 27% 28% 5%	760
	11th to 20th	Night	31% 19% 27% 20% 2	743
	21st to end	Night	33% 18% 28% 18% 3	628
March	1st to 10th	Night	23% 18% 29% 25% 5%	760
	11th to 20th	Night	23% 17% 27% 25% 7% 1	760
	21st to end	Night	23% 16% 28% 25% 9%	836
April	1st to 10th	Night	18% 15% 26% 29% 11% 1	682
	11th to 20th	Night	18% 15% 27% 26% 12% 1	563
	21st to end	Night	16% 9% 26% 33% 15% 1	570
May	1st to 10th	Night	14% 9% 25% 31% 19% 2	570
	11th to 20th	Night	14% 7% 21% 32% 21% 5%	561
	21st to end	Night	12% 2 15% 32% 32% 7%	617
June	1st to 10th	Night	11% 2 14% 36% 32% 5%	570
	11th to 20th	Night	7% 2 11% 30% 39% 11%	570
	21st to end	Night	8% 2 9% 31% 41% 9%	570
July	1st to 10th	Night	11% 2 8% 22% 46% 10%	555
	11th to 20th	Night	9% 1 8% 25% 42% 14%	552
	21st to end	Night	11% 2 6% 23% 49% 9%	624
August	1st to 10th	Night	8% 2 7% 27% 43% 13%	567
	11th to 20th	Night	9% 2 13% 27% 40% 9%	564
	21st to end	Night	13% 1 11% 23% 42% 10%	627
September	1st to 10th	Night	10% 2 13% 27% 40% 8%	710
	11th to 20th	Night	13% 3 15% 31% 34% 4	760
	21st to end	Night	13% 4 16% 34% 31% 3	760
October	1st to 10th	Night	11% 7% 21% 32% 22% 7%	760
	11th to 20th	Night	14% 9% 27% 28% 20% 1	760
	21st to end	Night	17% 10% 20% 34% 16% 3	836
November	1st to 10th	Night	17% 8% 25% 29% 18% 3	779
	11th to 20th	Night	18% 16% 23% 28% 13% 2	760
	21st to end	Night	22% 14% 27% 25% 12% 1	760
December	1st to 10th	Night	29% 17% 22% 25% 7% 1	760
	11th to 20th	Night	25% 14% 25% 27% 8% 1	760
	21st to end	Night	31% 13% 25% 25% 6%	836

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