Franklinton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Franklinton 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	12% 7% 2 7% 5% 5% 5% 4 6% 8% 39%	100246
	Night	13% 6% 2 6% 4 4 4 4 6% 8% 44%	98816
Transparency	Day	41% 5% 11% 18% 18% 7%	103967
	Night	37% 6% 12% 19% 18% 9%	103235
Seeing	Day	15% 8% 20% 25% 22% 10%	14806
	Night	15% 7% 21% 29% 22% 6%	24462

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 4 4 3 5% 7% 42%	2847
	11th to 20th	Day	13% 6% 2 4 3 3 4 3 4 4 54%	2850
	21st to end	Day	24% 8% 3 5% 3 3 4 3 4 4 38%	3416
February	1st to 10th	Day	17% 10% 4 7% 5% 4 4 4 4 5% 38%	1900
	11th to 20th	Day	18% 7% 2 5% 3 3 4 3 5% 7% 42%	1848
	21st to end	Day	18% 8% 3 8% 4 4 4 4 5% 6% 37%	1570
March	1st to 10th	Day	23% 9% 3 7% 5% 4 4 4 5% 7% 29%	3269
	11th to 20th	Day	16% 7% 3 8% 5% 5% 4 4 6% 8% 34%	3480
	21st to end	Day	13% 8% 3 7% 6% 5% 5% 4 5% 5% 40%	4002
April	1st to 10th	Day	11% 8% 2 6% 5% 5% 5% 4 8% 7% 40%	2280
	11th to 20th	Day	15% 7% 3 6% 5% 5% 5% 3 5% 6% 40%	2254
	21st to end	Day	9% 5% 2 5% 5% 5% 5% 4 6% 7% 46%	2280
May	1st to 10th	Day	12% 6% 2 7% 6% 6% 7% 5% 7% 9% 34%	3765
	11th to 20th	Day	14% 7% 2 6% 5% 4 5% 4 5% 8% 40%	3764
	21st to end	Day	6% 4 2 7% 5% 5% 6% 5% 8% 10% 42%	4129
June	1st to 10th	Day	10% 7% 3 8% 7% 7% 6% 6% 7% 9% 31%	2327
	11th to 20th	Day	5% 6% 2 9% 7% 6% 7% 6% 9% 11% 33%	2528
	21st to end	Day	7% 7% 3 8% 8% 8% 8% 7% 9% 10% 26%	2470
July	1st to 10th	Day	7% 7% 3 9% 8% 8% 9% 7% 9% 11% 23%	4120
	11th to 20th	Day	8% 5% 3 8% 8% 9% 9% 6% 9% 10% 26%	4120
	21st to end	Day	9% 9% 4 10% 8% 7% 8% 5% 8% 11% 23%	4118
August	1st to 10th	Day	3 3 1 5% 5% 4 5% 4 6% 8% 55%	3785
	11th to 20th	Day	6% 4 2 7% 5% 6% 6% 6% 6% 11% 41%	3729
	21st to end	Day	10% 6% 3 8% 6% 6% 7% 5% 6% 7% 35%	4180
September	1st to 10th	Day	11% 7% 3 7% 6% 7% 7% 5% 6% 8% 33%	2280
	11th to 20th	Day	11% 6% 3 6% 5% 5% 6% 5% 7% 7% 38%	2223
	21st to end	Day	8% 5% 2 5% 4 5% 4 4 6% 6% 50%	2090
October	1st to 10th	Day	7% 4 1 5% 4 4 4 4 5% 6% 55%	2003
	11th to 20th	Day	7% 4 2 5% 5% 3 4 3 5% 7% 55%	1900
	21st to end	Day	9% 4 2 4 4 4 3 3 5% 5% 56%	2090
November	1st to 10th	Day	9% 6% 2 5% 4 4 4 3 4 6% 51%	1948
	11th to 20th	Day	11% 5% 2 6% 3 3 3 3 6% 5% 53%	1789
	21st to end	Day	14% 6% 3 6% 3 4 4 3 6% 6% 45%	1710
December	1st to 10th	Day	16% 7% 3 5% 3 5% 4 5% 4 6% 43%	1710
	11th to 20th	Day	16% 10% 3 7% 5% 4 4 2 6% 5% 39%	2153
	21st to end	Day	17% 8% 2 6% 4 4 4 4 6% 7% 38%	3319
January	1st to 10th	Night	18% 7% 2 5% 3 3 3 3 4 5% 47%	4108
	11th to 20th	Night	17% 7% 2 5% 2 3 3 2 4 5% 51%	4120
	21st to end	Night	27% 8% 2 4 3 3 2 2 3 6% 40%	4235
February	1st to 10th	Night	18% 8% 3 5% 4 4 4 2 5% 6% 41%	2280
	11th to 20th	Night	20% 8% 2 6% 4 3 3 3 4 5% 41%	2218
	21st to end	Night	21% 8% 3 7% 4 3 3 3 5% 6% 37%	1884
March	1st to 10th	Night	24% 11% 3 7% 4 4 3 3 4 6% 30%	3612
	11th to 20th	Night	16% 8% 3 7% 5% 5% 5% 4 6% 7% 37%	3480
	21st to end	Night	15% 7% 3 5% 4 4 5% 3 5% 6% 43%	3627
April	1st to 10th	Night	14% 7% 2 6% 4 4 3 3 5% 7% 43%	1900
	11th to 20th	Night	15% 7% 2 5% 4 4 4 3 4 6% 45%	1875
	21st to end	Night	9% 3 2 5% 3 3 3 3 5% 6% 57%	1900
May	1st to 10th	Night	14% 8% 2 6% 4 3 4 3 5% 7% 43%	3130
	11th to 20th	Night	15% 7% 2 7% 4 4 4 4 6% 7% 41%	3129
	21st to end	Night	7% 4 2 5% 4 4 5% 5% 8% 12% 43%	3426
June	1st to 10th	Night	7% 7% 2 7% 5% 4 5% 5% 7% 12% 39%	1812
	11th to 20th	Night	4 4 1 5% 4 4 5% 6% 7% 12% 47%	1619
	21st to end	Night	6% 6% 2 6% 6% 5% 7% 5% 7% 10% 40%	1710
July	1st to 10th	Night	5% 5% 3 7% 6% 6% 7% 6% 11% 14% 30%	2850
	11th to 20th	Night	4 4 2 7% 6% 6% 6% 5% 10% 13% 36%	2850
	21st to end	Night	7% 7% 3 9% 6% 6% 7% 5% 9% 13% 28%	3430
August	1st to 10th	Night	2 2 1 3 3 3 5% 4 7% 11% 57%	3144
	11th to 20th	Night	3 4 2 5% 4 5% 6% 5% 8% 13% 45%	3100
	21st to end	Night	6% 6% 3 7% 5% 5% 6% 6% 7% 10% 40%	3476
September	1st to 10th	Night	8% 6% 3 6% 5% 5% 5% 4 8% 10% 40%	1900
	11th to 20th	Night	10% 5% 2 6% 4 5% 5% 5% 7% 8% 43%	1937
	21st to end	Night	8% 6% 2 6% 3 5% 4 3 5% 7% 51%	2090
October	1st to 10th	Night	8% 4 2 5% 3 4 3 3 5% 7% 58%	2172
	11th to 20th	Night	6% 4 2 5% 3 3 3 3 5% 7% 60%	2280
	21st to end	Night	12% 4 2 4 3 3 3 2 4 5% 58%	2508
November	1st to 10th	Night	11% 4 2 5% 3 3 3 3 4 5% 55%	2335
	11th to 20th	Night	14% 4 1 3 3 3 3 4 6% 5% 54%	2385
	21st to end	Night	14% 7% 2 5% 4 3 4 3 5% 6% 47%	2470
December	1st to 10th	Night	15% 9% 2 6% 4 3 3 3 4 6% 45%	2470
	11th to 20th	Night	15% 9% 3 6% 4 4 4 4 4 6% 41%	3042
	21st to end	Night	19% 9% 3 6% 4 3 3 3 3 5% 41%	4312

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	41% 4 4 17% 25% 9%	2848
	11th to 20th	Day	34% 3 4 18% 30% 10%	2850
	21st to end	Day	50% 3 4 14% 21% 9%	3416
February	1st to 10th	Day	48% 3 7% 13% 18% 10%	1900
	11th to 20th	Day	42% 4 6% 17% 21% 10%	1858
	21st to end	Day	49% 3 8% 14% 17% 10%	1570
March	1st to 10th	Day	54% 4 8% 17% 12% 5%	3269
	11th to 20th	Day	47% 5% 9% 17% 17% 5%	3480
	21st to end	Day	44% 4 9% 13% 21% 8%	4002
April	1st to 10th	Day	41% 5% 9% 17% 18% 9%	2280
	11th to 20th	Day	44% 4 7% 19% 18% 9%	2254
	21st to end	Day	35% 5% 10% 22% 22% 6%	2280
May	1st to 10th	Day	43% 6% 14% 20% 13% 4	3800
	11th to 20th	Day	42% 5% 10% 18% 22% 2	3768
	21st to end	Day	33% 6% 16% 32% 11% 2	4141
June	1st to 10th	Day	47% 7% 12% 22% 10% 1	2327
	11th to 20th	Day	41% 7% 16% 21% 13% 2	2528
	21st to end	Day	48% 9% 15% 19% 7% 1	2470
July	1st to 10th	Day	49% 11% 22% 15% 3	4056
	11th to 20th	Day	46% 11% 29% 10% 2 1	4051
	21st to end	Day	53% 10% 17% 16% 4 1	3987
August	1st to 10th	Day	25% 6% 14% 27% 26% 1	3773
	11th to 20th	Day	35% 8% 18% 26% 11% 1	3765
	21st to end	Day	47% 7% 13% 16% 15% 2	4179
September	1st to 10th	Day	47% 8% 13% 17% 12% 3	2280
	11th to 20th	Day	42% 7% 12% 17% 15% 7%	2223
	21st to end	Day	34% 5% 9% 23% 19% 10%	2090
October	1st to 10th	Day	27% 2 6% 12% 23% 30%	3328
	11th to 20th	Day	18% 2 4 18% 28% 30%	3140
	21st to end	Day	21% 4 4 13% 38% 20%	3428
November	1st to 10th	Day	33% 3 7% 19% 26% 12%	1948
	11th to 20th	Day	32% 3 6% 17% 29% 12%	1789
	21st to end	Day	40% 3 6% 17% 23% 11%	1710
December	1st to 10th	Day	42% 4 9% 18% 20% 8%	1710
	11th to 20th	Day	46% 3 7% 13% 24% 8%	2150
	21st to end	Day	45% 3 9% 18% 22% 3	3319
January	1st to 10th	Night	39% 3 7% 15% 26% 10%	4108
	11th to 20th	Night	36% 3 4 20% 24% 12%	4120
	21st to end	Night	48% 3 4 15% 22% 8%	4235
February	1st to 10th	Night	44% 3 6% 17% 20% 9%	2280
	11th to 20th	Night	46% 4 4 14% 20% 12%	2219
	21st to end	Night	48% 4 8% 14% 14% 12%	1884
March	1st to 10th	Night	56% 4 8% 13% 13% 6%	3612
	11th to 20th	Night	46% 5% 10% 15% 17% 6%	3480
	21st to end	Night	41% 5% 9% 20% 19% 6%	3627
April	1st to 10th	Night	41% 4 10% 17% 17% 11%	1900
	11th to 20th	Night	41% 3 9% 20% 18% 9%	1875
	21st to end	Night	27% 4 11% 23% 27% 8%	1900
May	1st to 10th	Night	39% 5% 14% 21% 16% 4	3160
	11th to 20th	Night	41% 6% 12% 22% 17% 2	3130
	21st to end	Night	29% 7% 21% 28% 12% 2	3435
June	1st to 10th	Night	36% 7% 17% 28% 11% 1	1812
	11th to 20th	Night	27% 10% 19% 29% 13% 2	1619
	21st to end	Night	37% 8% 21% 23% 10% 1	1710
July	1st to 10th	Night	37% 16% 29% 15% 4 1	2805
	11th to 20th	Night	33% 15% 39% 11% 2 1	2796
	21st to end	Night	44% 17% 18% 17% 3	3321
August	1st to 10th	Night	17% 7% 22% 28% 25% 1	3132
	11th to 20th	Night	27% 11% 24% 29% 8% 1	3130
	21st to end	Night	39% 9% 18% 18% 12% 4	3476
September	1st to 10th	Night	37% 8% 21% 17% 12% 6%	1900
	11th to 20th	Night	36% 7% 16% 18% 14% 9%	1937
	21st to end	Night	31% 5% 10% 26% 16% 11%	2090
October	1st to 10th	Night	27% 3 7% 13% 23% 28%	3627
	11th to 20th	Night	16% 2 4 20% 27% 30%	3779
	21st to end	Night	19% 2 5% 12% 36% 25%	4120
November	1st to 10th	Night	31% 3 8% 19% 24% 15%	2335
	11th to 20th	Night	31% 3 7% 16% 27% 16%	2385
	21st to end	Night	38% 3 6% 19% 20% 13%	2470
December	1st to 10th	Night	41% 4 8% 21% 20% 7%	2470
	11th to 20th	Night	45% 3 6% 13% 20% 13%	3044
	21st to end	Night	47% 3 6% 17% 19% 7%	4312

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	27% 15% 35% 18% 4 1	270
	11th to 20th	Day	25% 14% 34% 20% 6%	270
	21st to end	Day	31% 20% 34% 12% 3	297
February	1st to 10th	Day	30% 18% 33% 14% 4	270
	11th to 20th	Day	33% 15% 32% 16% 4	270
	21st to end	Day	24% 27% 36% 11% 2	225
March	1st to 10th	Day	23% 17% 37% 20% 3	270
	11th to 20th	Day	26% 21% 34% 16% 4	270
	21st to end	Day	22% 16% 34% 20% 8%	408
April	1st to 10th	Day	21% 15% 32% 22% 10% 1	460
	11th to 20th	Day	22% 14% 30% 22% 11% 1	452
	21st to end	Day	12% 10% 32% 28% 16% 3	460
May	1st to 10th	Day	14% 10% 29% 27% 17% 4	463
	11th to 20th	Day	15% 4 23% 31% 19% 8%	487
	21st to end	Day	8% 3 18% 35% 26% 11%	529
June	1st to 10th	Day	14% 3 11% 30% 27% 15%	493
	11th to 20th	Day	7% 3 13% 35% 31% 11%	680
	21st to end	Day	10% 3 10% 29% 32% 16%	680
July	1st to 10th	Day	9% 2 6% 25% 39% 19%	671
	11th to 20th	Day	9% 2 3 23% 40% 23%	668
	21st to end	Day	12% 2 3 21% 36% 26%	532
August	1st to 10th	Day	4 2 4 21% 39% 29%	486
	11th to 20th	Day	8% 2 4 17% 38% 30%	479
	21st to end	Day	12% 4 8% 20% 32% 24%	539
September	1st to 10th	Day	12% 2 8% 23% 36% 18%	490
	11th to 20th	Day	11% 5% 11% 24% 34% 15%	490
	21st to end	Day	10% 4 11% 31% 33% 10%	490
October	1st to 10th	Day	8% 5% 22% 36% 22% 6%	403
	11th to 20th	Day	8% 6% 26% 32% 23% 5%	300
	21st to end	Day	17% 9% 19% 32% 19% 3	330
November	1st to 10th	Day	16% 7% 23% 39% 11% 3	297
	11th to 20th	Day	17% 13% 32% 24% 13% 1	270
	21st to end	Day	16% 15% 35% 21% 8% 4	270
December	1st to 10th	Day	22% 9% 36% 21% 10% 1	270
	11th to 20th	Day	23% 16% 39% 16% 6% 1	270
	21st to end	Day	27% 14% 32% 20% 7% 1	297
January	1st to 10th	Night	23% 12% 32% 27% 7%	950
	11th to 20th	Night	23% 11% 31% 26% 8% 1	950
	21st to end	Night	25% 14% 31% 27% 4	865
February	1st to 10th	Night	23% 11% 35% 27% 4	760
	11th to 20th	Night	26% 14% 29% 25% 6%	743
	21st to end	Night	25% 15% 37% 22% 2	628
March	1st to 10th	Night	20% 14% 32% 27% 7%	691
	11th to 20th	Night	19% 9% 32% 31% 9%	570
	21st to end	Night	17% 12% 32% 28% 11%	627
April	1st to 10th	Night	19% 11% 29% 28% 12% 1	570
	11th to 20th	Night	19% 8% 32% 28% 12% 1	563
	21st to end	Night	11% 5% 28% 40% 15%	570
May	1st to 10th	Night	12% 4 27% 38% 18%	570
	11th to 20th	Night	11% 3 22% 38% 24% 3	561
	21st to end	Night	7% 2 17% 37% 30% 7%	617
June	1st to 10th	Night	9% 2 9% 37% 37% 7%	570
	11th to 20th	Night	5% 1 7% 34% 43% 11%	570
	21st to end	Night	8% 2 8% 28% 40% 15%	570
July	1st to 10th	Night	7% 2 4 21% 48% 19%	555
	11th to 20th	Night	4 1 3 18% 49% 25%	552
	21st to end	Night	6% 1 3 21% 47% 20%	624
August	1st to 10th	Night	4 1 2 19% 47% 26%	567
	11th to 20th	Night	7% 1 2 17% 49% 24%	564
	21st to end	Night	10% 2 5% 21% 40% 22%	627
September	1st to 10th	Night	10% 3 7% 23% 41% 16%	570
	11th to 20th	Night	12% 3 8% 25% 42% 11%	607
	21st to end	Night	10% 3 9% 33% 38% 7%	760
October	1st to 10th	Night	9% 3 18% 34% 31% 4	760
	11th to 20th	Night	9% 4 21% 38% 25% 3	760
	21st to end	Night	14% 6% 21% 35% 20% 3	836
November	1st to 10th	Night	14% 7% 21% 37% 19% 2	779
	11th to 20th	Night	16% 7% 28% 33% 14% 1	760
	21st to end	Night	17% 8% 28% 31% 15% 1	760
December	1st to 10th	Night	19% 12% 28% 28% 13%	760
	11th to 20th	Night	23% 7% 32% 29% 9%	760
	21st to end	Night	28% 11% 27% 28% 6%	916

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