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 2024-11-04.

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	13% 6% 2 6% 4 4 4 4 6% 8% 42%	100656
	Night	14% 6% 2 6% 4 4 4 3 5% 7% 44%	98284
Transparency	Day	39% 5% 12% 21% 17% 5%	104304
	Night	39% 5% 10% 20% 19% 6%	102776
Seeing	Day	18% 11% 26% 24% 16% 5%	15293
	Night	17% 10% 26% 30% 15% 2	25423

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	18% 6% 2 4 3 3 2 2 3 5% 52%	2836
	11th to 20th	Day	14% 7% 2 5% 4 3 3 3 4 5% 50%	2840
	21st to end	Day	19% 10% 2 5% 4 4 3 2 4 5% 41%	3124
February	1st to 10th	Day	13% 7% 2 6% 4 3 4 3 6% 8% 43%	1710
	11th to 20th	Day	21% 7% 2 4 4 3 4 3 4 5% 45%	1696
	21st to end	Day	18% 8% 3 6% 5% 3 4 2 5% 5% 41%	1674
March	1st to 10th	Day	23% 9% 3 6% 3 3 4 3 5% 7% 35%	3435
	11th to 20th	Day	11% 4 2 4 3 3 3 3 5% 7% 53%	3480
	21st to end	Day	20% 6% 2 6% 4 4 4 3 4 6% 42%	3815
April	1st to 10th	Day	11% 5% 1 4 3 3 4 3 5% 6% 54%	2232
	11th to 20th	Day	11% 5% 2 5% 4 4 3 4 6% 8% 48%	2254
	21st to end	Day	14% 7% 1 5% 4 4 4 4 5% 6% 45%	2280
May	1st to 10th	Day	11% 6% 3 8% 6% 6% 6% 4 8% 10% 32%	4005
	11th to 20th	Day	17% 7% 3 8% 5% 5% 5% 5% 6% 8% 33%	4081
	21st to end	Day	8% 4 2 5% 5% 4 5% 5% 6% 9% 48%	4476
June	1st to 10th	Day	10% 5% 3 6% 5% 5% 6% 4 7% 9% 41%	2539
	11th to 20th	Day	8% 5% 1 6% 4 4 4 5% 7% 9% 45%	2621
	21st to end	Day	8% 5% 2 5% 6% 6% 6% 5% 8% 11% 38%	2470
July	1st to 10th	Day	6% 4 2 7% 6% 7% 7% 6% 9% 11% 35%	4120
	11th to 20th	Day	11% 6% 3 7% 6% 6% 6% 5% 8% 11% 32%	4120
	21st to end	Day	10% 7% 3 9% 6% 6% 6% 5% 8% 11% 28%	4466
August	1st to 10th	Day	18% 8% 3 9% 5% 5% 5% 5% 8% 9% 23%	4104
	11th to 20th	Day	8% 6% 2 7% 6% 5% 6% 5% 7% 11% 37%	3885
	21st to end	Day	7% 4 2 5% 4 4 5% 4 7% 10% 48%	4180
September	1st to 10th	Day	9% 5% 3 6% 4 5% 5% 4 6% 8% 45%	2280
	11th to 20th	Day	16% 6% 2 6% 5% 4 4 4 6% 7% 41%	2195
	21st to end	Day	21% 7% 3 5% 3 3 4 4 5% 7% 38%	2026
October	1st to 10th	Day	16% 5% 2 6% 4 3 3 3 4 7% 48%	1900
	11th to 20th	Day	13% 5% 1 4 3 3 3 3 4 5% 56%	1900
	21st to end	Day	11% 4 2 5% 4 3 3 2 4 5% 57%	2090
November	1st to 10th	Day	13% 6% 1 5% 3 4 3 2 3 6% 54%	1887
	11th to 20th	Day	15% 5% 2 4 3 3 3 3 6% 5% 52%	1881
	21st to end	Day	14% 5% 2 4 3 3 2 4 5% 7% 51%	1534
December	1st to 10th	Day	18% 8% 2 5% 4 3 4 3 5% 6% 42%	1520
	11th to 20th	Day	15% 5% 2 5% 2 2 3 2 4 6% 55%	1910
	21st to end	Day	17% 6% 2 6% 3 3 4 4 5% 7% 43%	3090
January	1st to 10th	Night	15% 6% 2 5% 4 4 4 3 5% 6% 46%	4109
	11th to 20th	Night	15% 8% 3 6% 4 3 3 3 4 6% 46%	4120
	21st to end	Night	19% 7% 2 5% 4 4 3 3 4 4 45%	4532
February	1st to 10th	Night	17% 7% 2 5% 3 3 4 3 5% 6% 44%	2470
	11th to 20th	Night	20% 6% 2 6% 4 3 4 3 5% 5% 42%	2369
	21st to end	Night	15% 6% 2 4 4 4 4 4 6% 5% 46%	1775
March	1st to 10th	Night	23% 10% 3 7% 4 3 4 3 4 4 34%	3418
	11th to 20th	Night	13% 6% 2 5% 3 3 3 2 4 5% 52%	3480
	21st to end	Night	17% 5% 2 4 3 3 3 2 4 6% 50%	3817
April	1st to 10th	Night	14% 6% 2 5% 3 4 3 4 5% 6% 49%	1948
	11th to 20th	Night	13% 5% 1 5% 4 3 3 3 6% 7% 49%	1875
	21st to end	Night	12% 4 2 6% 5% 5% 4 4 5% 7% 46%	1900
May	1st to 10th	Night	12% 7% 3 8% 5% 4 4 3 6% 8% 39%	2917
	11th to 20th	Night	20% 8% 3 8% 5% 4 4 3 4 5% 36%	2812
	21st to end	Night	8% 5% 2 6% 3 4 4 4 6% 10% 48%	3079
June	1st to 10th	Night	11% 6% 2 6% 5% 5% 5% 5% 7% 11% 39%	1625
	11th to 20th	Night	9% 6% 2 6% 5% 4 5% 5% 6% 10% 41%	1541
	21st to end	Night	8% 6% 2 5% 5% 5% 5% 5% 8% 10% 40%	1710
July	1st to 10th	Night	7% 5% 3 8% 5% 5% 7% 4 9% 12% 36%	2840
	11th to 20th	Night	15% 6% 2 7% 5% 5% 5% 5% 7% 10% 34%	2840
	21st to end	Night	14% 9% 4 9% 6% 5% 5% 5% 6% 8% 28%	3087
August	1st to 10th	Night	21% 7% 3 8% 6% 5% 5% 5% 7% 9% 24%	2825
	11th to 20th	Night	8% 6% 3 7% 5% 6% 6% 5% 9% 10% 37%	2910
	21st to end	Night	6% 5% 2 6% 4 4 5% 4 7% 11% 47%	3476
September	1st to 10th	Night	11% 6% 2 5% 4 4 5% 4 5% 8% 47%	1900
	11th to 20th	Night	14% 7% 2 7% 4 4 4 3 5% 6% 43%	1981
	21st to end	Night	21% 7% 3 8% 4 4 4 3 5% 5% 36%	2152
October	1st to 10th	Night	14% 6% 2 6% 4 4 4 3 5% 6% 48%	2280
	11th to 20th	Night	13% 6% 3 4 3 3 3 3 4 4 54%	2280
	21st to end	Night	11% 5% 2 5% 3 3 3 3 4 5% 56%	2508
November	1st to 10th	Night	13% 6% 2 6% 4 3 3 2 5% 5% 52%	2264
	11th to 20th	Night	13% 5% 2 5% 4 3 4 3 6% 6% 49%	2294
	21st to end	Night	13% 5% 2 5% 4 3 3 3 6% 6% 51%	2645
December	1st to 10th	Night	17% 7% 3 7% 4 4 4 3 4 5% 42%	2660
	11th to 20th	Night	17% 6% 2 5% 2 3 3 4 5% 5% 48%	3285
	21st to end	Night	17% 6% 2 5% 3 3 3 3 4 6% 46%	4560

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	37% 2 6% 26% 24% 5%	2837
	11th to 20th	Day	37% 3 6% 18% 30% 5%	2840
	21st to end	Day	46% 4 7% 18% 19% 6%	3124
February	1st to 10th	Day	39% 4 11% 22% 19% 5%	1710
	11th to 20th	Day	42% 5% 6% 19% 22% 6%	1705
	21st to end	Day	45% 4 11% 15% 19% 6%	1674
March	1st to 10th	Day	49% 5% 8% 18% 13% 8%	3435
	11th to 20th	Day	30% 5% 8% 19% 24% 13%	3480
	21st to end	Day	44% 4 9% 20% 19% 4	3815
April	1st to 10th	Day	30% 4 10% 24% 22% 9%	2232
	11th to 20th	Day	33% 5% 12% 22% 21% 7%	2254
	21st to end	Day	39% 5% 11% 23% 18% 5%	2280
May	1st to 10th	Day	44% 9% 16% 18% 11% 2	4042
	11th to 20th	Day	47% 6% 12% 23% 10% 1	4085
	21st to end	Day	30% 8% 16% 23% 20% 3	4489
June	1st to 10th	Day	38% 8% 14% 23% 15% 2	2539
	11th to 20th	Day	33% 8% 17% 25% 16% 2	2621
	21st to end	Day	37% 9% 15% 22% 15% 2	2470
July	1st to 10th	Day	39% 8% 19% 19% 11% 3	4055
	11th to 20th	Day	45% 7% 25% 18% 6% 1	4051
	21st to end	Day	48% 9% 15% 17% 11%	4324
August	1st to 10th	Day	54% 6% 19% 16% 5%	4091
	11th to 20th	Day	40% 7% 20% 24% 9% 1	3924
	21st to end	Day	31% 6% 14% 33% 14% 2	4180
September	1st to 10th	Day	36% 8% 14% 18% 20% 4	2280
	11th to 20th	Day	41% 5% 11% 20% 20% 3	2195
	21st to end	Day	45% 5% 10% 19% 16% 4	2026
October	1st to 10th	Day	36% 2 8% 21% 26% 8%	3160
	11th to 20th	Day	21% 3 5% 21% 28% 22%	3140
	21st to end	Day	24% 2 7% 26% 25% 15%	3428
November	1st to 10th	Day	34% 3 7% 23% 27% 6%	1887
	11th to 20th	Day	34% 3 9% 22% 25% 7%	1881
	21st to end	Day	34% 3 9% 23% 26% 6%	1534
December	1st to 10th	Day	42% 6% 10% 19% 18% 4	1520
	11th to 20th	Day	33% 3 7% 27% 22% 8%	1906
	21st to end	Day	41% 4 10% 24% 19% 2	3090
January	1st to 10th	Night	38% 4 8% 20% 26% 5%	4109
	11th to 20th	Night	41% 3 7% 18% 25% 5%	4120
	21st to end	Night	44% 4 5% 19% 22% 7%	4532
February	1st to 10th	Night	40% 4 9% 21% 20% 5%	2470
	11th to 20th	Night	44% 4 8% 16% 21% 7%	2371
	21st to end	Night	39% 5% 9% 20% 20% 7%	1775
March	1st to 10th	Night	53% 4 8% 15% 16% 5%	3418
	11th to 20th	Night	35% 4 7% 15% 24% 16%	3480
	21st to end	Night	36% 4 8% 24% 22% 5%	3817
April	1st to 10th	Night	36% 5% 9% 18% 25% 7%	1948
	11th to 20th	Night	34% 5% 9% 23% 22% 7%	1875
	21st to end	Night	36% 5% 10% 26% 18% 5%	1900
May	1st to 10th	Night	42% 7% 14% 21% 13% 2	2946
	11th to 20th	Night	49% 7% 10% 19% 14% 1	2813
	21st to end	Night	29% 8% 17% 24% 20% 2	3087
June	1st to 10th	Night	37% 9% 16% 20% 16% 1	1625
	11th to 20th	Night	37% 9% 16% 20% 16% 2	1541
	21st to end	Night	36% 11% 14% 21% 16% 3	1710
July	1st to 10th	Night	39% 11% 19% 19% 11% 2	2795
	11th to 20th	Night	45% 9% 23% 17% 5% 1	2786
	21st to end	Night	53% 9% 12% 17% 10%	2988
August	1st to 10th	Night	54% 7% 18% 16% 5% 1	2814
	11th to 20th	Night	40% 6% 20% 25% 7% 1	2937
	21st to end	Night	32% 6% 11% 29% 21% 2	3476
September	1st to 10th	Night	35% 9% 13% 21% 17% 5%	1900
	11th to 20th	Night	41% 6% 11% 19% 20% 3	1981
	21st to end	Night	49% 6% 11% 14% 16% 4	2152
October	1st to 10th	Night	39% 3 7% 21% 25% 5%	3800
	11th to 20th	Night	25% 3 6% 19% 27% 20%	3779
	21st to end	Night	23% 2 6% 30% 23% 16%	4120
November	1st to 10th	Night	36% 3 8% 20% 27% 7%	2264
	11th to 20th	Night	35% 4 8% 17% 24% 11%	2294
	21st to end	Night	34% 4 7% 22% 27% 6%	2645
December	1st to 10th	Night	45% 4 9% 19% 19% 4	2660
	11th to 20th	Night	38% 3 8% 21% 22% 8%	3288
	21st to end	Night	39% 3 8% 25% 23% 3	4560

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% 26% 36% 11% 3	270
	11th to 20th	Day	27% 27% 33% 10% 3	270
	21st to end	Day	21% 25% 41% 11% 2	297
February	1st to 10th	Day	20% 24% 40% 13% 3	270
	11th to 20th	Day	39% 23% 29% 9% 1	303
	21st to end	Day	26% 21% 33% 16% 4	382
March	1st to 10th	Day	24% 22% 32% 17% 6%	460
	11th to 20th	Day	23% 22% 37% 13% 5%	460
	21st to end	Day	23% 19% 37% 15% 5% 1	506
April	1st to 10th	Day	22% 18% 36% 17% 6%	460
	11th to 20th	Day	17% 17% 34% 21% 8% 3	452
	21st to end	Day	19% 12% 32% 25% 11% 1	460
May	1st to 10th	Day	17% 17% 33% 22% 9% 2	463
	11th to 20th	Day	18% 8% 26% 28% 17% 3	487
	21st to end	Day	17% 5% 25% 26% 22% 6%	529
June	1st to 10th	Day	11% 6% 26% 34% 18% 6%	490
	11th to 20th	Day	11% 4 23% 30% 25% 7%	490
	21st to end	Day	9% 4 21% 38% 24% 5%	490
July	1st to 10th	Day	11% 1 12% 34% 31% 11%	485
	11th to 20th	Day	7% 2 11% 34% 37% 9%	484
	21st to end	Day	10% 2 18% 36% 27% 7%	532
August	1st to 10th	Day	14% 3 21% 30% 22% 9%	486
	11th to 20th	Day	12% 2 14% 31% 29% 12%	479
	21st to end	Day	10% 3 12% 32% 26% 17%	539
September	1st to 10th	Day	12% 4 15% 28% 27% 14%	490
	11th to 20th	Day	18% 5% 14% 30% 22% 11%	490
	21st to end	Day	27% 6% 23% 26% 13% 4	490
October	1st to 10th	Day	20% 6% 22% 23% 21% 8%	490
	11th to 20th	Day	14% 12% 28% 26% 17% 4	490
	21st to end	Day	15% 12% 25% 27% 16% 4	539
November	1st to 10th	Day	19% 10% 30% 24% 14% 3	467
	11th to 20th	Day	18% 16% 29% 24% 10% 2	451
	21st to end	Day	20% 18% 26% 22% 13% 2	194
December	1st to 10th	Day	24% 19% 40% 11% 6%	180
	11th to 20th	Day	21% 16% 34% 23% 4 2	180
	21st to end	Day	25% 19% 32% 14% 9% 1	288
January	1st to 10th	Night	21% 20% 31% 24% 4 1	760
	11th to 20th	Night	21% 16% 34% 23% 6%	760
	21st to end	Night	20% 17% 36% 25% 4	836
February	1st to 10th	Night	20% 16% 36% 23% 4	760
	11th to 20th	Night	24% 23% 36% 16% 1	743
	21st to end	Night	20% 17% 37% 25% 2	628
March	1st to 10th	Night	20% 15% 34% 26% 5%	760
	11th to 20th	Night	20% 18% 34% 20% 8%	760
	21st to end	Night	19% 14% 40% 21% 5%	836
April	1st to 10th	Night	18% 18% 33% 25% 6%	760
	11th to 20th	Night	16% 12% 36% 26% 10%	751
	21st to end	Night	14% 10% 38% 30% 7%	760
May	1st to 10th	Night	11% 13% 35% 33% 7%	637
	11th to 20th	Night	18% 7% 26% 34% 15% 1	561
	21st to end	Night	14% 2 18% 39% 25% 2	617
June	1st to 10th	Night	12% 2 21% 41% 22% 1	485
	11th to 20th	Night	11% 3 18% 40% 23% 4	401
	21st to end	Night	8% 3 15% 44% 27% 3	570
July	1st to 10th	Night	9% 1 12% 41% 33% 3	555
	11th to 20th	Night	9% 1 9% 39% 36% 6%	552
	21st to end	Night	11% 2 15% 39% 30% 4	624
August	1st to 10th	Night	13% 3 11% 40% 31% 3	567
	11th to 20th	Night	13% 3 11% 37% 33% 4	637
	21st to end	Night	11% 2 11% 34% 36% 6%	836
September	1st to 10th	Night	14% 2 11% 36% 33% 5%	760
	11th to 20th	Night	17% 4 14% 34% 29% 4	760
	21st to end	Night	24% 4 19% 31% 20% 1	760
October	1st to 10th	Night	18% 5% 19% 28% 25% 5%	760
	11th to 20th	Night	16% 10% 25% 28% 19% 2	760
	21st to end	Night	14% 11% 24% 31% 19% 2	836
November	1st to 10th	Night	16% 8% 28% 31% 14% 2	755
	11th to 20th	Night	16% 12% 29% 31% 11%	760
	21st to end	Night	15% 14% 27% 29% 14% 1	760
December	1st to 10th	Night	22% 14% 29% 28% 8%	760
	11th to 20th	Night	19% 11% 32% 31% 7%	760
	21st to end	Night	22% 17% 26% 28% 7%	836

Page generated at 2024-11-01 22:47:33. Version ac07

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