Tuscarora Shale Pit
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tuscarora Shale Pit clear sky chart from 2005-11-06 to 2024-11-11.

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 7% 5% 5% 5% 4 6% 7% 36%	101376
	Night	16% 8% 3 7% 5% 4 4 4 6% 7% 38%	97748
Transparency	Day	44% 5% 12% 23% 14% 2	105015
	Night	43% 4 12% 24% 15% 2	102248
Seeing	Day	24% 16% 27% 20% 10% 3	14860
	Night	21% 15% 25% 26% 11% 1	24306

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	14% 10% 3 9% 6% 5% 4 4 5% 5% 35%	2521
	11th to 20th	Day	12% 14% 5% 12% 8% 6% 5% 4 5% 6% 24%	2840
	21st to end	Day	18% 14% 5% 9% 6% 5% 4 3 5% 5% 27%	3124
February	1st to 10th	Day	15% 13% 3 7% 6% 5% 4 3 6% 6% 32%	1710
	11th to 20th	Day	14% 9% 3 9% 6% 6% 4 4 5% 6% 34%	1668
	21st to end	Day	18% 11% 2 9% 5% 4 4 3 5% 6% 33%	1570
March	1st to 10th	Day	22% 8% 2 7% 5% 5% 5% 4 5% 6% 31%	3395
	11th to 20th	Day	10% 7% 2 8% 6% 5% 6% 4 6% 8% 39%	3480
	21st to end	Day	17% 10% 3 5% 4 4 4 3 4 6% 40%	3864
April	1st to 10th	Day	15% 9% 3 8% 6% 4 5% 3 5% 6% 36%	2280
	11th to 20th	Day	15% 8% 2 8% 5% 4 4 4 5% 6% 38%	2254
	21st to end	Day	19% 7% 2 7% 4 5% 4 4 5% 6% 37%	2313
May	1st to 10th	Day	29% 6% 2 6% 4 4 5% 3 5% 6% 29%	4082
	11th to 20th	Day	25% 7% 3 7% 5% 5% 5% 4 5% 7% 28%	4334
	21st to end	Day	12% 5% 2 5% 4 5% 5% 5% 8% 9% 40%	4823
June	1st to 10th	Day	14% 5% 2 5% 5% 5% 6% 4 7% 9% 38%	2660
	11th to 20th	Day	13% 5% 2 7% 5% 4 5% 4 7% 10% 37%	2660
	21st to end	Day	10% 4 2 6% 5% 5% 5% 5% 7% 11% 41%	2660
July	1st to 10th	Day	6% 5% 2 6% 5% 7% 7% 5% 7% 10% 39%	4440
	11th to 20th	Day	6% 6% 2 6% 5% 6% 6% 5% 8% 10% 40%	4386
	21st to end	Day	11% 8% 3 7% 6% 4 5% 4 6% 7% 38%	4466
August	1st to 10th	Day	18% 6% 2 7% 4 6% 6% 5% 8% 8% 31%	4104
	11th to 20th	Day	12% 5% 2 6% 4 6% 7% 5% 7% 8% 37%	3957
	21st to end	Day	15% 5% 2 5% 4 4 4 3 6% 8% 45%	4180
September	1st to 10th	Day	17% 6% 2 6% 4 4 4 3 5% 6% 44%	2280
	11th to 20th	Day	15% 5% 1 4 4 4 3 4 5% 8% 48%	2280
	21st to end	Day	21% 9% 1 5% 4 4 4 4 5% 6% 38%	1986
October	1st to 10th	Day	17% 7% 2 5% 4 4 4 3 5% 7% 43%	1900
	11th to 20th	Day	17% 6% 1 5% 4 4 5% 4 6% 7% 41%	1900
	21st to end	Day	16% 7% 3 5% 5% 3 4 3 6% 6% 42%	2090
November	1st to 10th	Day	11% 5% 2 6% 3 4 4 3 5% 8% 48%	1835
	11th to 20th	Day	16% 7% 3 6% 5% 4 4 4 6% 8% 39%	1612
	21st to end	Day	16% 7% 2 7% 5% 5% 4 4 7% 7% 36%	1520
December	1st to 10th	Day	19% 8% 3 8% 6% 4 4 5% 7% 6% 29%	1520
	11th to 20th	Day	17% 10% 4 7% 5% 5% 5% 4 6% 7% 33%	1910
	21st to end	Day	19% 9% 4 10% 7% 6% 6% 4 6% 6% 24%	2772
January	1st to 10th	Night	13% 10% 3 10% 6% 5% 4 4 6% 8% 33%	4423
	11th to 20th	Night	16% 9% 4 10% 6% 5% 5% 4 6% 5% 31%	4120
	21st to end	Night	22% 11% 3 8% 5% 5% 4 3 5% 6% 29%	4532
February	1st to 10th	Night	15% 9% 3 7% 5% 4 5% 4 5% 6% 35%	2470
	11th to 20th	Night	15% 9% 3 7% 5% 5% 4 4 6% 7% 36%	2396
	21st to end	Night	16% 9% 3 7% 4 6% 5% 4 5% 6% 34%	1884
March	1st to 10th	Night	21% 9% 2 6% 5% 4 3 3 5% 5% 37%	3457
	11th to 20th	Night	11% 6% 3 8% 4 5% 4 3 5% 7% 44%	3480
	21st to end	Night	14% 8% 3 5% 4 3 4 3 5% 6% 44%	3767
April	1st to 10th	Night	16% 10% 3 8% 6% 4 4 4 5% 7% 33%	1900
	11th to 20th	Night	15% 7% 3 6% 4 4 4 3 6% 7% 41%	1875
	21st to end	Night	17% 6% 2 5% 4 4 4 4 6% 6% 42%	1883
May	1st to 10th	Night	27% 9% 3 6% 4 4 4 3 5% 6% 30%	2813
	11th to 20th	Night	26% 9% 2 5% 5% 4 4 4 6% 6% 30%	2559
	21st to end	Night	12% 6% 2 6% 4 4 5% 5% 7% 10% 38%	2732
June	1st to 10th	Night	12% 7% 2 4 4 4 5% 4 7% 8% 44%	1520
	11th to 20th	Night	12% 6% 3 6% 5% 4 5% 4 7% 8% 41%	1520
	21st to end	Night	10% 5% 2 5% 4 5% 4 4 8% 10% 44%	1520
July	1st to 10th	Night	7% 5% 2 6% 5% 6% 5% 4 8% 9% 42%	2520
	11th to 20th	Night	6% 5% 2 6% 4 5% 6% 5% 8% 11% 41%	2570
	21st to end	Night	12% 8% 2 7% 6% 4 5% 4 6% 6% 41%	3087
August	1st to 10th	Night	18% 6% 2 6% 5% 4 4 4 6% 9% 35%	2825
	11th to 20th	Night	13% 7% 2 6% 5% 4 4 3 6% 7% 42%	2839
	21st to end	Night	16% 4 1 5% 3 5% 4 3 6% 9% 45%	3476
September	1st to 10th	Night	15% 6% 2 5% 4 4 3 3 5% 7% 47%	1900
	11th to 20th	Night	13% 5% 1 4 3 2 3 3 5% 7% 53%	1900
	21st to end	Night	21% 5% 3 6% 3 3 4 3 6% 7% 40%	2190
October	1st to 10th	Night	18% 6% 2 5% 3 4 3 3 5% 6% 45%	2280
	11th to 20th	Night	15% 6% 2 6% 4 4 4 3 5% 6% 46%	2280
	21st to end	Night	17% 6% 2 5% 4 3 5% 3 6% 6% 43%	2508
November	1st to 10th	Night	10% 7% 2 4 4 3 4 3 5% 6% 52%	2461
	11th to 20th	Night	15% 8% 2 6% 5% 4 4 3 6% 7% 41%	2572
	21st to end	Night	14% 6% 2 6% 4 5% 5% 4 6% 8% 39%	2660
December	1st to 10th	Night	16% 9% 4 7% 5% 5% 5% 4 5% 7% 33%	2660
	11th to 20th	Night	17% 8% 2 7% 5% 4 5% 4 5% 6% 35%	3285
	21st to end	Night	17% 9% 3 10% 6% 6% 6% 4 6% 8% 26%	4884

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% 4 12% 22% 8% 3	2522
	11th to 20th	Day	60% 4 9% 14% 10% 2	2840
	21st to end	Day	59% 3 9% 21% 6% 1	3124
February	1st to 10th	Day	53% 3 11% 21% 10% 1	1710
	11th to 20th	Day	50% 5% 10% 23% 11% 1	1677
	21st to end	Day	53% 3 11% 22% 9% 4	1570
March	1st to 10th	Day	53% 4 10% 23% 9% 1	3395
	11th to 20th	Day	40% 6% 11% 26% 14% 3	3480
	21st to end	Day	47% 2 12% 22% 15% 2	3864
April	1st to 10th	Day	49% 3 11% 19% 15% 3	2280
	11th to 20th	Day	46% 4 9% 21% 17% 3	2254
	21st to end	Day	48% 4 7% 23% 15% 3	2313
May	1st to 10th	Day	55% 3 9% 20% 12% 1	4120
	11th to 20th	Day	55% 5% 12% 18% 8% 2	4338
	21st to end	Day	37% 5% 15% 24% 16% 2	4837
June	1st to 10th	Day	41% 5% 12% 25% 15% 1	2660
	11th to 20th	Day	41% 6% 16% 21% 14% 2	2660
	21st to end	Day	36% 6% 12% 30% 14% 1	2660
July	1st to 10th	Day	38% 8% 13% 27% 11% 3	4370
	11th to 20th	Day	36% 7% 17% 25% 15% 1	4311
	21st to end	Day	43% 6% 10% 22% 18% 1	4324
August	1st to 10th	Day	47% 8% 13% 23% 9%	4091
	11th to 20th	Day	40% 8% 11% 27% 14% 1	3996
	21st to end	Day	37% 4 12% 28% 17% 2	4180
September	1st to 10th	Day	41% 4 11% 22% 20% 3	2280
	11th to 20th	Day	35% 4 10% 27% 22% 3	2280
	21st to end	Day	47% 3 9% 18% 20% 2	1986
October	1st to 10th	Day	37% 4 8% 26% 21% 5%	3160
	11th to 20th	Day	31% 6% 13% 26% 19% 5%	3140
	21st to end	Day	28% 3 12% 32% 23% 1	3428
November	1st to 10th	Day	36% 3 14% 23% 20% 4	1835
	11th to 20th	Day	44% 4 9% 23% 17% 3	1612
	21st to end	Day	45% 4 12% 27% 10% 1	1520
December	1st to 10th	Day	53% 4 13% 20% 9% 1	1520
	11th to 20th	Day	50% 3 12% 26% 7% 1	1906
	21st to end	Day	59% 5% 13% 15% 7% 1	2772
January	1st to 10th	Night	49% 4 13% 24% 9% 2	4423
	11th to 20th	Night	52% 6% 12% 19% 9% 2	4120
	21st to end	Night	57% 3 9% 23% 8% 1	4532
February	1st to 10th	Night	49% 4 13% 24% 10% 1	2470
	11th to 20th	Night	48% 4 11% 20% 16% 2	2398
	21st to end	Night	50% 4 10% 20% 12% 3	1884
March	1st to 10th	Night	49% 4 11% 24% 11% 1	3457
	11th to 20th	Night	39% 4 11% 31% 13% 2	3480
	21st to end	Night	41% 3 10% 22% 20% 3	3767
April	1st to 10th	Night	50% 4 9% 19% 15% 3	1900
	11th to 20th	Night	42% 4 10% 23% 18% 4	1875
	21st to end	Night	42% 4 10% 24% 16% 4	1883
May	1st to 10th	Night	56% 3 9% 19% 11% 2	2840
	11th to 20th	Night	55% 5% 12% 17% 10% 1	2560
	21st to end	Night	39% 6% 16% 25% 11% 3	2739
June	1st to 10th	Night	38% 5% 12% 26% 17% 3	1520
	11th to 20th	Night	39% 5% 13% 24% 16% 2	1520
	21st to end	Night	33% 5% 16% 28% 17% 1	1520
July	1st to 10th	Night	36% 7% 17% 19% 15% 6%	2480
	11th to 20th	Night	34% 7% 17% 25% 16% 1	2522
	21st to end	Night	42% 6% 12% 17% 21% 2	2988
August	1st to 10th	Night	45% 6% 15% 24% 9%	2814
	11th to 20th	Night	40% 5% 11% 27% 16% 1	2866
	21st to end	Night	36% 5% 12% 29% 16% 2	3476
September	1st to 10th	Night	38% 4 11% 23% 20% 4	1900
	11th to 20th	Night	32% 3 9% 31% 22% 3	1900
	21st to end	Night	45% 3 10% 21% 19% 2	2190
October	1st to 10th	Night	37% 3 10% 27% 22% 1	3800
	11th to 20th	Night	29% 4 10% 28% 22% 6%	3779
	21st to end	Night	29% 4 10% 31% 23% 3	4120
November	1st to 10th	Night	34% 3 11% 26% 22% 4	2461
	11th to 20th	Night	41% 4 9% 25% 17% 4	2572
	21st to end	Night	42% 4 12% 27% 13% 2	2660
December	1st to 10th	Night	50% 4 13% 22% 10% 1	2660
	11th to 20th	Night	48% 5% 12% 23% 12% 1	3288
	21st to end	Night	55% 4 14% 19% 7% 1	4884

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	37% 24% 27% 8% 2 1	182
	11th to 20th	Day	36% 24% 31% 7% 2	270
	21st to end	Day	33% 30% 26% 8% 2	297
February	1st to 10th	Day	34% 28% 27% 9% 1	270
	11th to 20th	Day	43% 25% 28% 3	275
	21st to end	Day	39% 19% 26% 14% 2	382
March	1st to 10th	Day	34% 20% 27% 16% 3	460
	11th to 20th	Day	34% 24% 25% 12% 5% 1	460
	21st to end	Day	32% 24% 27% 11% 5% 1	506
April	1st to 10th	Day	29% 24% 28% 14% 5%	460
	11th to 20th	Day	26% 21% 26% 15% 8% 3	452
	21st to end	Day	30% 18% 31% 13% 6% 2	460
May	1st to 10th	Day	35% 16% 27% 13% 7% 2	463
	11th to 20th	Day	26% 17% 27% 19% 9% 2	487
	21st to end	Day	19% 12% 27% 23% 14% 5%	529
June	1st to 10th	Day	21% 14% 28% 21% 13% 3	490
	11th to 20th	Day	21% 10% 29% 24% 12% 3	490
	21st to end	Day	13% 13% 34% 26% 12% 2	490
July	1st to 10th	Day	15% 6% 26% 30% 15% 9%	485
	11th to 20th	Day	8% 6% 31% 32% 17% 6%	484
	21st to end	Day	14% 8% 31% 28% 14% 5%	532
August	1st to 10th	Day	15% 7% 22% 32% 18% 7%	486
	11th to 20th	Day	16% 5% 25% 30% 18% 7%	479
	21st to end	Day	15% 7% 25% 28% 16% 8%	539
September	1st to 10th	Day	22% 9% 21% 25% 14% 8%	490
	11th to 20th	Day	17% 4 23% 31% 18% 7%	490
	21st to end	Day	32% 12% 22% 17% 13% 3	490
October	1st to 10th	Day	24% 10% 24% 22% 16% 3	490
	11th to 20th	Day	22% 19% 27% 20% 10% 2	490
	21st to end	Day	21% 19% 35% 16% 8% 1	539
November	1st to 10th	Day	17% 19% 31% 21% 9% 2	433
	11th to 20th	Day	28% 24% 22% 19% 6%	272
	21st to end	Day	26% 24% 38% 8% 4	180
December	1st to 10th	Day	33% 29% 22% 12% 4 1	180
	11th to 20th	Day	32% 24% 30% 11% 2 1	180
	21st to end	Day	31% 26% 24% 16% 4	198
January	1st to 10th	Night	24% 26% 31% 15% 4	760
	11th to 20th	Night	28% 22% 27% 21% 3	760
	21st to end	Night	22% 25% 29% 21% 2	836
February	1st to 10th	Night	23% 23% 27% 26% 2	760
	11th to 20th	Night	29% 29% 26% 15% 1	743
	21st to end	Night	29% 25% 26% 19% 2	628
March	1st to 10th	Night	26% 23% 29% 18% 4	760
	11th to 20th	Night	28% 21% 26% 19% 6% 1	760
	21st to end	Night	25% 21% 29% 19% 5% 1	836
April	1st to 10th	Night	27% 21% 28% 20% 4	760
	11th to 20th	Night	20% 19% 28% 25% 7% 1	751
	21st to end	Night	24% 14% 28% 26% 8%	743
May	1st to 10th	Night	26% 9% 25% 27% 12%	570
	11th to 20th	Night	21% 12% 30% 27% 10%	412
	21st to end	Night	17% 9% 22% 32% 18% 1	411
June	1st to 10th	Night	14% 5% 26% 35% 19% 1	380
	11th to 20th	Night	15% 7% 23% 36% 19% 1	380
	21st to end	Night	12% 4 27% 40% 16%	380
July	1st to 10th	Night	13% 3 22% 38% 21% 3	370
	11th to 20th	Night	9% 3 21% 41% 24% 2	392
	21st to end	Night	12% 4 20% 40% 22% 3	624
August	1st to 10th	Night	13% 1 15% 42% 26% 3	567
	11th to 20th	Night	16% 3 14% 38% 25% 4	592
	21st to end	Night	14% 4 18% 34% 26% 3	836
September	1st to 10th	Night	19% 3 21% 31% 23% 3	760
	11th to 20th	Night	14% 6% 19% 28% 27% 5%	760
	21st to end	Night	25% 7% 19% 27% 20% 2	760
October	1st to 10th	Night	22% 8% 20% 27% 19% 3	760
	11th to 20th	Night	20% 15% 26% 26% 11% 1	760
	21st to end	Night	22% 17% 26% 26% 9%	836
November	1st to 10th	Night	15% 15% 30% 28% 11% 1	780
	11th to 20th	Night	21% 22% 25% 24% 7% 1	763
	21st to end	Night	20% 21% 28% 23% 6%	760
December	1st to 10th	Night	26% 24% 27% 17% 6% 1	760
	11th to 20th	Night	24% 20% 28% 23% 4	760
	21st to end	Night	23% 20% 29% 25% 3	836

Page generated at 2024-11-08 06:44:48. Version ac07

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