Kittanning
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kittanning clear sky chart from 2005-11-06 to 2024-01-14.

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	17% 10% 4 7% 6% 3 5% 5% 5% 7% 30%	74638
	Night	17% 10% 4 7% 6% 3 4 4 5% 7% 32%	75126
Transparency	Day	52% 7% 12% 18% 9% 1	74353
	Night	51% 7% 12% 18% 10% 2	74930
Seeing	Day	25% 15% 27% 19% 11% 4	13563
	Night	23% 12% 27% 26% 11% 1	23289

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% 18% 9% 11% 7% 3 3 3 4 5% 20%	1640
	11th to 20th	Day	19% 20% 7% 11% 8% 3 3 3 3 4 17%	1647
	21st to end	Day	18% 17% 9% 13% 8% 3 5% 4 4 5% 15%	1782
February	1st to 10th	Day	21% 18% 6% 10% 8% 4 5% 3 3 4 18%	1620
	11th to 20th	Day	18% 14% 8% 11% 6% 3 6% 4 4 5% 20%	1573
	21st to end	Day	21% 13% 6% 9% 7% 4 4 3 4 6% 23%	1466
March	1st to 10th	Day	16% 11% 6% 8% 6% 3 5% 4 4 6% 31%	1980
	11th to 20th	Day	19% 12% 5% 7% 5% 3 5% 4 4 6% 28%	1980
	21st to end	Day	21% 11% 4 8% 6% 4 5% 4 4 6% 27%	2178
April	1st to 10th	Day	16% 12% 4 6% 6% 4 4 4 6% 6% 31%	2101
	11th to 20th	Day	19% 10% 4 6% 6% 4 5% 4 5% 6% 32%	2136
	21st to end	Day	23% 9% 3 6% 6% 3 4 4 4 6% 33%	2340
May	1st to 10th	Day	20% 9% 3 7% 5% 3 5% 5% 6% 6% 30%	2340
	11th to 20th	Day	21% 8% 3 6% 6% 4 5% 5% 5% 7% 30%	2314
	21st to end	Day	13% 6% 2 5% 6% 3 5% 6% 7% 9% 38%	2725
June	1st to 10th	Day	15% 7% 3 6% 6% 5% 6% 5% 6% 9% 34%	2520
	11th to 20th	Day	14% 8% 3 6% 5% 3 6% 5% 7% 9% 33%	2520
	21st to end	Day	15% 6% 3 6% 5% 3 5% 5% 6% 10% 36%	2520
July	1st to 10th	Day	12% 7% 3 5% 6% 3 6% 5% 5% 8% 39%	2520
	11th to 20th	Day	12% 7% 2 6% 5% 4 6% 5% 7% 9% 37%	2348
	21st to end	Day	12% 6% 3 7% 6% 3 7% 7% 6% 9% 33%	2547
August	1st to 10th	Day	11% 6% 2 6% 7% 6% 7% 7% 7% 10% 32%	2327
	11th to 20th	Day	14% 7% 3 6% 6% 4 6% 6% 5% 10% 33%	2303
	21st to end	Day	13% 6% 2 5% 5% 4 6% 5% 7% 9% 37%	2435
September	1st to 10th	Day	18% 6% 2 6% 5% 3 4 4 4 7% 41%	2160
	11th to 20th	Day	13% 5% 3 5% 5% 3 4 5% 6% 9% 43%	2028
	21st to end	Day	19% 7% 3 5% 5% 3 4 4 5% 7% 37%	1955
October	1st to 10th	Day	17% 8% 3 6% 5% 3 5% 5% 6% 8% 36%	1800
	11th to 20th	Day	22% 8% 4 6% 4 3 5% 5% 5% 6% 33%	1800
	21st to end	Day	26% 10% 3 5% 5% 3 5% 4 4 7% 29%	1980
November	1st to 10th	Day	13% 8% 3 7% 5% 3 4 4 5% 8% 40%	1805
	11th to 20th	Day	18% 14% 3 6% 5% 3 4 4 5% 6% 31%	1526
	21st to end	Day	19% 16% 4 7% 5% 4 5% 5% 5% 5% 24%	1520
December	1st to 10th	Day	21% 18% 9% 10% 6% 3 4 4 4 4 17%	1520
	11th to 20th	Day	19% 19% 8% 11% 4 2 4 4 3 5% 21%	1910
	21st to end	Day	27% 21% 8% 9% 6% 3 3 2 3 4 15%	2772
January	1st to 10th	Night	20% 16% 8% 9% 7% 3 5% 5% 4 5% 20%	2522
	11th to 20th	Night	21% 16% 6% 11% 7% 4 4 4 4 4 18%	2391
	21st to end	Night	19% 16% 7% 9% 7% 4 4 4 4 5% 21%	2574
February	1st to 10th	Night	21% 14% 5% 11% 7% 4 4 4 4 4 23%	2340
	11th to 20th	Night	19% 12% 5% 12% 6% 4 5% 4 4 5% 23%	2273
	21st to end	Night	21% 13% 5% 9% 7% 3 4 4 4 6% 24%	1784
March	1st to 10th	Night	18% 10% 5% 7% 6% 3 5% 5% 4 7% 31%	1980
	11th to 20th	Night	21% 10% 4 6% 4 2 3 4 5% 6% 34%	1980
	21st to end	Night	18% 11% 4 7% 5% 3 4 3 4 6% 34%	2178
April	1st to 10th	Night	19% 11% 4 6% 4 3 5% 4 4 6% 34%	1859
	11th to 20th	Night	16% 7% 3 7% 4 3 5% 5% 5% 6% 38%	1775
	21st to end	Night	17% 8% 3 6% 6% 3 5% 4 5% 8% 35%	1634
May	1st to 10th	Night	19% 8% 3 6% 5% 4 4 5% 6% 6% 34%	1620
	11th to 20th	Night	18% 7% 2 6% 6% 3 4 5% 5% 8% 37%	1575
	21st to end	Night	10% 6% 2 4 5% 3 4 5% 6% 11% 44%	1550
June	1st to 10th	Night	10% 6% 2 6% 5% 2 5% 5% 5% 8% 44%	1440
	11th to 20th	Night	12% 6% 3 6% 5% 3 5% 5% 5% 10% 41%	1440
	21st to end	Night	11% 5% 2 4 5% 3 5% 6% 7% 10% 41%	1440
July	1st to 10th	Night	9% 7% 2 6% 6% 3 5% 4 5% 9% 45%	1440
	11th to 20th	Night	11% 4 2 5% 4 3 5% 5% 6% 10% 44%	1608
	21st to end	Night	11% 5% 2 6% 6% 3 5% 6% 7% 10% 38%	1771
August	1st to 10th	Night	8% 5% 2 6% 5% 3 5% 6% 7% 9% 45%	1611
	11th to 20th	Night	11% 6% 2 6% 5% 3 5% 4 5% 9% 44%	1598
	21st to end	Night	12% 4 2 5% 5% 3 5% 5% 6% 9% 44%	1903
September	1st to 10th	Night	13% 6% 2 5% 4 3 3 5% 5% 7% 47%	1800
	11th to 20th	Night	10% 4 2 4 4 2 4 4 5% 9% 51%	1930
	21st to end	Night	16% 8% 3 6% 5% 3 3 4 5% 6% 41%	2004
October	1st to 10th	Night	15% 6% 2 5% 5% 3 4 6% 4 6% 43%	2160
	11th to 20th	Night	19% 8% 3 4 6% 3 4 4 5% 7% 38%	2160
	21st to end	Night	25% 9% 3 6% 4 3 4 3 4 7% 32%	2376
November	1st to 10th	Night	14% 9% 3 5% 5% 3 4 4 4 6% 42%	2270
	11th to 20th	Night	19% 11% 5% 6% 6% 3 5% 4 5% 7% 30%	2651
	21st to end	Night	19% 13% 5% 6% 5% 3 4 4 5% 6% 29%	2660
December	1st to 10th	Night	22% 17% 8% 8% 6% 3 4 4 4 5% 18%	2660
	11th to 20th	Night	20% 16% 7% 10% 6% 3 4 4 4 5% 22%	3285
	21st to end	Night	25% 18% 7% 8% 7% 3 4 4 4 5% 14%	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	70% 4 10% 11% 5%	1641
	11th to 20th	Day	72% 4 11% 10% 3	1647
	21st to end	Day	73% 5% 9% 9% 4 1	1782
February	1st to 10th	Day	72% 4 8% 11% 5%	1620
	11th to 20th	Day	67% 5% 11% 12% 5%	1582
	21st to end	Day	63% 5% 10% 14% 7% 1	1466
March	1st to 10th	Day	54% 6% 12% 19% 8%	1980
	11th to 20th	Day	58% 5% 10% 16% 9% 2	1980
	21st to end	Day	58% 6% 8% 17% 10% 2	2178
April	1st to 10th	Day	52% 7% 11% 17% 11% 2	2101
	11th to 20th	Day	51% 7% 10% 16% 14% 2	2136
	21st to end	Day	52% 6% 11% 19% 11% 2	2340
May	1st to 10th	Day	52% 9% 11% 17% 8% 2	2340
	11th to 20th	Day	54% 8% 10% 15% 11% 2	2318
	21st to end	Day	40% 10% 18% 21% 9% 2	2725
June	1st to 10th	Day	46% 10% 12% 20% 11% 1	2520
	11th to 20th	Day	45% 9% 14% 19% 12% 1	2520
	21st to end	Day	43% 9% 12% 26% 10% 1	2520
July	1st to 10th	Day	44% 9% 11% 20% 13% 3	2450
	11th to 20th	Day	41% 9% 14% 24% 12% 1	2278
	21st to end	Day	43% 11% 13% 19% 13% 1	2405
August	1st to 10th	Day	43% 11% 16% 23% 7%	2314
	11th to 20th	Day	44% 9% 15% 21% 10% 1	2303
	21st to end	Day	40% 10% 13% 22% 12% 3	2435
September	1st to 10th	Day	42% 7% 10% 21% 16% 3	2160
	11th to 20th	Day	37% 7% 16% 25% 14% 1	2028
	21st to end	Day	46% 8% 11% 21% 14% 1	1955
October	1st to 10th	Day	45% 8% 14% 19% 14% 1	1800
	11th to 20th	Day	50% 7% 12% 22% 8%	1800
	21st to end	Day	55% 6% 12% 16% 9% 1	1980
November	1st to 10th	Day	43% 7% 14% 18% 16% 2	1805
	11th to 20th	Day	54% 7% 11% 18% 8% 2	1526
	21st to end	Day	61% 7% 12% 15% 5% 1	1520
December	1st to 10th	Day	72% 5% 9% 10% 3	1520
	11th to 20th	Day	67% 5% 11% 14% 3	1906
	21st to end	Day	76% 4 9% 9% 2	2772
January	1st to 10th	Night	67% 5% 10% 14% 4 1	2522
	11th to 20th	Night	69% 7% 11% 11% 3	2391
	21st to end	Night	66% 6% 10% 12% 5% 1	2574
February	1st to 10th	Night	66% 5% 9% 14% 5%	2340
	11th to 20th	Night	64% 5% 10% 14% 6%	2275
	21st to end	Night	62% 5% 9% 15% 9% 1	1784
March	1st to 10th	Night	52% 7% 10% 20% 11%	1980
	11th to 20th	Night	50% 7% 12% 20% 9% 2	1980
	21st to end	Night	52% 5% 9% 16% 14% 3	2178
April	1st to 10th	Night	52% 7% 9% 18% 14% 1	1859
	11th to 20th	Night	46% 8% 11% 17% 15% 3	1775
	21st to end	Night	47% 6% 12% 21% 11% 3	1634
May	1st to 10th	Night	48% 8% 11% 17% 13% 3	1620
	11th to 20th	Night	46% 8% 11% 18% 15% 2	1576
	21st to end	Night	34% 8% 16% 26% 13% 2	1551
June	1st to 10th	Night	37% 10% 13% 25% 14% 2	1440
	11th to 20th	Night	38% 10% 13% 24% 13% 2	1440
	21st to end	Night	37% 10% 13% 23% 16% 1	1440
July	1st to 10th	Night	38% 9% 13% 20% 16% 4	1400
	11th to 20th	Night	31% 9% 15% 25% 17% 2	1555
	21st to end	Night	38% 9% 16% 21% 14% 3	1672
August	1st to 10th	Night	34% 9% 15% 25% 16% 1	1600
	11th to 20th	Night	36% 9% 13% 26% 13% 2	1598
	21st to end	Night	34% 10% 14% 24% 14% 4	1903
September	1st to 10th	Night	35% 8% 13% 22% 18% 4	1800
	11th to 20th	Night	30% 7% 14% 27% 21% 1	1930
	21st to end	Night	43% 7% 13% 20% 16% 1	2004
October	1st to 10th	Night	41% 8% 13% 23% 13% 2	2160
	11th to 20th	Night	45% 7% 12% 23% 12% 1	2160
	21st to end	Night	52% 7% 12% 18% 10% 1	2376
November	1st to 10th	Night	42% 6% 12% 21% 15% 4	2270
	11th to 20th	Night	54% 6% 11% 18% 9% 2	2651
	21st to end	Night	55% 7% 11% 20% 6% 1	2660
December	1st to 10th	Night	68% 6% 11% 10% 4	2660
	11th to 20th	Night	65% 6% 11% 15% 3	3288
	21st to end	Night	71% 8% 10% 9% 2	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	34% 26% 24% 11% 4 1	238
	11th to 20th	Day	37% 27% 27% 6% 2 1	249
	21st to end	Day	33% 25% 31% 8% 3	264
February	1st to 10th	Day	38% 23% 36% 2 1	240
	11th to 20th	Day	41% 25% 29% 5%	240
	21st to end	Day	37% 30% 27% 6% 1	247
March	1st to 10th	Day	33% 22% 30% 12% 4	420
	11th to 20th	Day	35% 18% 31% 11% 5% 1	420
	21st to end	Day	34% 20% 27% 15% 4 1	462
April	1st to 10th	Day	30% 22% 25% 15% 6% 1	420
	11th to 20th	Day	25% 21% 28% 13% 9% 3	412
	21st to end	Day	31% 19% 28% 16% 5% 2	420
May	1st to 10th	Day	31% 14% 27% 17% 7% 4	423
	11th to 20th	Day	26% 12% 31% 17% 10% 3	447
	21st to end	Day	18% 10% 25% 24% 16% 6%	485
June	1st to 10th	Day	18% 12% 28% 26% 13% 3	450
	11th to 20th	Day	21% 14% 23% 25% 13% 4	450
	21st to end	Day	18% 10% 31% 26% 12% 3	450
July	1st to 10th	Day	16% 4 22% 26% 21% 11%	445
	11th to 20th	Day	11% 7% 28% 30% 16% 8%	444
	21st to end	Day	14% 5% 30% 29% 17% 7%	488
August	1st to 10th	Day	13% 6% 23% 27% 22% 9%	446
	11th to 20th	Day	17% 5% 22% 27% 18% 11%	439
	21st to end	Day	13% 6% 25% 27% 18% 10%	495
September	1st to 10th	Day	18% 8% 23% 26% 17% 8%	450
	11th to 20th	Day	13% 4 23% 31% 20% 10%	450
	21st to end	Day	24% 13% 21% 23% 14% 5%	450
October	1st to 10th	Day	20% 13% 24% 21% 19% 4	450
	11th to 20th	Day	27% 16% 27% 22% 8% 1	450
	21st to end	Day	34% 14% 28% 18% 6%	495
November	1st to 10th	Day	20% 17% 29% 20% 11% 3	403
	11th to 20th	Day	31% 23% 27% 13% 5% 2	183
	21st to end	Day	23% 24% 42% 9% 2	180
December	1st to 10th	Day	32% 29% 25% 9% 3 1	180
	11th to 20th	Day	36% 22% 29% 11% 3	180
	21st to end	Day	41% 19% 27% 10% 4	198
January	1st to 10th	Night	29% 22% 31% 14% 4	760
	11th to 20th	Night	34% 16% 32% 15% 3	736
	21st to end	Night	30% 19% 31% 17% 3	792
February	1st to 10th	Night	34% 16% 29% 19% 2	720
	11th to 20th	Night	30% 21% 34% 13% 2	703
	21st to end	Night	31% 17% 33% 17% 2	592
March	1st to 10th	Night	26% 17% 34% 21% 2	720
	11th to 20th	Night	32% 17% 26% 19% 7%	720
	21st to end	Night	26% 15% 33% 21% 4 1	792
April	1st to 10th	Night	28% 15% 30% 21% 5%	720
	11th to 20th	Night	24% 14% 32% 20% 9% 1	711
	21st to end	Night	20% 12% 34% 28% 6%	554
May	1st to 10th	Night	22% 9% 24% 35% 9% 1	540
	11th to 20th	Night	22% 6% 29% 33% 10%	514
	21st to end	Night	12% 5% 26% 33% 22% 3	389
June	1st to 10th	Night	12% 6% 27% 38% 16% 1	360
	11th to 20th	Night	13% 6% 24% 36% 19% 1	360
	21st to end	Night	12% 3 27% 39% 19% 1	360
July	1st to 10th	Night	11% 2 21% 39% 24% 3	350
	11th to 20th	Night	12% 5% 14% 38% 27% 4	511
	21st to end	Night	13% 2 17% 39% 28% 1	591
August	1st to 10th	Night	9% 3 16% 43% 26% 3	537
	11th to 20th	Night	14% 4 12% 38% 28% 4	534
	21st to end	Night	12% 4 19% 33% 28% 4	715
September	1st to 10th	Night	15% 4 21% 33% 25% 3	720
	11th to 20th	Night	12% 4 19% 34% 27% 4	720
	21st to end	Night	20% 8% 22% 27% 19% 4	720
October	1st to 10th	Night	19% 8% 22% 29% 19% 1	720
	11th to 20th	Night	24% 11% 29% 27% 8% 1	720
	21st to end	Night	30% 14% 25% 25% 6%	792
November	1st to 10th	Night	19% 12% 28% 30% 11%	740
	11th to 20th	Night	28% 14% 28% 23% 6% 1	760
	21st to end	Night	28% 15% 31% 20% 6%	760
December	1st to 10th	Night	34% 19% 26% 17% 4	760
	11th to 20th	Night	30% 21% 28% 18% 3	760
	21st to end	Night	31% 19% 28% 21% 2	836

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