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 2024-11-25.

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% 11% 4 8% 5% 4 5% 4 5% 7% 31%	101376
	Night	18% 11% 4 8% 5% 4 4 3 5% 6% 32%	98050
Transparency	Day	50% 7% 12% 20% 10% 1	105020
	Night	51% 7% 11% 19% 11% 1	102545
Seeing	Day	24% 15% 27% 20% 11% 4	14752
	Night	23% 12% 26% 26% 11% 1	24374

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	19% 23% 11% 12% 4 3 2 2 3 4 17%	2718
	11th to 20th	Day	13% 23% 8% 17% 8% 4 3 2 3 3 16%	2840
	21st to end	Day	27% 20% 7% 14% 6% 4 4 2 3 3 11%	3124
February	1st to 10th	Day	19% 19% 5% 10% 8% 5% 4 2 3 4 20%	1710
	11th to 20th	Day	17% 15% 6% 13% 5% 5% 5% 3 5% 5% 21%	1663
	21st to end	Day	21% 14% 5% 10% 5% 5% 4 2 5% 6% 23%	1555
March	1st to 10th	Day	20% 11% 5% 8% 5% 4 4 3 5% 6% 30%	3435
	11th to 20th	Day	14% 13% 6% 9% 5% 4 4 3 4 6% 31%	3480
	21st to end	Day	19% 10% 3 8% 5% 5% 4 4 5% 6% 32%	3815
April	1st to 10th	Day	17% 13% 3 7% 5% 5% 5% 4 6% 6% 30%	2218
	11th to 20th	Day	18% 11% 3 7% 5% 5% 5% 3 5% 6% 33%	2257
	21st to end	Day	22% 10% 3 7% 5% 5% 3 3 4 6% 33%	2470
May	1st to 10th	Day	25% 9% 3 7% 4 5% 4 3 5% 6% 29%	4082
	11th to 20th	Day	20% 9% 3 8% 5% 5% 5% 4 6% 7% 29%	4108
	21st to end	Day	13% 7% 2 6% 5% 4 5% 4 7% 9% 39%	4823
June	1st to 10th	Day	15% 7% 3 6% 6% 6% 5% 4 6% 8% 33%	2660
	11th to 20th	Day	14% 8% 3 6% 5% 4 6% 4 7% 9% 34%	2660
	21st to end	Day	15% 6% 2 6% 5% 4 5% 4 7% 10% 36%	2660
July	1st to 10th	Day	10% 7% 2 6% 6% 5% 6% 5% 6% 9% 39%	4440
	11th to 20th	Day	11% 7% 2 6% 5% 5% 5% 3 7% 9% 40%	4128
	21st to end	Day	12% 7% 3 7% 5% 5% 6% 5% 6% 8% 37%	4466
August	1st to 10th	Day	17% 8% 3 8% 5% 6% 6% 5% 6% 7% 29%	4104
	11th to 20th	Day	13% 7% 3 7% 4 6% 6% 4 6% 9% 35%	4044
	21st to end	Day	10% 5% 2 6% 5% 5% 6% 5% 7% 10% 39%	4281
September	1st to 10th	Day	17% 6% 2 6% 4 4 4 3 4 7% 43%	2280
	11th to 20th	Day	12% 6% 2 6% 4 4 4 4 6% 9% 44%	2140
	21st to end	Day	21% 8% 3 6% 4 4 4 4 5% 7% 35%	2063
October	1st to 10th	Day	17% 8% 2 7% 3 4 4 4 6% 8% 38%	1900
	11th to 20th	Day	21% 8% 3 6% 3 4 5% 4 5% 6% 34%	1900
	21st to end	Day	24% 10% 3 6% 4 4 4 3 4 7% 31%	2090
November	1st to 10th	Day	13% 8% 2 7% 5% 4 4 3 5% 7% 41%	1902
	11th to 20th	Day	18% 16% 3 8% 4 4 4 3 5% 6% 30%	1606
	21st to end	Day	19% 17% 4 7% 5% 5% 4 4 5% 5% 24%	1552
December	1st to 10th	Day	21% 20% 7% 11% 6% 4 4 3 4 4 17%	1520
	11th to 20th	Day	19% 19% 7% 12% 4 3 3 3 4 5% 20%	1910
	21st to end	Day	27% 22% 7% 10% 5% 3 3 2 3 4 15%	2772
January	1st to 10th	Night	18% 21% 9% 11% 5% 4 3 3 3 4 18%	4224
	11th to 20th	Night	16% 19% 8% 14% 6% 7% 4 3 4 4 15%	4120
	21st to end	Night	30% 17% 7% 11% 5% 4 2 2 3 3 16%	4532
February	1st to 10th	Night	20% 15% 4 12% 6% 5% 4 3 4 4 24%	2470
	11th to 20th	Night	18% 14% 5% 12% 5% 5% 4 3 4 5% 24%	2403
	21st to end	Night	20% 13% 4 11% 5% 4 4 3 4 6% 25%	1893
March	1st to 10th	Night	23% 12% 3 6% 4 4 3 3 4 6% 32%	3418
	11th to 20th	Night	19% 13% 6% 7% 4 3 3 3 4 6% 33%	3480
	21st to end	Night	17% 10% 3 7% 4 4 3 3 4 5% 40%	3817
April	1st to 10th	Night	19% 13% 3 7% 4 4 5% 3 4 6% 33%	1962
	11th to 20th	Night	17% 8% 3 7% 4 4 4 4 5% 6% 37%	1875
	21st to end	Night	16% 8% 3 6% 5% 5% 5% 3 5% 8% 35%	1724
May	1st to 10th	Night	28% 9% 2 6% 4 4 3 3 5% 6% 29%	2813
	11th to 20th	Night	18% 10% 3 7% 5% 4 4 4 5% 7% 34%	2781
	21st to end	Night	13% 7% 2 6% 4 4 4 4 6% 10% 39%	2732
June	1st to 10th	Night	10% 6% 2 7% 5% 4 5% 4 6% 8% 43%	1520
	11th to 20th	Night	12% 6% 2 6% 4 4 5% 4 5% 10% 42%	1520
	21st to end	Night	12% 6% 2 5% 5% 5% 5% 4 8% 9% 39%	1520
July	1st to 10th	Night	13% 7% 3 8% 5% 4 4 3 5% 8% 40%	2520
	11th to 20th	Night	12% 4 2 6% 4 4 5% 5% 6% 10% 42%	2828
	21st to end	Night	12% 7% 3 9% 5% 4 4 3 6% 7% 40%	3087
August	1st to 10th	Night	15% 8% 3 8% 4 5% 5% 4 6% 7% 36%	2825
	11th to 20th	Night	15% 7% 2 6% 5% 4 5% 3 5% 7% 42%	2785
	21st to end	Night	9% 4 2 6% 4 4 6% 4 7% 9% 45%	3343
September	1st to 10th	Night	13% 6% 2 5% 3 4 4 3 5% 7% 48%	1900
	11th to 20th	Night	9% 4 2 5% 3 3 4 3 5% 9% 51%	2038
	21st to end	Night	18% 8% 3 6% 4 4 3 3 5% 6% 39%	2116
October	1st to 10th	Night	16% 6% 2 5% 4 4 4 4 4 6% 44%	2280
	11th to 20th	Night	18% 8% 3 6% 4 4 4 3 5% 7% 39%	2280
	21st to end	Night	23% 9% 3 6% 3 4 3 3 5% 7% 34%	2508
November	1st to 10th	Night	14% 9% 2 6% 4 4 4 3 5% 6% 43%	2393
	11th to 20th	Night	19% 12% 4 7% 5% 4 4 3 6% 7% 29%	2791
	21st to end	Night	19% 14% 4 7% 5% 4 4 3 6% 6% 28%	2723
December	1st to 10th	Night	22% 19% 7% 9% 5% 4 3 3 4 5% 18%	2660
	11th to 20th	Night	20% 17% 6% 11% 5% 3 4 3 4 5% 22%	3285
	21st to end	Night	24% 19% 6% 10% 6% 5% 4 3 5% 4 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	72% 5% 8% 10% 5%	2719
	11th to 20th	Day	74% 4 8% 11% 3	2840
	21st to end	Day	79% 5% 7% 7% 2	3124
February	1st to 10th	Day	69% 4 8% 12% 6%	1710
	11th to 20th	Day	65% 6% 10% 13% 6%	1672
	21st to end	Day	63% 5% 10% 15% 6% 1	1555
March	1st to 10th	Day	53% 7% 12% 22% 6%	3435
	11th to 20th	Day	52% 8% 15% 18% 6% 1	3480
	21st to end	Day	51% 8% 10% 20% 11% 1	3815
April	1st to 10th	Day	53% 7% 11% 17% 11% 2	2218
	11th to 20th	Day	51% 7% 10% 17% 14% 2	2257
	21st to end	Day	51% 6% 11% 19% 11% 1	2470
May	1st to 10th	Day	54% 9% 10% 19% 7% 1	4120
	11th to 20th	Day	51% 10% 12% 18% 8% 1	4112
	21st to end	Day	38% 11% 15% 22% 12% 3	4837
June	1st to 10th	Day	46% 10% 13% 20% 10% 1	2660
	11th to 20th	Day	44% 9% 14% 20% 12% 1	2660
	21st to end	Day	43% 9% 12% 25% 10% 1	2660
July	1st to 10th	Day	42% 7% 11% 23% 14% 2	4370
	11th to 20th	Day	39% 7% 13% 27% 14%	4058
	21st to end	Day	42% 8% 12% 19% 17% 1	4324
August	1st to 10th	Day	51% 8% 13% 19% 8%	4091
	11th to 20th	Day	42% 8% 13% 26% 10% 1	4083
	21st to end	Day	36% 10% 14% 27% 12% 2	4281
September	1st to 10th	Day	41% 7% 10% 22% 17% 3	2280
	11th to 20th	Day	36% 7% 16% 25% 15% 1	2140
	21st to end	Day	48% 8% 11% 20% 13% 1	2063
October	1st to 10th	Day	36% 6% 11% 29% 18% 1	3160
	11th to 20th	Day	45% 6% 11% 21% 13% 4	3140
	21st to end	Day	39% 5% 12% 29% 15% 1	3428
November	1st to 10th	Day	43% 7% 13% 19% 17% 2	1902
	11th to 20th	Day	54% 7% 11% 18% 8% 2	1606
	21st to end	Day	62% 6% 12% 15% 5% 1	1552
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	70% 6% 9% 12% 3	4224
	11th to 20th	Night	72% 7% 10% 9% 2	4120
	21st to end	Night	74% 5% 7% 11% 3 1	4532
February	1st to 10th	Night	64% 5% 9% 16% 6%	2470
	11th to 20th	Night	62% 6% 10% 15% 6%	2405
	21st to end	Night	61% 5% 10% 15% 9% 1	1893
March	1st to 10th	Night	54% 6% 10% 24% 7%	3418
	11th to 20th	Night	51% 7% 14% 21% 6% 1	3480
	21st to end	Night	45% 7% 11% 21% 14% 1	3817
April	1st to 10th	Night	52% 7% 9% 17% 13% 1	1962
	11th to 20th	Night	46% 8% 11% 17% 15% 3	1875
	21st to end	Night	46% 6% 12% 21% 11% 3	1724
May	1st to 10th	Night	54% 8% 10% 16% 11% 2	2840
	11th to 20th	Night	47% 11% 12% 20% 9% 1	2782
	21st to end	Night	34% 12% 15% 22% 12% 5%	2739
June	1st to 10th	Night	37% 10% 13% 25% 14% 2	1520
	11th to 20th	Night	37% 10% 14% 25% 13% 2	1520
	21st to end	Night	38% 10% 13% 22% 16% 1	1520
July	1st to 10th	Night	43% 7% 11% 20% 17% 2	2480
	11th to 20th	Night	35% 9% 15% 25% 15% 1	2775
	21st to end	Night	43% 7% 11% 16% 21% 2	2988
August	1st to 10th	Night	47% 8% 13% 21% 11%	2814
	11th to 20th	Night	41% 7% 10% 30% 11% 1	2812
	21st to end	Night	33% 10% 14% 29% 13% 2	3343
September	1st to 10th	Night	35% 7% 13% 22% 19% 4	1900
	11th to 20th	Night	30% 7% 13% 27% 22% 1	2038
	21st to end	Night	45% 7% 12% 19% 15% 1	2116
October	1st to 10th	Night	37% 5% 9% 25% 22% 1	3800
	11th to 20th	Night	39% 6% 11% 22% 16% 6%	3779
	21st to end	Night	37% 5% 12% 26% 19% 1	4120
November	1st to 10th	Night	42% 6% 12% 22% 15% 4	2393
	11th to 20th	Night	54% 6% 11% 18% 9% 3	2791
	21st to end	Night	56% 7% 11% 19% 6% 1	2723
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	270
	21st to end	Day	34% 24% 31% 8% 3	297
February	1st to 10th	Day	36% 23% 34% 6% 1	270
	11th to 20th	Day	39% 26% 28% 6% 1	270
	21st to end	Day	38% 28% 27% 6% 1	277
March	1st to 10th	Day	33% 21% 29% 13% 4	460
	11th to 20th	Day	36% 18% 30% 11% 4 1	460
	21st to end	Day	34% 20% 27% 15% 4 1	506
April	1st to 10th	Day	31% 21% 26% 15% 5% 1	460
	11th to 20th	Day	26% 21% 28% 13% 8% 3	452
	21st to end	Day	30% 19% 29% 16% 5% 2	460
May	1st to 10th	Day	31% 14% 27% 18% 7% 3	463
	11th to 20th	Day	25% 13% 30% 17% 11% 4	487
	21st to end	Day	18% 9% 26% 26% 16% 5%	529
June	1st to 10th	Day	18% 13% 27% 25% 13% 3	490
	11th to 20th	Day	19% 13% 24% 26% 14% 4	490
	21st to end	Day	19% 10% 32% 25% 12% 3	490
July	1st to 10th	Day	15% 4 23% 27% 20% 10%	485
	11th to 20th	Day	11% 8% 27% 29% 17% 8%	484
	21st to end	Day	13% 5% 30% 28% 17% 6%	532
August	1st to 10th	Day	15% 7% 23% 26% 20% 8%	486
	11th to 20th	Day	17% 7% 23% 27% 16% 11%	479
	21st to end	Day	12% 6% 24% 29% 19% 10%	539
September	1st to 10th	Day	17% 8% 23% 26% 18% 8%	490
	11th to 20th	Day	12% 4 22% 31% 21% 10%	490
	21st to end	Day	27% 13% 21% 22% 13% 4	490
October	1st to 10th	Day	19% 12% 25% 21% 18% 4	490
	11th to 20th	Day	26% 16% 26% 21% 9% 2	490
	21st to end	Day	31% 14% 29% 18% 7%	539
November	1st to 10th	Day	20% 18% 31% 19% 10% 3	440
	11th to 20th	Day	31% 22% 30% 12% 4 2	203
	21st to end	Day	24% 24% 41% 9% 2	188
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% 18% 31% 15% 3	760
	21st to end	Night	31% 19% 30% 17% 3	836
February	1st to 10th	Night	33% 16% 29% 20% 2	760
	11th to 20th	Night	30% 22% 33% 14% 1	743
	21st to end	Night	31% 17% 32% 18% 2	628
March	1st to 10th	Night	26% 17% 34% 21% 2	760
	11th to 20th	Night	32% 17% 25% 19% 6%	760
	21st to end	Night	26% 16% 34% 20% 4 1	836
April	1st to 10th	Night	28% 15% 30% 21% 5%	760
	11th to 20th	Night	24% 15% 32% 20% 8% 1	751
	21st to end	Night	20% 12% 33% 30% 6%	584
May	1st to 10th	Night	23% 9% 24% 34% 9% 1	570
	11th to 20th	Night	22% 7% 29% 33% 10%	543
	21st to end	Night	11% 5% 25% 34% 22% 3	411
June	1st to 10th	Night	11% 6% 28% 38% 16% 1	380
	11th to 20th	Night	12% 6% 24% 38% 19% 1	380
	21st to end	Night	13% 3 27% 38% 18% 1	380
July	1st to 10th	Night	11% 2 21% 40% 23% 3	370
	11th to 20th	Night	12% 5% 14% 38% 27% 4	541
	21st to end	Night	13% 2 17% 40% 27% 1	624
August	1st to 10th	Night	10% 4 16% 43% 25% 2	567
	11th to 20th	Night	14% 4 12% 38% 28% 4	564
	21st to end	Night	12% 4 18% 34% 28% 4	755
September	1st to 10th	Night	15% 4 21% 33% 24% 3	760
	11th to 20th	Night	11% 4 18% 35% 28% 4	760
	21st to end	Night	21% 9% 22% 27% 18% 4	760
October	1st to 10th	Night	19% 8% 23% 29% 20% 1	760
	11th to 20th	Night	23% 11% 29% 27% 9% 1	760
	21st to end	Night	28% 13% 25% 26% 7%	836
November	1st to 10th	Night	19% 12% 29% 30% 10%	780
	11th to 20th	Night	29% 14% 27% 23% 6% 1	800
	21st to end	Night	29% 15% 31% 20% 6%	779
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

Page generated at 2024-11-22 08:02:23. Version ac07

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