Catawissa
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Catawissa clear sky chart from 2005-11-06 to 2024-01-12.

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% 7% 3 5% 5% 3 4 5% 5% 7% 43%	74725
	Night	13% 8% 3 5% 5% 3 4 4 5% 6% 44%	75007
Transparency	Day	41% 5% 12% 25% 16% 3	74436
	Night	41% 4 11% 24% 17% 3	74817
Seeing	Day	18% 11% 27% 25% 14% 4	14449
	Night	19% 12% 29% 27% 13% 1	24395

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	11% 11% 6% 8% 6% 3 4 5% 4 6% 37%	1517
	11th to 20th	Day	15% 10% 6% 8% 5% 3 4 4 4 7% 34%	1596
	21st to end	Day	14% 12% 5% 6% 4 2 4 3 4 6% 39%	1782
February	1st to 10th	Day	16% 12% 4 8% 4 3 4 3 5% 5% 35%	1620
	11th to 20th	Day	16% 9% 3 6% 6% 3 5% 5% 5% 6% 37%	1712
	21st to end	Day	16% 10% 4 7% 5% 2 4 3 5% 7% 38%	1480
March	1st to 10th	Day	15% 10% 4 6% 5% 3 4 3 5% 5% 41%	1851
	11th to 20th	Day	20% 10% 3 7% 6% 2 4 3 4 6% 35%	1980
	21st to end	Day	20% 11% 5% 7% 6% 3 4 4 5% 5% 30%	2274
April	1st to 10th	Day	12% 5% 2 6% 5% 3 5% 5% 6% 7% 44%	2160
	11th to 20th	Day	19% 8% 3 5% 4 3 4 4 5% 5% 41%	2134
	21st to end	Day	19% 8% 3 6% 6% 4 4 3 4 7% 36%	2160
May	1st to 10th	Day	18% 7% 3 5% 6% 3 5% 5% 6% 7% 36%	2178
	11th to 20th	Day	17% 6% 2 5% 5% 3 4 5% 6% 8% 41%	2469
	21st to end	Day	10% 5% 2 6% 7% 4 6% 7% 6% 9% 37%	2725
June	1st to 10th	Day	9% 4 2 5% 5% 4 5% 5% 6% 9% 46%	2520
	11th to 20th	Day	9% 4 2 4 4 3 4 5% 6% 10% 50%	2520
	21st to end	Day	5% 3 2 4 5% 4 5% 7% 7% 11% 48%	2520
July	1st to 10th	Day	9% 4 2 5% 5% 3 5% 6% 7% 10% 44%	2520
	11th to 20th	Day	4 3 2 4 4 3 5% 6% 6% 11% 52%	2520
	21st to end	Day	9% 5% 2 4 5% 3 5% 5% 7% 8% 45%	2570
August	1st to 10th	Day	7% 5% 2 5% 6% 4 5% 7% 7% 9% 44%	2328
	11th to 20th	Day	10% 4 2 6% 5% 4 5% 6% 7% 9% 41%	2134
	21st to end	Day	9% 4 2 4 4 3 5% 5% 6% 8% 50%	2376
September	1st to 10th	Day	14% 4 2 4 5% 3 3 4 5% 8% 49%	2160
	11th to 20th	Day	11% 5% 2 5% 4 2 4 5% 5% 8% 51%	2152
	21st to end	Day	7% 4 2 4 5% 2 4 5% 5% 7% 55%	1949
October	1st to 10th	Day	10% 4 2 5% 5% 3 3 4 4 6% 54%	1800
	11th to 20th	Day	16% 6% 2 4 4 2 3 3 4 6% 51%	1800
	21st to end	Day	19% 8% 2 3 4 2 3 3 4 5% 47%	1980
November	1st to 10th	Day	12% 5% 2 4 4 2 3 3 4 6% 55%	1682
	11th to 20th	Day	14% 6% 3 4 5% 2 3 3 5% 6% 48%	1710
	21st to end	Day	17% 10% 3 6% 3 2 4 4 3 5% 44%	1625
December	1st to 10th	Day	15% 10% 4 5% 3 3 5% 5% 4 7% 40%	1520
	11th to 20th	Day	13% 12% 4 6% 5% 2 4 3 4 7% 39%	1918
	21st to end	Day	18% 15% 6% 8% 6% 3 4 4 4 5% 27%	2783
January	1st to 10th	Night	14% 9% 5% 7% 5% 3 4 4 4 6% 40%	2648
	11th to 20th	Night	16% 11% 4 8% 5% 3 4 3 4 5% 37%	2389
	21st to end	Night	14% 11% 4 7% 6% 3 4 4 5% 5% 38%	2574
February	1st to 10th	Night	17% 12% 4 7% 5% 3 4 3 5% 5% 35%	2340
	11th to 20th	Night	16% 8% 5% 8% 4 3 4 3 4 5% 41%	2132
	21st to end	Night	17% 10% 4 7% 5% 3 4 3 4 5% 38%	1776
March	1st to 10th	Night	17% 10% 3 5% 5% 3 4 3 3 4 43%	2124
	11th to 20th	Night	19% 9% 3 6% 5% 3 4 4 4 6% 37%	1980
	21st to end	Night	20% 10% 4 7% 5% 3 4 5% 6% 5% 30%	2080
April	1st to 10th	Night	12% 6% 3 5% 4 2 4 5% 5% 6% 48%	1800
	11th to 20th	Night	14% 8% 2 6% 4 3 4 3 5% 7% 44%	1775
	21st to end	Night	20% 7% 3 5% 5% 2 3 4 4 7% 41%	1800
May	1st to 10th	Night	16% 6% 2 5% 3 3 4 5% 4 7% 45%	1781
	11th to 20th	Night	15% 8% 3 4 5% 2 4 4 4 7% 44%	1422
	21st to end	Night	10% 6% 2 4 6% 4 5% 6% 7% 8% 42%	1551
June	1st to 10th	Night	9% 4 2 5% 5% 2 5% 5% 7% 9% 49%	1440
	11th to 20th	Night	6% 4 1 4 4 2 4 3 6% 10% 55%	1440
	21st to end	Night	4 3 2 4 4 3 5% 5% 5% 10% 56%	1440
July	1st to 10th	Night	10% 3 2 4 4 3 4 5% 6% 10% 49%	1440
	11th to 20th	Night	4 3 2 5% 5% 3 4 4 5% 10% 55%	1440
	21st to end	Night	6% 5% 2 4 5% 3 4 5% 5% 11% 50%	1744
August	1st to 10th	Night	7% 3 1 4 4 2 5% 6% 6% 9% 52%	1611
	11th to 20th	Night	6% 4 2 5% 5% 3 5% 4 6% 9% 51%	1767
	21st to end	Night	6% 3 2 4 4 3 4 5% 5% 9% 56%	1980
September	1st to 10th	Night	13% 5% 2 4 4 3 3 4 5% 6% 53%	1800
	11th to 20th	Night	8% 5% 2 4 5% 3 4 4 6% 7% 53%	1800
	21st to end	Night	9% 3 2 4 4 2 5% 4 4 6% 57%	1995
October	1st to 10th	Night	9% 4 2 4 4 2 3 3 4 7% 58%	2160
	11th to 20th	Night	15% 5% 2 4 3 2 3 4 5% 7% 52%	2160
	21st to end	Night	20% 8% 2 4 3 2 3 3 3 5% 48%	2376
November	1st to 10th	Night	10% 6% 2 4 4 2 3 4 4 5% 57%	2396
	11th to 20th	Night	15% 6% 3 4 4 2 4 3 4 7% 49%	2470
	21st to end	Night	18% 8% 3 5% 3 2 2 3 4 5% 45%	2553
December	1st to 10th	Night	16% 10% 4 6% 5% 2 4 4 5% 6% 37%	2660
	11th to 20th	Night	17% 10% 4 5% 5% 3 4 3 4 5% 40%	3279
	21st to end	Night	17% 19% 6% 8% 6% 3 4 4 4 5% 24%	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	47% 4 12% 21% 14% 2	1518
	11th to 20th	Day	52% 3 11% 25% 9% 1	1596
	21st to end	Day	47% 3 13% 24% 12% 2	1782
February	1st to 10th	Day	52% 3 10% 23% 11% 1	1620
	11th to 20th	Day	48% 4 10% 20% 13% 4	1722
	21st to end	Day	48% 4 8% 24% 13% 4	1480
March	1st to 10th	Day	46% 4 9% 23% 16% 3	1851
	11th to 20th	Day	53% 3 10% 18% 14% 2	1980
	21st to end	Day	56% 5% 12% 17% 9% 1	2274
April	1st to 10th	Day	39% 4 12% 26% 19% 1	2160
	11th to 20th	Day	45% 4 9% 23% 15% 3	2134
	21st to end	Day	49% 4 10% 23% 13% 1	2160
May	1st to 10th	Day	46% 6% 13% 23% 11% 1	2178
	11th to 20th	Day	41% 6% 13% 24% 15% 2	2473
	21st to end	Day	42% 8% 13% 22% 13% 2	2725
June	1st to 10th	Day	35% 6% 13% 28% 18% 2	2520
	11th to 20th	Day	31% 6% 13% 26% 21% 4	2520
	21st to end	Day	29% 7% 17% 26% 16% 5%	2520
July	1st to 10th	Day	34% 7% 15% 27% 13% 4	2451
	11th to 20th	Day	26% 7% 16% 28% 20% 4	2445
	21st to end	Day	35% 7% 12% 29% 16% 2	2427
August	1st to 10th	Day	35% 7% 14% 27% 16% 1	2314
	11th to 20th	Day	37% 7% 13% 27% 14% 1	2134
	21st to end	Day	31% 6% 13% 25% 19% 5%	2376
September	1st to 10th	Day	34% 5% 10% 29% 18% 4	2160
	11th to 20th	Day	32% 4 8% 27% 25% 2	2152
	21st to end	Day	29% 5% 7% 31% 25% 3	1949
October	1st to 10th	Day	31% 4 10% 26% 25% 4	1800
	11th to 20th	Day	36% 3 9% 25% 22% 6%	1800
	21st to end	Day	42% 3 9% 26% 17% 4	1980
November	1st to 10th	Day	32% 3 13% 25% 21% 6%	1682
	11th to 20th	Day	38% 2 9% 25% 22% 5%	1710
	21st to end	Day	45% 3 9% 27% 16%	1625
December	1st to 10th	Day	46% 3 11% 26% 13% 1	1520
	11th to 20th	Day	47% 3 11% 23% 15% 2	1915
	21st to end	Day	60% 3 11% 15% 10% 1	2783
January	1st to 10th	Night	47% 3 9% 23% 16% 1	2648
	11th to 20th	Night	52% 3 8% 24% 11% 1	2389
	21st to end	Night	49% 3 12% 22% 12% 1	2574
February	1st to 10th	Night	52% 4 10% 21% 12% 1	2340
	11th to 20th	Night	47% 3 9% 21% 17% 3	2133
	21st to end	Night	50% 3 9% 22% 13% 3	1776
March	1st to 10th	Night	46% 2 8% 23% 16% 4	2124
	11th to 20th	Night	50% 3 9% 22% 13% 3	1980
	21st to end	Night	56% 5% 11% 19% 9% 1	2080
April	1st to 10th	Night	36% 4 12% 26% 18% 3	1800
	11th to 20th	Night	41% 4 9% 24% 17% 4	1775
	21st to end	Night	45% 3 9% 25% 17% 2	1800
May	1st to 10th	Night	41% 5% 12% 24% 17% 2	1781
	11th to 20th	Night	41% 6% 12% 24% 16% 2	1423
	21st to end	Night	38% 7% 15% 20% 17% 3	1552
June	1st to 10th	Night	31% 5% 15% 29% 17% 3	1440
	11th to 20th	Night	26% 5% 13% 28% 25% 4	1440
	21st to end	Night	24% 5% 15% 31% 18% 7%	1440
July	1st to 10th	Night	32% 4 15% 29% 15% 5%	1400
	11th to 20th	Night	26% 4 15% 30% 22% 4	1392
	21st to end	Night	29% 6% 13% 32% 18% 2	1647
August	1st to 10th	Night	27% 7% 15% 33% 16% 2	1601
	11th to 20th	Night	29% 4 14% 29% 22% 2	1767
	21st to end	Night	26% 6% 13% 27% 23% 5%	1980
September	1st to 10th	Night	34% 4 10% 25% 22% 6%	1800
	11th to 20th	Night	30% 5% 9% 26% 26% 4	1800
	21st to end	Night	29% 4 8% 26% 28% 4	1995
October	1st to 10th	Night	27% 3 11% 26% 28% 5%	2160
	11th to 20th	Night	34% 3 7% 28% 21% 7%	2160
	21st to end	Night	41% 3 9% 22% 22% 4	2376
November	1st to 10th	Night	31% 3 12% 26% 22% 6%	2396
	11th to 20th	Night	38% 3 8% 25% 23% 5%	2470
	21st to end	Night	43% 3 9% 25% 18% 2	2553
December	1st to 10th	Night	48% 3 11% 25% 12% 1	2660
	11th to 20th	Night	48% 3 8% 24% 16% 1	3281
	21st to end	Night	64% 3 10% 14% 7% 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	29% 21% 31% 15% 3 1	270
	11th to 20th	Day	34% 21% 33% 11%	243
	21st to end	Day	23% 30% 33% 11% 2	264
February	1st to 10th	Day	31% 25% 32% 10% 2	240
	11th to 20th	Day	33% 25% 29% 10% 3	240
	21st to end	Day	33% 23% 35% 8% 1	198
March	1st to 10th	Day	24% 23% 44% 8% 2	240
	11th to 20th	Day	37% 18% 30% 11% 3 1	240
	21st to end	Day	36% 18% 31% 12% 3	360
April	1st to 10th	Day	23% 17% 35% 19% 5%	420
	11th to 20th	Day	30% 14% 31% 18% 7% 1	412
	21st to end	Day	26% 16% 34% 18% 5%	420
May	1st to 10th	Day	22% 18% 34% 19% 6% 1	423
	11th to 20th	Day	21% 14% 29% 22% 12% 1	615
	21st to end	Day	13% 10% 32% 26% 13% 6%	679
June	1st to 10th	Day	11% 6% 23% 33% 21% 6%	630
	11th to 20th	Day	10% 6% 24% 40% 17% 5%	630
	21st to end	Day	5% 9% 31% 34% 17% 5%	630
July	1st to 10th	Day	11% 3 15% 30% 29% 11%	621
	11th to 20th	Day	6% 3 25% 38% 23% 5%	618
	21st to end	Day	10% 4 19% 32% 29% 6%	684
August	1st to 10th	Day	9% 3 16% 40% 25% 6%	626
	11th to 20th	Day	13% 3 19% 30% 27% 7%	448
	21st to end	Day	11% 2 18% 27% 33% 10%	495
September	1st to 10th	Day	14% 4 18% 30% 26% 7%	450
	11th to 20th	Day	10% 2 20% 30% 26% 12%	450
	21st to end	Day	10% 8% 23% 32% 21% 6%	419
October	1st to 10th	Day	15% 10% 29% 34% 9% 3	270
	11th to 20th	Day	25% 16% 34% 20% 5%	270
	21st to end	Day	37% 17% 28% 16% 2	297
November	1st to 10th	Day	15% 12% 43% 18% 8% 4	270
	11th to 20th	Day	25% 17% 31% 19% 6% 1	270
	21st to end	Day	29% 14% 34% 17% 6% 1	270
December	1st to 10th	Day	22% 21% 32% 16% 7% 2	270
	11th to 20th	Day	25% 19% 35% 16% 4	270
	21st to end	Day	30% 23% 33% 12% 2	297
January	1st to 10th	Night	21% 21% 34% 20% 4	950
	11th to 20th	Night	24% 21% 34% 17% 3	908
	21st to end	Night	23% 19% 36% 20% 2	990
February	1st to 10th	Night	26% 18% 33% 19% 3	900
	11th to 20th	Night	24% 19% 38% 15% 2	737
	21st to end	Night	26% 20% 33% 19% 2	592
March	1st to 10th	Night	26% 17% 35% 19% 3	684
	11th to 20th	Night	26% 12% 34% 23% 5%	540
	21st to end	Night	26% 14% 35% 21% 4	594
April	1st to 10th	Night	16% 18% 36% 24% 5%	540
	11th to 20th	Night	20% 14% 33% 24% 8%	533
	21st to end	Night	24% 13% 34% 24% 6%	540
May	1st to 10th	Night	18% 11% 33% 31% 7% 1	540
	11th to 20th	Night	19% 5% 29% 32% 14% 1	531
	21st to end	Night	13% 5% 26% 35% 20% 3	584
June	1st to 10th	Night	11% 3 18% 39% 27% 1	540
	11th to 20th	Night	9% 2 25% 44% 20% 1	540
	21st to end	Night	5% 4 25% 43% 21% 2	540
July	1st to 10th	Night	10% 1 11% 38% 33% 6%	525
	11th to 20th	Night	5% 2 17% 43% 30% 2	522
	21st to end	Night	7% 2 15% 41% 32% 3	591
August	1st to 10th	Night	7% 1 12% 42% 34% 3	537
	11th to 20th	Night	8% 3 12% 40% 32% 5%	534
	21st to end	Night	8% 2 14% 36% 36% 4	594
September	1st to 10th	Night	15% 3 14% 34% 29% 5%	540
	11th to 20th	Night	11% 3 15% 35% 30% 6%	540
	21st to end	Night	10% 7% 23% 30% 26% 4	709
October	1st to 10th	Night	10% 7% 28% 30% 21% 4	720
	11th to 20th	Night	18% 13% 31% 25% 11% 1	720
	21st to end	Night	26% 14% 31% 22% 6%	792
November	1st to 10th	Night	14% 12% 37% 27% 10%	740
	11th to 20th	Night	21% 15% 32% 25% 7%	760
	21st to end	Night	24% 15% 33% 23% 5%	843
December	1st to 10th	Night	25% 15% 33% 22% 4 1	950
	11th to 20th	Night	26% 13% 30% 26% 4	950
	21st to end	Night	29% 17% 32% 19% 2	1045

Page generated at 2024-01-09 06:14:42. Version ac07

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