IUP Northpointe Regional Campus
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the IUP Northpointe Regional Campus clear sky chart from 2005-11-06 to 2024-11-12.

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	17% 11% 4 8% 5% 5% 4 4 5% 7% 31%	101252
	Night	17% 11% 4 8% 5% 4 4 3 5% 6% 32%	97869
Transparency	Day	50% 7% 11% 20% 10% 1	104897
	Night	51% 6% 11% 20% 11% 1	102363
Seeing	Day	23% 15% 27% 20% 11% 4	14728
	Night	22% 12% 26% 26% 11% 1	24337

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% 22% 11% 11% 4 3 2 2 3 4 18%	2744
	11th to 20th	Day	13% 22% 8% 17% 8% 3 3 2 3 3 16%	2840
	21st to end	Day	26% 21% 7% 13% 6% 4 3 2 3 4 11%	3124
February	1st to 10th	Day	19% 19% 5% 11% 8% 4 4 3 4 4 20%	1710
	11th to 20th	Day	16% 16% 6% 14% 5% 5% 5% 4 4 6% 21%	1663
	21st to end	Day	21% 14% 4 11% 6% 4 3 3 3 6% 24%	1560
March	1st to 10th	Day	21% 11% 4 9% 4 4 4 3 5% 6% 30%	3435
	11th to 20th	Day	13% 12% 5% 10% 5% 5% 5% 4 4 5% 32%	3480
	21st to end	Day	19% 10% 3 8% 5% 5% 4 3 5% 6% 32%	3815
April	1st to 10th	Day	17% 12% 4 8% 4 5% 5% 3 6% 6% 30%	2212
	11th to 20th	Day	18% 11% 4 7% 6% 4 4 4 4 6% 32%	2263
	21st to end	Day	22% 9% 3 7% 4 4 4 3 4 6% 33%	2470
May	1st to 10th	Day	24% 9% 3 7% 4 4 5% 3 5% 6% 28%	4082
	11th to 20th	Day	19% 8% 3 8% 6% 5% 5% 4 6% 7% 28%	4081
	21st to end	Day	13% 7% 2 6% 4 5% 5% 4 6% 9% 39%	4823
June	1st to 10th	Day	15% 7% 3 6% 6% 6% 5% 4 7% 8% 33%	2660
	11th to 20th	Day	14% 7% 3 7% 5% 5% 5% 5% 7% 8% 34%	2660
	21st to end	Day	14% 7% 2 6% 5% 5% 4 4 6% 9% 37%	2660
July	1st to 10th	Day	10% 6% 2 6% 5% 6% 6% 4 6% 9% 40%	4417
	11th to 20th	Day	10% 7% 2 7% 5% 5% 4 4 7% 10% 40%	4120
	21st to end	Day	11% 7% 3 7% 6% 5% 6% 5% 6% 8% 37%	4466
August	1st to 10th	Day	16% 8% 3 8% 6% 6% 5% 4 7% 7% 30%	4104
	11th to 20th	Day	12% 7% 3 7% 5% 6% 6% 5% 6% 8% 35%	4044
	21st to end	Day	10% 4 3 6% 5% 5% 6% 5% 8% 10% 39%	4286
September	1st to 10th	Day	15% 7% 2 6% 4 3 5% 3 5% 6% 44%	2280
	11th to 20th	Day	11% 7% 2 6% 4 5% 5% 4 6% 8% 44%	2130
	21st to end	Day	21% 8% 3 7% 4 5% 3 4 4 6% 35%	2068
October	1st to 10th	Day	17% 7% 2 7% 4 3 4 4 6% 7% 38%	1900
	11th to 20th	Day	20% 8% 3 6% 5% 5% 4 4 5% 6% 34%	1900
	21st to end	Day	23% 10% 3 7% 4 4 3 3 5% 6% 32%	2090
November	1st to 10th	Day	12% 8% 3 7% 5% 4 3 4 5% 6% 42%	1896
	11th to 20th	Day	19% 14% 3 7% 4 4 4 3 5% 6% 31%	1547
	21st to end	Day	19% 16% 4 8% 5% 4 4 4 5% 5% 24%	1520
December	1st to 10th	Day	21% 20% 7% 11% 6% 5% 3 3 4 5% 17%	1520
	11th to 20th	Day	20% 18% 8% 10% 4 4 4 3 3 5% 21%	1910
	21st to end	Day	25% 23% 7% 11% 5% 3 3 2 3 4 15%	2772
January	1st to 10th	Night	17% 21% 9% 11% 5% 4 4 3 3 4 18%	4199
	11th to 20th	Night	16% 19% 8% 15% 6% 6% 4 3 4 4 15%	4120
	21st to end	Night	29% 17% 7% 11% 5% 3 3 2 3 3 16%	4532
February	1st to 10th	Night	20% 14% 5% 12% 6% 4 4 3 4 4 24%	2470
	11th to 20th	Night	19% 13% 4 12% 5% 5% 4 3 5% 5% 25%	2403
	21st to end	Night	20% 13% 4 11% 6% 5% 4 3 5% 5% 25%	1891
March	1st to 10th	Night	22% 12% 3 6% 4 4 4 3 3 6% 32%	3418
	11th to 20th	Night	18% 13% 6% 7% 4 3 3 3 4 6% 34%	3480
	21st to end	Night	16% 10% 3 7% 5% 3 3 3 4 5% 39%	3817
April	1st to 10th	Night	18% 13% 4 6% 4 4 4 3 3 6% 34%	1967
	11th to 20th	Night	16% 8% 3 7% 4 4 5% 4 5% 7% 37%	1875
	21st to end	Night	15% 9% 3 8% 5% 4 4 3 5% 8% 35%	1716
May	1st to 10th	Night	28% 9% 3 6% 4 4 4 4 5% 6% 29%	2813
	11th to 20th	Night	18% 9% 3 7% 4 4 4 4 5% 7% 34%	2795
	21st to end	Night	13% 6% 2 6% 4 4 5% 3 7% 10% 40%	2732
June	1st to 10th	Night	11% 6% 1 7% 5% 3 4 5% 5% 8% 44%	1520
	11th to 20th	Night	11% 6% 3 7% 3 4 5% 4 6% 9% 42%	1520
	21st to end	Night	11% 5% 2 5% 5% 5% 5% 5% 7% 10% 40%	1520
July	1st to 10th	Night	12% 7% 3 8% 5% 4 4 3 5% 8% 40%	2538
	11th to 20th	Night	11% 5% 2 6% 5% 4 5% 4 7% 9% 43%	2840
	21st to end	Night	11% 7% 3 8% 5% 5% 4 4 6% 7% 40%	3087
August	1st to 10th	Night	15% 7% 3 8% 5% 4 5% 4 6% 7% 36%	2825
	11th to 20th	Night	14% 6% 2 6% 4 5% 4 3 6% 7% 42%	2785
	21st to end	Night	9% 4 2 6% 4 5% 5% 5% 7% 9% 45%	3338
September	1st to 10th	Night	13% 5% 2 4 4 4 4 4 5% 6% 49%	1900
	11th to 20th	Night	9% 4 2 5% 3 3 4 3 6% 8% 52%	2047
	21st to end	Night	17% 8% 3 6% 4 4 5% 3 5% 6% 39%	2110
October	1st to 10th	Night	14% 6% 2 6% 4 4 4 3 5% 7% 44%	2280
	11th to 20th	Night	18% 7% 2 6% 5% 4 4 3 5% 7% 39%	2280
	21st to end	Night	22% 9% 2 6% 4 4 3 3 4 7% 35%	2508
November	1st to 10th	Night	13% 9% 2 6% 4 4 4 4 4 7% 43%	2400
	11th to 20th	Night	18% 12% 3 6% 5% 5% 5% 3 6% 6% 30%	2654
	21st to end	Night	20% 13% 4 7% 5% 4 4 4 4 6% 29%	2660
December	1st to 10th	Night	22% 17% 7% 10% 5% 5% 3 3 4 5% 19%	2660
	11th to 20th	Night	20% 17% 6% 11% 5% 4 4 3 4 5% 22%	3285
	21st to end	Night	25% 18% 6% 10% 6% 5% 4 3 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	72% 4 8% 11% 5%	2745
	11th to 20th	Day	74% 4 7% 11% 3	2840
	21st to end	Day	79% 4 8% 7% 2	3124
February	1st to 10th	Day	68% 4 9% 13% 6%	1710
	11th to 20th	Day	65% 5% 11% 13% 6%	1672
	21st to end	Day	62% 5% 10% 15% 7% 1	1560
March	1st to 10th	Day	54% 7% 10% 23% 6%	3435
	11th to 20th	Day	53% 6% 13% 20% 7% 1	3480
	21st to end	Day	52% 6% 10% 20% 11% 1	3815
April	1st to 10th	Day	53% 6% 10% 18% 11% 2	2212
	11th to 20th	Day	52% 6% 10% 17% 14% 2	2263
	21st to end	Day	52% 5% 10% 20% 11% 1	2470
May	1st to 10th	Day	55% 7% 10% 20% 8% 1	4120
	11th to 20th	Day	52% 8% 12% 19% 8% 1	4085
	21st to end	Day	39% 9% 15% 23% 11% 3	4837
June	1st to 10th	Day	46% 9% 13% 21% 11% 1	2660
	11th to 20th	Day	44% 8% 14% 20% 12% 1	2660
	21st to end	Day	42% 9% 12% 26% 10% 1	2660
July	1st to 10th	Day	41% 8% 12% 23% 14% 2	4347
	11th to 20th	Day	38% 6% 13% 29% 14%	4051
	21st to end	Day	42% 8% 12% 19% 17% 1	4324
August	1st to 10th	Day	51% 8% 13% 20% 8%	4091
	11th to 20th	Day	43% 8% 12% 27% 10% 1	4083
	21st to end	Day	37% 9% 13% 27% 13% 2	4286
September	1st to 10th	Day	41% 7% 10% 22% 17% 3	2280
	11th to 20th	Day	37% 6% 15% 26% 15% 1	2130
	21st to end	Day	49% 6% 11% 20% 13% 1	2068
October	1st to 10th	Day	35% 6% 11% 29% 18% 1	3160
	11th to 20th	Day	43% 6% 11% 22% 13% 4	3140
	21st to end	Day	38% 5% 12% 29% 15% 1	3428
November	1st to 10th	Day	43% 6% 12% 20% 17% 2	1896
	11th to 20th	Day	54% 5% 12% 18% 9% 2	1547
	21st to end	Day	60% 6% 12% 16% 5% 1	1520
December	1st to 10th	Day	71% 6% 10% 10% 3	1520
	11th to 20th	Day	68% 4 11% 15% 3	1906
	21st to end	Day	76% 4 10% 8% 2	2772
January	1st to 10th	Night	70% 5% 9% 13% 3	4199
	11th to 20th	Night	73% 5% 10% 10% 2	4120
	21st to end	Night	75% 4 7% 11% 3 1	4532
February	1st to 10th	Night	64% 4 9% 17% 6%	2470
	11th to 20th	Night	62% 5% 10% 16% 7%	2405
	21st to end	Night	60% 6% 9% 15% 9% 1	1891
March	1st to 10th	Night	55% 4 10% 24% 7%	3418
	11th to 20th	Night	52% 5% 14% 22% 7% 1	3480
	21st to end	Night	46% 6% 11% 22% 14% 1	3817
April	1st to 10th	Night	52% 6% 10% 18% 13% 1	1967
	11th to 20th	Night	46% 7% 12% 17% 15% 3	1875
	21st to end	Night	47% 6% 10% 22% 12% 3	1716
May	1st to 10th	Night	55% 7% 9% 18% 10% 2	2840
	11th to 20th	Night	48% 8% 12% 22% 9% 1	2796
	21st to end	Night	35% 10% 16% 23% 13% 4	2739
June	1st to 10th	Night	36% 9% 14% 25% 15% 2	1520
	11th to 20th	Night	37% 9% 13% 25% 13% 2	1520
	21st to end	Night	37% 9% 14% 23% 16% 1	1520
July	1st to 10th	Night	42% 7% 10% 21% 17% 2	2498
	11th to 20th	Night	35% 8% 15% 25% 16% 1	2786
	21st to end	Night	42% 7% 10% 17% 22% 2	2988
August	1st to 10th	Night	47% 8% 12% 22% 11%	2814
	11th to 20th	Night	41% 7% 9% 30% 12% 1	2812
	21st to end	Night	33% 9% 13% 29% 13% 2	3338
September	1st to 10th	Night	34% 7% 12% 22% 20% 4	1900
	11th to 20th	Night	30% 6% 13% 28% 22% 1	2047
	21st to end	Night	46% 5% 12% 21% 15% 1	2110
October	1st to 10th	Night	36% 5% 9% 26% 22% 1	3800
	11th to 20th	Night	37% 5% 12% 23% 16% 7%	3779
	21st to end	Night	36% 4 12% 27% 19% 1	4120
November	1st to 10th	Night	41% 6% 12% 22% 16% 3	2400
	11th to 20th	Night	54% 5% 11% 19% 10% 2	2654
	21st to end	Night	56% 6% 12% 20% 6% 1	2660
December	1st to 10th	Night	68% 5% 12% 11% 4	2660
	11th to 20th	Night	65% 5% 11% 15% 3	3288
	21st to end	Night	72% 7% 10% 10% 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% 23% 12% 4 1	245
	11th to 20th	Day	38% 26% 27% 6% 2 1	270
	21st to end	Day	34% 23% 33% 8% 3	297
February	1st to 10th	Day	35% 25% 33% 6% 2	270
	11th to 20th	Day	40% 26% 27% 6% 1	270
	21st to end	Day	37% 28% 26% 7% 1	272
March	1st to 10th	Day	32% 22% 28% 14% 3	460
	11th to 20th	Day	34% 20% 29% 12% 4 1	460
	21st to end	Day	33% 19% 27% 16% 3 1	506
April	1st to 10th	Day	30% 20% 26% 16% 6% 1	460
	11th to 20th	Day	26% 20% 29% 14% 9% 3	452
	21st to end	Day	29% 19% 28% 17% 5% 2	460
May	1st to 10th	Day	28% 17% 27% 17% 6% 3	463
	11th to 20th	Day	23% 12% 33% 16% 11% 4	487
	21st to end	Day	16% 10% 27% 27% 16% 5%	529
June	1st to 10th	Day	17% 13% 27% 27% 13% 3	490
	11th to 20th	Day	17% 14% 24% 26% 15% 4	490
	21st to end	Day	17% 12% 31% 26% 11% 3	490
July	1st to 10th	Day	13% 8% 20% 29% 19% 10%	485
	11th to 20th	Day	11% 8% 26% 31% 16% 8%	484
	21st to end	Day	13% 5% 28% 30% 17% 8%	532
August	1st to 10th	Day	13% 8% 24% 25% 21% 10%	486
	11th to 20th	Day	15% 7% 23% 28% 16% 11%	479
	21st to end	Day	12% 6% 24% 27% 21% 10%	539
September	1st to 10th	Day	17% 8% 21% 27% 19% 8%	490
	11th to 20th	Day	11% 4 23% 30% 20% 11%	490
	21st to end	Day	26% 12% 21% 23% 13% 5%	490
October	1st to 10th	Day	18% 11% 27% 22% 19% 4	490
	11th to 20th	Day	25% 16% 27% 21% 9% 3	490
	21st to end	Day	30% 16% 29% 17% 8%	539
November	1st to 10th	Day	20% 18% 30% 20% 10% 3	434
	11th to 20th	Day	31% 19% 30% 13% 5% 2	191
	21st to end	Day	23% 22% 43% 10% 1 1	180
December	1st to 10th	Day	32% 27% 27% 9% 2 2	180
	11th to 20th	Day	34% 23% 28% 12% 3	180
	21st to end	Day	39% 19% 27% 10% 4	198
January	1st to 10th	Night	29% 21% 33% 13% 3	760
	11th to 20th	Night	32% 18% 32% 16% 3	760
	21st to end	Night	31% 19% 31% 17% 3	836
February	1st to 10th	Night	31% 18% 28% 22% 2	760
	11th to 20th	Night	31% 20% 34% 14% 1	743
	21st to end	Night	31% 17% 32% 18% 2	628
March	1st to 10th	Night	26% 18% 32% 21% 3	760
	11th to 20th	Night	29% 18% 26% 20% 6% 1	760
	21st to end	Night	24% 17% 33% 20% 4 1	836
April	1st to 10th	Night	27% 16% 30% 21% 5%	760
	11th to 20th	Night	23% 14% 32% 21% 8% 1	751
	21st to end	Night	20% 11% 32% 31% 6%	576
May	1st to 10th	Night	23% 9% 25% 34% 8% 1	570
	11th to 20th	Night	22% 8% 27% 33% 11%	557
	21st to end	Night	12% 4 25% 35% 22% 3	411
June	1st to 10th	Night	11% 4 29% 40% 14% 1	380
	11th to 20th	Night	11% 7% 24% 37% 20% 1	380
	21st to end	Night	11% 4 29% 36% 19% 1	380
July	1st to 10th	Night	11% 3 19% 41% 23% 3	375
	11th to 20th	Night	12% 4 15% 37% 29% 4	552
	21st to end	Night	13% 3 14% 42% 26% 1	624
August	1st to 10th	Night	9% 3 15% 44% 26% 2	567
	11th to 20th	Night	13% 5% 13% 36% 29% 4	564
	21st to end	Night	11% 3 21% 33% 27% 5%	750
September	1st to 10th	Night	14% 5% 20% 33% 24% 3	760
	11th to 20th	Night	11% 4 17% 36% 28% 4	760
	21st to end	Night	20% 9% 22% 28% 18% 4	760
October	1st to 10th	Night	18% 8% 23% 29% 21% 2	760
	11th to 20th	Night	22% 10% 30% 27% 10% 1	760
	21st to end	Night	25% 15% 25% 27% 7%	836
November	1st to 10th	Night	18% 12% 28% 31% 11%	780
	11th to 20th	Night	27% 15% 28% 22% 7% 1	765
	21st to end	Night	28% 14% 31% 20% 7%	760
December	1st to 10th	Night	34% 19% 27% 16% 4	760
	11th to 20th	Night	29% 20% 28% 19% 3	760
	21st to end	Night	31% 18% 28% 21% 2	836

Page generated at 2024-11-08 22:45:36. Version ac07

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