Baxter State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baxter State Park clear sky chart from 2005-11-06 to 2024-08-30.

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	16% 13% 4 10% 6% 5% 5% 4 5% 6% 27%	95639
	Night	15% 13% 5% 11% 7% 5% 5% 3 5% 5% 27%	93451
Transparency	Day	53% 8% 11% 17% 9% 1	95351
	Night	52% 9% 12% 17% 8% 1	93294
Seeing	Day	24% 22% 30% 16% 6% 1	15539
	Night	22% 20% 29% 22% 7%	23685

By Month

Percentage Cloud Cover NE (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	9% 17% 6% 14% 8% 6% 5% 3 4 5% 22%	2397
	11th to 20th	Day	9% 12% 5% 21% 12% 8% 3 3 2 3 23%	2520
	21st to end	Day	9% 12% 6% 18% 8% 7% 5% 4 5% 4 22%	2772
February	1st to 10th	Day	12% 14% 5% 14% 10% 7% 5% 4 5% 5% 18%	1671
	11th to 20th	Day	10% 16% 8% 15% 8% 7% 5% 3 4 3 20%	1743
	21st to end	Day	9% 16% 5% 13% 7% 6% 5% 4 4 4 26%	1570
March	1st to 10th	Day	16% 18% 5% 11% 5% 5% 4 3 4 4 25%	3116
	11th to 20th	Day	12% 25% 9% 13% 6% 4 3 2 3 3 18%	3476
	21st to end	Day	18% 16% 6% 11% 6% 4 3 3 3 5% 26%	3832
April	1st to 10th	Day	17% 18% 5% 11% 6% 4 4 4 4 4 23%	2280
	11th to 20th	Day	17% 17% 4 8% 5% 3 3 4 4 4 31%	2430
	21st to end	Day	20% 15% 5% 8% 4 3 4 3 4 5% 29%	2470
May	1st to 10th	Day	17% 13% 4 8% 6% 5% 5% 4 5% 5% 28%	4106
	11th to 20th	Day	20% 10% 4 8% 5% 5% 6% 4 6% 6% 25%	4194
	21st to end	Day	14% 9% 3 9% 7% 6% 6% 4 7% 7% 27%	5145
June	1st to 10th	Day	23% 13% 3 8% 5% 4 5% 3 6% 6% 24%	2850
	11th to 20th	Day	19% 9% 3 6% 5% 5% 5% 4 6% 7% 31%	2850
	21st to end	Day	23% 11% 3 8% 6% 5% 5% 4 6% 6% 22%	2850
July	1st to 10th	Day	13% 8% 3 8% 7% 7% 6% 5% 7% 7% 27%	4760
	11th to 20th	Day	14% 9% 3 8% 5% 5% 6% 5% 6% 8% 31%	4446
	21st to end	Day	13% 8% 3 8% 6% 5% 5% 4 6% 8% 34%	4814
August	1st to 10th	Day	19% 9% 2 7% 5% 6% 7% 4 6% 8% 28%	2486
	11th to 20th	Day	15% 9% 3 8% 6% 5% 6% 5% 6% 8% 29%	2434
	21st to end	Day	15% 9% 4 7% 4 5% 4 4 6% 7% 35%	2694
September	1st to 10th	Day	14% 8% 3 6% 5% 5% 4 3 5% 7% 39%	2098
	11th to 20th	Day	16% 8% 3 6% 4 4 3 3 4 4 45%	1980
	21st to end	Day	16% 9% 3 7% 4 4 4 4 5% 6% 38%	1980
October	1st to 10th	Day	15% 11% 4 8% 5% 4 5% 3 4 7% 33%	1926
	11th to 20th	Day	19% 13% 4 9% 5% 4 4 4 4 6% 28%	1751
	21st to end	Day	19% 16% 5% 11% 6% 4 3 3 4 6% 23%	1782
November	1st to 10th	Day	18% 17% 3 9% 5% 3 4 3 3 6% 30%	1671
	11th to 20th	Day	14% 14% 6% 13% 6% 4 4 3 4 6% 25%	1607
	21st to end	Day	17% 14% 4 13% 7% 5% 5% 4 5% 6% 21%	1509
December	1st to 10th	Day	18% 18% 6% 15% 7% 4 4 2 4 3 19%	1330
	11th to 20th	Day	17% 18% 7% 12% 5% 5% 4 3 3 4 22%	1668
	21st to end	Day	17% 17% 6% 13% 6% 4 4 3 3 4 24%	2431
January	1st to 10th	Night	10% 14% 7% 17% 13% 6% 5% 3 3 4 18%	4547
	11th to 20th	Night	10% 16% 6% 16% 13% 10% 5% 2 3 3 17%	4440
	21st to end	Night	9% 12% 5% 17% 9% 6% 6% 4 6% 5% 20%	4884
February	1st to 10th	Night	10% 15% 4 12% 8% 8% 7% 4 5% 5% 21%	2508
	11th to 20th	Night	10% 16% 8% 15% 8% 7% 5% 4 5% 5% 19%	2322
	21st to end	Night	12% 14% 4 10% 8% 7% 4 3 5% 5% 28%	1884
March	1st to 10th	Night	17% 17% 6% 11% 6% 4 6% 3 3 4 24%	3724
	11th to 20th	Night	11% 22% 8% 13% 6% 5% 4 4 4 4 18%	3482
	21st to end	Night	20% 16% 5% 10% 6% 4 4 3 4 6% 22%	3799
April	1st to 10th	Night	18% 19% 5% 9% 4 3 4 3 4 5% 27%	1900
	11th to 20th	Night	17% 13% 3 8% 4 4 4 3 6% 6% 33%	1698
	21st to end	Night	20% 14% 4 10% 6% 4 3 3 4 5% 27%	1710
May	1st to 10th	Night	20% 11% 3 7% 4 4 4 4 5% 8% 30%	2834
	11th to 20th	Night	17% 10% 3 10% 6% 6% 6% 4 5% 6% 27%	2727
	21st to end	Night	16% 7% 2 6% 5% 5% 5% 4 6% 9% 36%	2440
June	1st to 10th	Night	23% 11% 3 8% 4 4 4 3 5% 7% 28%	1330
	11th to 20th	Night	16% 9% 4 7% 4 5% 5% 4 5% 7% 34%	1330
	21st to end	Night	18% 12% 5% 8% 4 4 5% 4 5% 6% 30%	1330
July	1st to 10th	Night	11% 9% 3 10% 6% 5% 5% 4 5% 8% 32%	2210
	11th to 20th	Night	15% 8% 4 9% 6% 5% 5% 3 6% 7% 31%	2510
	21st to end	Night	11% 8% 4 8% 6% 5% 5% 4 6% 7% 37%	2739
August	1st to 10th	Night	16% 8% 2 7% 5% 4 4 4 6% 8% 36%	1652
	11th to 20th	Night	13% 9% 3 8% 5% 5% 5% 5% 7% 7% 34%	1686
	21st to end	Night	11% 8% 3 7% 4 4 4 3 5% 6% 46%	1872
September	1st to 10th	Night	13% 7% 2 6% 4 4 4 4 5% 7% 44%	1858
	11th to 20th	Night	15% 9% 3 6% 3 3 3 3 5% 6% 44%	1980
	21st to end	Night	14% 9% 3 8% 5% 3 3 3 5% 7% 40%	1980
October	1st to 10th	Night	17% 8% 3 7% 4 3 4 4 5% 7% 38%	2034
	11th to 20th	Night	17% 13% 3 9% 5% 4 5% 4 4 5% 31%	2204
	21st to end	Night	19% 15% 4 10% 4 5% 5% 3 4 5% 26%	2574
November	1st to 10th	Night	18% 12% 4 10% 5% 5% 5% 4 5% 5% 28%	2407
	11th to 20th	Night	14% 13% 5% 12% 6% 4 4 3 4 5% 29%	2570
	21st to end	Night	14% 13% 5% 13% 8% 6% 4 4 4 6% 22%	2669
December	1st to 10th	Night	19% 16% 6% 13% 8% 6% 6% 3 4 4 16%	2850
	11th to 20th	Night	19% 14% 6% 13% 7% 5% 5% 3 4 4 19%	3531
	21st to end	Night	18% 17% 6% 12% 7% 4 4 2 3 4 24%	5236

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	56% 9% 14% 16% 5%	2398
	11th to 20th	Day	59% 8% 9% 15% 8% 1	2520
	21st to end	Day	60% 8% 8% 12% 12% 1	2772
February	1st to 10th	Day	61% 9% 8% 13% 8% 2	1671
	11th to 20th	Day	60% 9% 9% 12% 9% 1	1751
	21st to end	Day	55% 8% 8% 16% 9% 3	1570
March	1st to 10th	Day	60% 6% 7% 11% 12% 3	3119
	11th to 20th	Day	66% 8% 9% 9% 7% 1	3476
	21st to end	Day	60% 5% 6% 15% 12% 3	3832
April	1st to 10th	Day	61% 6% 9% 13% 9% 2	2280
	11th to 20th	Day	54% 6% 8% 17% 13% 1	2430
	21st to end	Day	57% 4 8% 17% 11% 3	2470
May	1st to 10th	Day	53% 8% 10% 19% 9% 1	4120
	11th to 20th	Day	52% 9% 15% 16% 6% 1	4198
	21st to end	Day	50% 11% 11% 17% 12%	5145
June	1st to 10th	Day	57% 7% 12% 16% 8%	2850
	11th to 20th	Day	49% 8% 12% 19% 10% 2	2850
	21st to end	Day	58% 8% 11% 14% 8%	2850
July	1st to 10th	Day	46% 12% 15% 19% 8%	4685
	11th to 20th	Day	45% 10% 14% 26% 5%	4370
	21st to end	Day	44% 11% 12% 25% 8%	4661
August	1st to 10th	Day	49% 9% 15% 21% 5%	2472
	11th to 20th	Day	47% 10% 15% 20% 8%	2434
	21st to end	Day	44% 9% 14% 23% 10%	2694
September	1st to 10th	Day	41% 9% 14% 23% 13% 1	2098
	11th to 20th	Day	41% 5% 12% 26% 15% 1	1980
	21st to end	Day	43% 8% 10% 25% 13% 1	1980
October	1st to 10th	Day	48% 6% 11% 23% 11%	1926
	11th to 20th	Day	54% 6% 15% 19% 6%	1751
	21st to end	Day	60% 6% 12% 12% 8% 1	1782
November	1st to 10th	Day	55% 6% 12% 17% 9% 1	1671
	11th to 20th	Day	54% 8% 12% 16% 9% 1	1607
	21st to end	Day	56% 10% 15% 14% 4	1509
December	1st to 10th	Day	66% 7% 9% 12% 6% 1	1330
	11th to 20th	Day	59% 7% 9% 12% 11% 1	1668
	21st to end	Day	59% 9% 8% 14% 8% 2	2431
January	1st to 10th	Night	60% 11% 13% 11% 4	4547
	11th to 20th	Night	59% 12% 12% 13% 4 1	4440
	21st to end	Night	56% 10% 10% 14% 9% 2	4884
February	1st to 10th	Night	56% 9% 11% 14% 8% 2	2508
	11th to 20th	Night	60% 10% 9% 12% 8% 1	2325
	21st to end	Night	51% 8% 10% 17% 11% 2	1884
March	1st to 10th	Night	59% 9% 7% 16% 7% 2	3734
	11th to 20th	Night	61% 10% 11% 10% 7% 1	3483
	21st to end	Night	59% 5% 7% 18% 9% 2	3799
April	1st to 10th	Night	56% 6% 7% 15% 13% 3	1900
	11th to 20th	Night	48% 7% 10% 20% 14% 2	1698
	21st to end	Night	57% 6% 7% 16% 11% 3	1710
May	1st to 10th	Night	47% 9% 15% 19% 8% 1	2840
	11th to 20th	Night	52% 10% 13% 18% 6%	2728
	21st to end	Night	40% 11% 16% 21% 12%	2441
June	1st to 10th	Night	55% 6% 12% 19% 8%	1330
	11th to 20th	Night	46% 8% 13% 20% 11% 2	1330
	21st to end	Night	52% 8% 14% 16% 8%	1330
July	1st to 10th	Night	42% 12% 16% 21% 9%	2175
	11th to 20th	Night	43% 10% 15% 26% 5%	2463
	21st to end	Night	38% 13% 17% 24% 8%	2651
August	1st to 10th	Night	43% 9% 18% 26% 4	1642
	11th to 20th	Night	41% 11% 18% 23% 7%	1686
	21st to end	Night	36% 8% 17% 28% 12%	1872
September	1st to 10th	Night	35% 8% 17% 29% 11% 1	1858
	11th to 20th	Night	39% 6% 13% 28% 13% 1	1980
	21st to end	Night	42% 7% 12% 23% 14% 1	1980
October	1st to 10th	Night	43% 7% 11% 26% 13%	2034
	11th to 20th	Night	49% 8% 14% 21% 7%	2204
	21st to end	Night	55% 8% 12% 16% 9%	2574
November	1st to 10th	Night	50% 10% 13% 19% 7% 1	2407
	11th to 20th	Night	51% 8% 14% 16% 10% 1	2570
	21st to end	Night	54% 10% 18% 12% 6%	2669
December	1st to 10th	Night	63% 10% 10% 13% 4	2850
	11th to 20th	Night	58% 10% 10% 13% 10%	3532
	21st to end	Night	57% 8% 10% 14% 8% 1	5236

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% 31% 28% 12%	180
	11th to 20th	Day	31% 33% 27% 7% 2 1	180
	21st to end	Day	20% 29% 38% 10% 4	198
February	1st to 10th	Day	25% 28% 31% 13% 3 1	331
	11th to 20th	Day	28% 32% 28% 9% 2	404
	21st to end	Day	24% 32% 30% 12% 2	382
March	1st to 10th	Day	28% 29% 30% 10% 3	460
	11th to 20th	Day	26% 26% 30% 13% 3 1	460
	21st to end	Day	30% 26% 23% 14% 5% 1	506
April	1st to 10th	Day	34% 26% 22% 12% 5% 1	460
	11th to 20th	Day	33% 27% 24% 12% 4 2	452
	21st to end	Day	30% 25% 31% 10% 3 1	460
May	1st to 10th	Day	31% 21% 31% 13% 3 1	463
	11th to 20th	Day	26% 25% 29% 15% 4 1	487
	21st to end	Day	22% 23% 32% 17% 5%	707
June	1st to 10th	Day	28% 21% 29% 14% 7% 1	680
	11th to 20th	Day	22% 18% 30% 20% 9% 1	680
	21st to end	Day	25% 16% 32% 18% 8% 1	680
July	1st to 10th	Day	17% 18% 33% 21% 10% 1	670
	11th to 20th	Day	17% 17% 39% 18% 9% 1	489
	21st to end	Day	18% 13% 36% 25% 6% 1	532
August	1st to 10th	Day	18% 15% 34% 25% 7% 1	486
	11th to 20th	Day	18% 15% 29% 27% 9% 2	479
	21st to end	Day	19% 18% 29% 21% 11% 2	532
September	1st to 10th	Day	15% 18% 31% 24% 10% 3	450
	11th to 20th	Day	21% 17% 26% 22% 8% 6%	450
	21st to end	Day	19% 21% 29% 16% 10% 5%	450
October	1st to 10th	Day	17% 19% 31% 19% 11% 3	423
	11th to 20th	Day	26% 26% 26% 12% 8% 3	360
	21st to end	Day	27% 27% 27% 15% 4	396
November	1st to 10th	Day	28% 22% 27% 18% 5%	365
	11th to 20th	Day	27% 25% 29% 12% 7% 1	370
	21st to end	Day	32% 25% 26% 13% 3	359
December	1st to 10th	Day	28% 28% 27% 13% 4	180
	11th to 20th	Day	36% 30% 23% 7% 4	180
	21st to end	Day	31% 34% 23% 8% 4	198
January	1st to 10th	Night	20% 27% 34% 17% 3	792
	11th to 20th	Night	24% 27% 29% 17% 3	760
	21st to end	Night	16% 27% 36% 17% 3	836
February	1st to 10th	Night	19% 29% 31% 17% 3	760
	11th to 20th	Night	23% 29% 32% 14% 2	743
	21st to end	Night	21% 26% 34% 16% 2	628
March	1st to 10th	Night	24% 23% 34% 17% 1	760
	11th to 20th	Night	22% 24% 29% 18% 7%	760
	21st to end	Night	22% 23% 29% 20% 6%	836
April	1st to 10th	Night	29% 23% 28% 15% 5%	760
	11th to 20th	Night	23% 23% 27% 20% 6%	574
	21st to end	Night	31% 19% 24% 19% 6%	570
May	1st to 10th	Night	26% 16% 27% 25% 6% 1	570
	11th to 20th	Night	24% 16% 29% 23% 8%	515
	21st to end	Night	21% 11% 34% 26% 8%	411
June	1st to 10th	Night	26% 11% 29% 24% 9%	380
	11th to 20th	Night	19% 13% 23% 33% 12%	380
	21st to end	Night	24% 11% 26% 30% 9%	380
July	1st to 10th	Night	16% 11% 29% 33% 10% 1	370
	11th to 20th	Night	14% 8% 29% 36% 13% 1	368
	21st to end	Night	18% 8% 28% 33% 13%	416
August	1st to 10th	Night	18% 8% 25% 34% 15%	518
	11th to 20th	Night	15% 9% 29% 31% 16% 1	562
	21st to end	Night	15% 8% 27% 34% 15% 1	624
September	1st to 10th	Night	14% 12% 29% 30% 14% 1	707
	11th to 20th	Night	16% 16% 23% 30% 14% 2	720
	21st to end	Night	18% 14% 28% 26% 13% 1	720
October	1st to 10th	Night	20% 14% 27% 26% 12% 1	720
	11th to 20th	Night	23% 17% 28% 22% 9% 1	720
	21st to end	Night	26% 23% 27% 19% 4	792
November	1st to 10th	Night	24% 20% 29% 20% 6%	740
	11th to 20th	Night	21% 26% 26% 18% 8% 1	808
	21st to end	Night	25% 26% 27% 18% 4 1	850
December	1st to 10th	Night	26% 24% 32% 14% 3 1	850
	11th to 20th	Night	27% 25% 28% 17% 4	850
	21st to end	Night	28% 27% 28% 14% 3	935

Page generated at 2024-08-27 09:49:44. Version ac07

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