Baxter Conservation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baxter Conservation Area clear sky chart from 2005-11-06 to 2026-02-16.

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% 3 8% 5% 5% 5% 4 5% 6% 31%	131103
	Night	17% 12% 4 9% 5% 5% 4 3 5% 6% 30%	129718
Transparency	Day	51% 7% 12% 20% 10% 1	134568
	Night	53% 6% 11% 18% 10% 1	134340
Seeing	Day	22% 15% 31% 20% 9% 3	16008
	Night	22% 13% 29% 26% 9% 1	25230

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	15% 18% 6% 13% 6% 6% 4 3 4 5% 20%	4661
	11th to 20th	Day	12% 17% 7% 15% 7% 5% 5% 3 4 5% 19%	4650
	21st to end	Day	10% 14% 7% 14% 9% 9% 6% 3 5% 5% 19%	5346
February	1st to 10th	Day	16% 14% 5% 12% 7% 5% 3 4 5% 5% 24%	1890
	11th to 20th	Day	13% 15% 5% 11% 7% 5% 5% 3 5% 5% 27%	1818
	21st to end	Day	20% 14% 5% 10% 6% 4 5% 3 5% 5% 24%	1650
March	1st to 10th	Day	19% 14% 4 10% 6% 5% 5% 3 5% 5% 25%	4476
	11th to 20th	Day	11% 12% 4 9% 6% 5% 6% 4 6% 7% 31%	4969
	21st to end	Day	18% 11% 3 7% 5% 3 4 3 4 5% 38%	5782
April	1st to 10th	Day	21% 12% 3 6% 5% 4 4 3 5% 6% 32%	2400
	11th to 20th	Day	21% 10% 3 7% 5% 4 3 2 4 5% 36%	2374
	21st to end	Day	23% 9% 3 8% 5% 4 4 3 4 5% 32%	2520
May	1st to 10th	Day	24% 11% 4 8% 6% 4 4 4 5% 6% 25%	6346
	11th to 20th	Day	18% 9% 3 9% 6% 5% 5% 4 5% 7% 30%	6318
	21st to end	Day	21% 9% 3 7% 4 4 5% 3 5% 6% 33%	6949
June	1st to 10th	Day	21% 8% 3 7% 5% 5% 4 4 5% 7% 30%	2800
	11th to 20th	Day	15% 5% 2 7% 4 5% 4 6% 6% 8% 38%	2800
	21st to end	Day	20% 7% 3 7% 5% 4 4 4 6% 6% 33%	2800
July	1st to 10th	Day	13% 7% 3 8% 5% 5% 6% 5% 6% 9% 34%	6360
	11th to 20th	Day	11% 5% 2 6% 5% 5% 5% 4 6% 8% 42%	6360
	21st to end	Day	10% 5% 2 5% 4 4 5% 4 7% 10% 44%	6926
August	1st to 10th	Day	15% 8% 3 7% 5% 4 5% 4 5% 7% 37%	4498
	11th to 20th	Day	17% 6% 2 6% 4 4 5% 4 6% 8% 39%	4090
	21st to end	Day	16% 5% 2 6% 4 4 4 4 7% 9% 39%	4312
September	1st to 10th	Day	13% 5% 2 6% 4 5% 4 4 5% 8% 43%	2400
	11th to 20th	Day	13% 5% 2 6% 4 4 4 3 4 7% 49%	2393
	21st to end	Day	19% 5% 2 5% 4 3 5% 4 7% 6% 39%	2146
October	1st to 10th	Day	19% 8% 3 6% 6% 4 4 3 5% 6% 37%	2000
	11th to 20th	Day	20% 9% 4 9% 5% 5% 5% 4 6% 6% 30%	2000
	21st to end	Day	25% 10% 3 6% 4 5% 5% 3 4 5% 28%	2035
November	1st to 10th	Day	17% 9% 3 7% 5% 5% 7% 4 5% 7% 32%	1851
	11th to 20th	Day	17% 14% 4 7% 6% 5% 4 3 5% 5% 29%	1709
	21st to end	Day	21% 15% 4 10% 5% 5% 4 4 5% 6% 21%	1680
December	1st to 10th	Day	20% 21% 4 12% 6% 4 4 4 5% 5% 14%	2680
	11th to 20th	Day	18% 15% 4 12% 6% 5% 4 3 4 4 23%	3066
	21st to end	Day	22% 17% 4 12% 6% 4 5% 4 3 4 21%	4048
January	1st to 10th	Night	14% 19% 8% 14% 5% 5% 4 3 4 4 20%	8234
	11th to 20th	Night	12% 17% 7% 16% 8% 5% 5% 4 4 4 18%	8235
	21st to end	Night	13% 15% 6% 12% 7% 6% 5% 4 5% 5% 23%	8817
February	1st to 10th	Night	14% 15% 6% 12% 6% 6% 5% 4 5% 5% 23%	2730
	11th to 20th	Night	13% 15% 5% 12% 6% 4 5% 3 5% 4 28%	2579
	21st to end	Night	15% 14% 5% 10% 6% 4 4 3 5% 5% 28%	1980
March	1st to 10th	Night	22% 14% 4 9% 5% 4 4 2 4 4 28%	5364
	11th to 20th	Night	14% 12% 4 8% 4 4 4 4 7% 7% 32%	4988
	21st to end	Night	19% 10% 4 8% 5% 5% 4 3 4 5% 35%	5149
April	1st to 10th	Night	20% 11% 4 8% 5% 5% 3 3 4 5% 33%	2000
	11th to 20th	Night	21% 9% 3 6% 5% 4 4 3 4 5% 35%	1975
	21st to end	Night	21% 9% 3 8% 4 4 4 4 4 6% 34%	1894
May	1st to 10th	Night	25% 9% 3 7% 5% 5% 6% 4 5% 6% 24%	3594
	11th to 20th	Night	16% 8% 3 7% 4 4 4 3 5% 7% 37%	3575
	21st to end	Night	18% 9% 3 8% 5% 4 4 4 6% 7% 32%	3926
June	1st to 10th	Night	16% 8% 3 8% 5% 5% 4 5% 6% 8% 32%	1600
	11th to 20th	Night	16% 5% 3 6% 4 4 4 4 6% 8% 41%	1600
	21st to end	Night	19% 7% 3 7% 5% 4 4 3 6% 7% 36%	1600
July	1st to 10th	Night	13% 7% 3 8% 5% 5% 4 4 8% 9% 34%	3600
	11th to 20th	Night	12% 5% 3 7% 4 4 5% 4 5% 8% 44%	3600
	21st to end	Night	9% 6% 2 6% 4 5% 5% 4 6% 7% 46%	3926
August	1st to 10th	Night	12% 7% 3 7% 4 4 5% 4 6% 8% 41%	2647
	11th to 20th	Night	12% 7% 3 7% 4 5% 4 4 5% 7% 41%	2924
	21st to end	Night	11% 6% 3 6% 5% 5% 5% 4 7% 8% 41%	3586
September	1st to 10th	Night	12% 5% 3 7% 4 4 4 3 5% 6% 47%	2000
	11th to 20th	Night	13% 5% 1 5% 3 3 3 3 5% 7% 51%	2006
	21st to end	Night	16% 6% 3 6% 4 4 3 3 4 7% 43%	2250
October	1st to 10th	Night	17% 7% 3 7% 4 4 4 3 5% 7% 40%	2400
	11th to 20th	Night	20% 9% 3 7% 4 4 5% 4 5% 7% 34%	2400
	21st to end	Night	24% 10% 3 7% 5% 4 4 4 5% 6% 28%	2805
November	1st to 10th	Night	20% 10% 3 7% 5% 4 3 3 4 6% 35%	2667
	11th to 20th	Night	17% 12% 3 8% 6% 4 4 3 4 6% 32%	2909
	21st to end	Night	20% 15% 4 9% 5% 5% 4 3 5% 5% 24%	2940
December	1st to 10th	Night	19% 17% 6% 11% 7% 6% 5% 4 4 5% 17%	4720
	11th to 20th	Night	23% 15% 5% 10% 5% 4 4 3 3 4 26%	5348
	21st to end	Night	27% 17% 4 11% 5% 4 3 3 4 4 20%	7150

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	65% 7% 11% 12% 4	4662
	11th to 20th	Day	66% 6% 9% 9% 9% 1	4680
	21st to end	Day	67% 6% 8% 9% 8% 1	5346
February	1st to 10th	Day	62% 5% 9% 19% 5% 1	1890
	11th to 20th	Day	58% 6% 11% 17% 7% 1	1827
	21st to end	Day	62% 6% 10% 13% 8% 1	1650
March	1st to 10th	Day	59% 6% 9% 13% 10% 3	4479
	11th to 20th	Day	50% 8% 17% 15% 9% 1	4969
	21st to end	Day	48% 6% 7% 18% 18% 3	5782
April	1st to 10th	Day	53% 5% 7% 18% 13% 2	2400
	11th to 20th	Day	51% 6% 8% 19% 15% 2	2374
	21st to end	Day	53% 6% 9% 15% 14% 3	2520
May	1st to 10th	Day	58% 8% 9% 17% 7% 2	6357
	11th to 20th	Day	51% 8% 12% 18% 10% 1	6322
	21st to end	Day	49% 7% 12% 21% 10% 1	6949
June	1st to 10th	Day	51% 8% 11% 17% 12% 1	2800
	11th to 20th	Day	42% 8% 12% 24% 12% 2	2800
	21st to end	Day	49% 9% 11% 20% 10% 1	2800
July	1st to 10th	Day	44% 7% 13% 26% 10%	6290
	11th to 20th	Day	37% 8% 13% 28% 14%	6285
	21st to end	Day	34% 7% 13% 36% 9%	6728
August	1st to 10th	Day	46% 6% 15% 24% 9%	4484
	11th to 20th	Day	42% 6% 14% 29% 8% 1	4129
	21st to end	Day	40% 7% 16% 26% 11%	4312
September	1st to 10th	Day	38% 9% 14% 27% 12%	2400
	11th to 20th	Day	35% 6% 13% 32% 14%	2393
	21st to end	Day	42% 8% 14% 25% 10%	2146
October	1st to 10th	Day	45% 5% 11% 30% 9%	3260
	11th to 20th	Day	46% 6% 15% 25% 7% 1	3240
	21st to end	Day	48% 6% 17% 22% 7%	3260
November	1st to 10th	Day	49% 8% 14% 21% 7% 1	1851
	11th to 20th	Day	56% 7% 11% 16% 10% 1	1709
	21st to end	Day	64% 8% 12% 11% 5%	1680
December	1st to 10th	Day	71% 6% 12% 10% 1	2680
	11th to 20th	Day	64% 6% 10% 14% 6%	3066
	21st to end	Day	68% 5% 8% 15% 5%	4048
January	1st to 10th	Night	67% 6% 11% 12% 5% 1	8234
	11th to 20th	Night	68% 7% 8% 10% 7%	8280
	21st to end	Night	63% 5% 7% 13% 11% 1	8817
February	1st to 10th	Night	62% 5% 11% 15% 6% 1	2730
	11th to 20th	Night	58% 6% 11% 19% 7%	2581
	21st to end	Night	58% 6% 9% 18% 9% 1	1980
March	1st to 10th	Night	59% 5% 7% 15% 11% 3	5374
	11th to 20th	Night	48% 7% 19% 16% 7% 3	4989
	21st to end	Night	51% 4 8% 22% 13% 2	5149
April	1st to 10th	Night	53% 5% 9% 19% 12% 2	2000
	11th to 20th	Night	50% 6% 7% 20% 15% 1	1975
	21st to end	Night	51% 5% 9% 16% 15% 3	1894
May	1st to 10th	Night	57% 9% 9% 15% 8% 3	3600
	11th to 20th	Night	43% 9% 14% 19% 14% 1	3576
	21st to end	Night	48% 8% 12% 17% 13% 1	3927
June	1st to 10th	Night	47% 9% 14% 18% 11% 1	1600
	11th to 20th	Night	40% 7% 14% 21% 17% 2	1600
	21st to end	Night	47% 8% 13% 19% 13% 1	1600
July	1st to 10th	Night	43% 7% 16% 20% 13% 1	3560
	11th to 20th	Night	37% 7% 13% 31% 12%	3552
	21st to end	Night	36% 8% 12% 29% 16%	3809
August	1st to 10th	Night	40% 8% 15% 25% 11%	2637
	11th to 20th	Night	41% 6% 16% 29% 8% 1	2951
	21st to end	Night	38% 8% 14% 27% 12% 1	3586
September	1st to 10th	Night	37% 8% 11% 29% 14% 1	2000
	11th to 20th	Night	32% 7% 14% 34% 12% 1	2006
	21st to end	Night	40% 7% 12% 27% 13% 1	2250
October	1st to 10th	Night	40% 6% 13% 29% 11% 1	3920
	11th to 20th	Night	42% 5% 16% 27% 10%	3899
	21st to end	Night	49% 5% 16% 21% 8%	4530
November	1st to 10th	Night	51% 6% 13% 20% 9% 1	2667
	11th to 20th	Night	54% 6% 12% 18% 9% 1	2909
	21st to end	Night	61% 7% 12% 15% 5%	2940
December	1st to 10th	Night	68% 6% 11% 12% 3	4720
	11th to 20th	Night	63% 5% 8% 14% 10% 1	5348
	21st to end	Night	68% 5% 6% 12% 9%	7150

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	23% 19% 35% 20% 4	220
	11th to 20th	Day	30% 18% 35% 11% 5% 1	220
	21st to end	Day	21% 20% 37% 15% 6% 1	283
February	1st to 10th	Day	28% 21% 34% 14% 4	330
	11th to 20th	Day	25% 25% 37% 13%	335
	21st to end	Day	29% 17% 36% 16% 3	414
March	1st to 10th	Day	25% 17% 34% 17% 6%	500
	11th to 20th	Day	23% 20% 34% 19% 4 1	500
	21st to end	Day	28% 20% 29% 15% 6% 2	550
April	1st to 10th	Day	29% 19% 32% 14% 5% 1	500
	11th to 20th	Day	31% 21% 23% 15% 8% 3	492
	21st to end	Day	30% 18% 31% 13% 6% 1	500
May	1st to 10th	Day	25% 15% 31% 20% 7% 2	503
	11th to 20th	Day	17% 18% 35% 18% 9% 3	527
	21st to end	Day	20% 16% 30% 22% 11% 1	573
June	1st to 10th	Day	23% 15% 30% 22% 8% 2	530
	11th to 20th	Day	15% 13% 34% 25% 10% 3	530
	21st to end	Day	22% 13% 34% 20% 9% 3	530
July	1st to 10th	Day	13% 7% 33% 31% 14% 3	525
	11th to 20th	Day	12% 10% 34% 28% 13% 3	524
	21st to end	Day	13% 8% 35% 27% 15% 2	576
August	1st to 10th	Day	14% 9% 26% 33% 15% 4	526
	11th to 20th	Day	17% 6% 24% 30% 17% 7%	519
	21st to end	Day	16% 10% 30% 24% 14% 7%	583
September	1st to 10th	Day	15% 12% 29% 23% 13% 8%	530
	11th to 20th	Day	12% 6% 25% 24% 21% 12%	530
	21st to end	Day	19% 10% 31% 20% 16% 4	530
October	1st to 10th	Day	22% 12% 28% 21% 11% 6%	530
	11th to 20th	Day	24% 19% 27% 23% 6% 1	530
	21st to end	Day	31% 14% 27% 23% 5%	492
November	1st to 10th	Day	28% 19% 28% 18% 6% 1	425
	11th to 20th	Day	24% 21% 36% 12% 5% 2	249
	21st to end	Day	31% 20% 33% 11% 4 1	220
December	1st to 10th	Day	31% 17% 33% 15% 3	220
	11th to 20th	Day	30% 24% 34% 9% 3	220
	21st to end	Day	33% 17% 29% 17% 3 1	242
January	1st to 10th	Night	25% 17% 34% 20% 5%	840
	11th to 20th	Night	28% 18% 27% 21% 5%	840
	21st to end	Night	21% 13% 35% 25% 6%	924
February	1st to 10th	Night	22% 17% 35% 21% 4	840
	11th to 20th	Night	21% 19% 36% 21% 3	804
	21st to end	Night	23% 18% 33% 22% 3	660
March	1st to 10th	Night	26% 14% 34% 22% 4	800
	11th to 20th	Night	22% 21% 31% 21% 5%	800
	21st to end	Night	24% 14% 28% 26% 7%	880
April	1st to 10th	Night	26% 14% 31% 24% 5%	800
	11th to 20th	Night	25% 18% 28% 21% 7%	791
	21st to end	Night	27% 14% 28% 24% 6% 1	694
May	1st to 10th	Night	27% 8% 27% 27% 9% 2	400
	11th to 20th	Night	20% 10% 31% 29% 10%	394
	21st to end	Night	14% 10% 36% 27% 12%	433
June	1st to 10th	Night	17% 7% 32% 35% 8%	400
	11th to 20th	Night	16% 10% 30% 32% 11% 1	400
	21st to end	Night	20% 7% 33% 28% 13% 1	400
July	1st to 10th	Night	8% 8% 27% 45% 11% 1	390
	11th to 20th	Night	14% 4 25% 40% 16% 1	388
	21st to end	Night	10% 3 29% 47% 10% 1	438
August	1st to 10th	Night	14% 4 22% 40% 19%	433
	11th to 20th	Night	14% 3 22% 36% 23% 2	617
	21st to end	Night	15% 6% 28% 32% 18% 2	880
September	1st to 10th	Night	14% 8% 27% 33% 17% 1	800
	11th to 20th	Night	15% 6% 21% 30% 23% 4	800
	21st to end	Night	18% 8% 25% 26% 21% 2	800
October	1st to 10th	Night	20% 10% 29% 24% 15% 2	800
	11th to 20th	Night	23% 14% 30% 26% 7% 1	800
	21st to end	Night	29% 13% 27% 25% 6%	880
November	1st to 10th	Night	28% 15% 27% 23% 8%	820
	11th to 20th	Night	23% 17% 32% 18% 9%	840
	21st to end	Night	29% 17% 27% 21% 6%	840
December	1st to 10th	Night	30% 15% 30% 20% 4	840
	11th to 20th	Night	29% 16% 31% 18% 5% 1	840
	21st to end	Night	34% 15% 28% 19% 3	924

Page generated at 2026-02-13 01:42:14. Version ac07

Copyright © 2026 Attilla Danko.