Upper Gagetown
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Upper Gagetown clear sky chart from 2005-11-06 to 2026-05-17.

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	18% 10% 3 8% 5% 4 4 4 5% 7% 33%	131777
	Night	19% 11% 3 8% 5% 4 4 3 5% 6% 32%	131190
Transparency	Day	50% 5% 12% 21% 11% 1	135293
	Night	52% 5% 11% 21% 11% 1	135763
Seeing	Day	26% 16% 31% 19% 7% 1	18393
	Night	25% 15% 31% 22% 6%	26325

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	11% 19% 5% 12% 5% 5% 4 3 4 5% 27%	4093
	11th to 20th	Day	14% 14% 6% 13% 6% 5% 4 2 4 4 28%	4514
	21st to end	Day	9% 10% 3 8% 5% 4 5% 4 6% 7% 38%	5618
February	1st to 10th	Day	14% 12% 5% 7% 5% 5% 5% 4 6% 6% 31%	1890
	11th to 20th	Day	14% 12% 4 7% 6% 5% 5% 4 5% 6% 31%	1843
	21st to end	Day	10% 11% 3 7% 7% 4 5% 4 5% 6% 37%	1667
March	1st to 10th	Day	23% 11% 4 12% 5% 3 3 3 4 4 27%	4852
	11th to 20th	Day	20% 12% 3 8% 5% 5% 4 4 5% 6% 27%	5090
	21st to end	Day	26% 12% 4 8% 5% 4 4 3 5% 7% 23%	5587
April	1st to 10th	Day	21% 13% 4 6% 4 4 4 4 5% 6% 28%	2454
	11th to 20th	Day	20% 9% 3 7% 4 4 4 3 5% 6% 33%	2702
	21st to end	Day	23% 8% 3 7% 4 4 4 3 5% 5% 34%	2730
May	1st to 10th	Day	25% 11% 3 8% 5% 4 4 4 5% 6% 25%	6016
	11th to 20th	Day	23% 9% 2 7% 4 4 5% 3 5% 6% 31%	6308
	21st to end	Day	20% 9% 3 7% 5% 5% 5% 4 5% 8% 30%	7122
June	1st to 10th	Day	23% 9% 3 8% 5% 5% 5% 4 4 7% 29%	3000
	11th to 20th	Day	21% 7% 3 6% 5% 4 4 4 6% 8% 35%	3000
	21st to end	Day	24% 9% 3 6% 5% 5% 5% 4 5% 7% 28%	3000
July	1st to 10th	Day	16% 8% 2 8% 5% 6% 6% 5% 7% 8% 29%	6820
	11th to 20th	Day	16% 6% 2 6% 4 4 4 4 6% 8% 39%	6820
	21st to end	Day	13% 7% 3 6% 5% 4 5% 5% 6% 8% 38%	6608
August	1st to 10th	Day	19% 8% 3 7% 5% 5% 5% 3 6% 7% 34%	4235
	11th to 20th	Day	14% 7% 3 8% 5% 5% 5% 4 7% 9% 33%	4175
	21st to end	Day	13% 4 2 6% 4 4 5% 3 6% 8% 45%	4675
September	1st to 10th	Day	13% 4 2 5% 4 4 5% 4 6% 9% 45%	2388
	11th to 20th	Day	15% 6% 2 5% 4 3 3 3 5% 6% 49%	2200
	21st to end	Day	17% 7% 2 6% 4 3 4 3 4 5% 45%	2200
October	1st to 10th	Day	16% 7% 3 6% 3 3 4 3 5% 8% 40%	2026
	11th to 20th	Day	19% 8% 3 7% 4 4 4 3 5% 7% 37%	2000
	21st to end	Day	21% 8% 3 8% 5% 5% 5% 3 5% 6% 32%	2085
November	1st to 10th	Day	20% 9% 3 7% 4 5% 4 3 4 6% 35%	1764
	11th to 20th	Day	20% 9% 3 7% 4 5% 4 3 5% 7% 34%	1680
	21st to end	Day	20% 13% 4 9% 5% 4 3 3 4 4 30%	1680
December	1st to 10th	Day	20% 12% 3 8% 4 3 4 3 5% 6% 32%	2690
	11th to 20th	Day	20% 11% 3 9% 6% 3 3 2 4 4 35%	2692
	21st to end	Day	17% 13% 4 8% 4 3 4 3 5% 4 34%	3553
January	1st to 10th	Night	14% 16% 5% 9% 5% 4 4 4 5% 6% 30%	8831
	11th to 20th	Night	19% 14% 4 10% 6% 5% 4 3 5% 6% 25%	8374
	21st to end	Night	8% 13% 3 7% 4 5% 5% 4 6% 8% 38%	8548
February	1st to 10th	Night	14% 13% 4 8% 5% 5% 4 4 5% 6% 32%	2730
	11th to 20th	Night	15% 13% 4 9% 6% 5% 4 3 6% 6% 30%	2663
	21st to end	Night	15% 12% 4 7% 5% 4 4 4 4 4 35%	2137
March	1st to 10th	Night	23% 14% 4 9% 5% 4 5% 2 3 4 25%	5208
	11th to 20th	Night	21% 12% 4 8% 5% 4 5% 3 5% 6% 26%	5089
	21st to end	Night	30% 11% 3 7% 4 3 3 2 5% 4 27%	5587
April	1st to 10th	Night	24% 13% 4 6% 5% 3 4 4 4 5% 28%	2160
	11th to 20th	Night	24% 9% 2 7% 4 4 3 3 5% 6% 32%	1868
	21st to end	Night	23% 9% 2 7% 5% 5% 4 3 5% 6% 31%	1890
May	1st to 10th	Night	26% 11% 3 8% 5% 4 4 3 5% 6% 25%	4144
	11th to 20th	Night	24% 8% 3 6% 4 5% 4 4 5% 5% 32%	3735
	21st to end	Night	18% 10% 3 7% 5% 4 4 3 5% 8% 33%	3816
June	1st to 10th	Night	25% 7% 4 7% 4 4 4 4 5% 7% 29%	1400
	11th to 20th	Night	20% 8% 2 7% 4 5% 4 4 5% 6% 36%	1400
	21st to end	Night	26% 8% 2 6% 5% 5% 4 5% 4 6% 30%	1400
July	1st to 10th	Night	16% 7% 4 9% 5% 6% 6% 4 7% 8% 29%	3160
	11th to 20th	Night	17% 6% 3 8% 5% 5% 5% 4 6% 9% 34%	3160
	21st to end	Night	13% 6% 2 7% 5% 4 6% 4 6% 8% 39%	4194
August	1st to 10th	Night	18% 8% 3 9% 5% 5% 5% 4 6% 7% 30%	2915
	11th to 20th	Night	12% 7% 2 8% 5% 5% 5% 4 7% 9% 36%	2872
	21st to end	Night	14% 4 2 5% 4 4 4 4 6% 7% 46%	3223
September	1st to 10th	Night	16% 6% 2 5% 4 4 4 4 5% 7% 44%	2009
	11th to 20th	Night	16% 6% 2 5% 3 3 3 4 4 7% 47%	2200
	21st to end	Night	18% 6% 2 5% 3 4 4 3 5% 6% 44%	2200
October	1st to 10th	Night	17% 7% 3 6% 4 4 3 3 5% 7% 42%	2373
	11th to 20th	Night	17% 8% 2 7% 4 5% 4 3 5% 6% 38%	2400
	21st to end	Night	22% 9% 3 7% 5% 3 4 3 5% 6% 33%	2751
November	1st to 10th	Night	21% 8% 2 7% 4 4 4 3 4 6% 35%	2752
	11th to 20th	Night	19% 10% 4 7% 5% 4 4 3 5% 6% 33%	2940
	21st to end	Night	22% 12% 4 7% 4 4 3 3 5% 6% 30%	2940
December	1st to 10th	Night	17% 11% 4 8% 5% 4 4 3 5% 6% 32%	4720
	11th to 20th	Night	21% 11% 3 6% 4 4 4 3 4 4 36%	5734
	21st to end	Night	20% 14% 4 9% 4 3 3 3 4 5% 30%	7667

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	60% 3 12% 16% 9%	4094
	11th to 20th	Day	60% 3 11% 16% 8% 1	4544
	21st to end	Day	43% 5% 10% 23% 19% 2	5618
February	1st to 10th	Day	52% 5% 11% 20% 10% 2	1890
	11th to 20th	Day	52% 6% 11% 19% 11% 1	1851
	21st to end	Day	48% 5% 11% 23% 11% 3	1667
March	1st to 10th	Day	62% 3 8% 13% 11% 3	4856
	11th to 20th	Day	57% 6% 13% 15% 7% 2	5090
	21st to end	Day	62% 3 6% 18% 9% 2	5587
April	1st to 10th	Day	56% 5% 9% 15% 13% 2	2454
	11th to 20th	Day	51% 5% 10% 21% 12% 1	2702
	21st to end	Day	52% 4 9% 17% 13% 5%	2730
May	1st to 10th	Day	60% 5% 8% 17% 9% 1	6027
	11th to 20th	Day	53% 6% 11% 21% 6% 2	6312
	21st to end	Day	52% 7% 10% 17% 13%	7122
June	1st to 10th	Day	55% 6% 11% 17% 10% 1	3000
	11th to 20th	Day	48% 5% 12% 21% 13% 2	3000
	21st to end	Day	55% 7% 11% 17% 10% 1	3000
July	1st to 10th	Day	50% 7% 15% 19% 9%	6745
	11th to 20th	Day	42% 6% 15% 27% 10% 1	6739
	21st to end	Day	42% 7% 14% 28% 9%	6420
August	1st to 10th	Day	50% 7% 12% 24% 7%	4222
	11th to 20th	Day	45% 8% 14% 24% 8%	4214
	21st to end	Day	36% 6% 14% 27% 16%	4675
September	1st to 10th	Day	35% 8% 15% 28% 14%	2388
	11th to 20th	Day	37% 6% 10% 27% 17% 2	2200
	21st to end	Day	41% 5% 9% 27% 17% 1	2200
October	1st to 10th	Day	45% 5% 11% 28% 10%	3299
	11th to 20th	Day	45% 4 12% 31% 8%	3240
	21st to end	Day	40% 5% 15% 23% 17%	3348
November	1st to 10th	Day	51% 4 12% 22% 11% 1	1764
	11th to 20th	Day	50% 4 15% 17% 13% 1	1680
	21st to end	Day	58% 5% 12% 18% 6%	1680
December	1st to 10th	Day	53% 3 17% 19% 7%	2690
	11th to 20th	Day	55% 4 8% 19% 10% 4	2692
	21st to end	Day	53% 3 12% 17% 12% 2	3553
January	1st to 10th	Night	55% 4 11% 21% 8% 1	8831
	11th to 20th	Night	61% 4 9% 18% 7% 1	8419
	21st to end	Night	44% 4 10% 23% 17% 3	8548
February	1st to 10th	Night	52% 5% 12% 18% 12% 1	2730
	11th to 20th	Night	54% 5% 11% 17% 11% 2	2666
	21st to end	Night	51% 4 9% 21% 12% 3	2137
March	1st to 10th	Night	64% 3 6% 12% 12% 3	5217
	11th to 20th	Night	57% 7% 15% 13% 8% 1	5090
	21st to end	Night	62% 3 5% 18% 11% 2	5587
April	1st to 10th	Night	58% 4 8% 15% 11% 4	2160
	11th to 20th	Night	52% 4 10% 19% 14% 1	1868
	21st to end	Night	53% 5% 9% 17% 14% 2	1890
May	1st to 10th	Night	59% 5% 10% 16% 9% 1	4150
	11th to 20th	Night	53% 6% 11% 22% 7% 2	3736
	21st to end	Night	48% 9% 15% 20% 8% 1	3817
June	1st to 10th	Night	53% 8% 10% 19% 9% 1	1400
	11th to 20th	Night	48% 6% 13% 22% 10% 2	1400
	21st to end	Night	55% 6% 11% 17% 9% 1	1400
July	1st to 10th	Night	51% 6% 13% 21% 9%	3125
	11th to 20th	Night	47% 6% 14% 26% 7%	3118
	21st to end	Night	42% 7% 14% 26% 10% 1	4069
August	1st to 10th	Night	52% 8% 12% 21% 7%	2903
	11th to 20th	Night	43% 8% 18% 25% 7%	2899
	21st to end	Night	36% 6% 17% 24% 14% 3	3223
September	1st to 10th	Night	39% 6% 11% 29% 14% 1	2009
	11th to 20th	Night	37% 6% 13% 28% 16% 1	2200
	21st to end	Night	41% 5% 10% 28% 15% 1	2200
October	1st to 10th	Night	47% 5% 11% 25% 12%	3880
	11th to 20th	Night	41% 5% 11% 28% 14%	3899
	21st to end	Night	45% 4 15% 22% 13%	4438
November	1st to 10th	Night	50% 5% 12% 22% 10% 1	2752
	11th to 20th	Night	51% 6% 12% 20% 10% 1	2940
	21st to end	Night	55% 6% 13% 16% 9%	2940
December	1st to 10th	Night	52% 4 12% 24% 8%	4720
	11th to 20th	Night	52% 3 10% 20% 13% 1	5735
	21st to end	Night	57% 4 9% 18% 9% 3	7667

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% 19% 35% 15% 2	220
	11th to 20th	Day	37% 20% 29% 10% 4	220
	21st to end	Day	22% 18% 38% 17% 5%	414
February	1st to 10th	Day	27% 16% 34% 18% 5% 1	430
	11th to 20th	Day	26% 23% 32% 14% 3 1	426
	21st to end	Day	25% 23% 33% 16% 3	413
March	1st to 10th	Day	30% 22% 31% 13% 3	540
	11th to 20th	Day	29% 21% 29% 16% 4 1	540
	21st to end	Day	35% 20% 27% 13% 4 1	594
April	1st to 10th	Day	36% 26% 24% 11% 3 1	540
	11th to 20th	Day	32% 21% 30% 12% 4 1	532
	21st to end	Day	31% 18% 29% 15% 7% 1	540
May	1st to 10th	Day	35% 18% 27% 14% 5% 1	543
	11th to 20th	Day	27% 16% 28% 19% 8% 1	712
	21st to end	Day	26% 16% 35% 16% 6% 1	790
June	1st to 10th	Day	28% 17% 28% 20% 6% 1	730
	11th to 20th	Day	28% 13% 30% 21% 8% 1	730
	21st to end	Day	28% 12% 31% 23% 6% 1	730
July	1st to 10th	Day	22% 11% 37% 20% 11%	720
	11th to 20th	Day	19% 8% 33% 28% 10% 2	718
	21st to end	Day	17% 8% 35% 31% 9% 1	596
August	1st to 10th	Day	16% 9% 37% 26% 10% 3	526
	11th to 20th	Day	18% 10% 28% 27% 13% 4	519
	21st to end	Day	18% 12% 28% 26% 13% 4	583
September	1st to 10th	Day	12% 14% 33% 27% 11% 3	530
	11th to 20th	Day	21% 13% 26% 24% 13% 3	530
	21st to end	Day	19% 15% 34% 18% 10% 4	530
October	1st to 10th	Day	23% 14% 22% 26% 13% 2	434
	11th to 20th	Day	23% 20% 27% 18% 10% 1	420
	21st to end	Day	27% 17% 34% 15% 5%	462
November	1st to 10th	Day	32% 17% 31% 14% 5% 1	425
	11th to 20th	Day	34% 19% 27% 15% 4 1	430
	21st to end	Day	30% 24% 29% 13% 3	430
December	1st to 10th	Day	33% 17% 32% 15% 3	430
	11th to 20th	Day	36% 24% 29% 9% 2	224
	21st to end	Day	29% 24% 29% 15% 3	242
January	1st to 10th	Night	27% 20% 30% 19% 3	950
	11th to 20th	Night	28% 17% 28% 22% 5%	865
	21st to end	Night	18% 21% 34% 23% 4	924
February	1st to 10th	Night	24% 19% 31% 22% 4	840
	11th to 20th	Night	24% 23% 31% 18% 3	823
	21st to end	Night	23% 19% 32% 22% 4	692
March	1st to 10th	Night	26% 18% 33% 20% 2	840
	11th to 20th	Night	25% 18% 32% 20% 4	840
	21st to end	Night	28% 15% 34% 18% 4	924
April	1st to 10th	Night	33% 18% 30% 18% 2	731
	11th to 20th	Night	29% 16% 34% 17% 5%	624
	21st to end	Night	28% 15% 31% 21% 5%	630
May	1st to 10th	Night	29% 15% 31% 20% 5%	630
	11th to 20th	Night	29% 14% 33% 20% 4	611
	21st to end	Night	19% 18% 37% 22% 4	595
June	1st to 10th	Night	27% 9% 34% 26% 4	400
	11th to 20th	Night	23% 12% 32% 27% 6%	400
	21st to end	Night	30% 7% 29% 30% 4 1	400
July	1st to 10th	Night	19% 6% 39% 30% 6%	390
	11th to 20th	Night	20% 6% 30% 37% 9%	388
	21st to end	Night	20% 7% 33% 32% 8%	574
August	1st to 10th	Night	17% 6% 34% 33% 10% 1	598
	11th to 20th	Night	17% 6% 30% 35% 12%	592
	21st to end	Night	14% 8% 31% 32% 13% 1	660
September	1st to 10th	Night	17% 9% 38% 25% 10%	614
	11th to 20th	Night	20% 9% 25% 30% 14% 1	800
	21st to end	Night	21% 12% 30% 27% 10%	800
October	1st to 10th	Night	21% 12% 30% 27% 10% 1	800
	11th to 20th	Night	22% 13% 33% 23% 8% 1	800
	21st to end	Night	28% 19% 32% 17% 4	880
November	1st to 10th	Night	30% 15% 30% 19% 5%	865
	11th to 20th	Night	28% 18% 30% 18% 6% 1	950
	21st to end	Night	30% 20% 29% 17% 3 1	950
December	1st to 10th	Night	33% 16% 31% 17% 4	950
	11th to 20th	Night	30% 22% 30% 16% 2	950
	21st to end	Night	30% 19% 29% 18% 4	1045

Page generated at 2026-05-14 02:58:54. Version ac07

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